CN221842003U - Half-wave folded directional microwave detection antenna capable of suppressing frequency deviation - Google Patents

Abstract

The utility model provides a half-wave reverse-turn type directional microwave detection antenna capable of inhibiting frequency offset, which comprises a half-wave oscillator, a reference ground and a conductive inhibitor, wherein the half-wave oscillator is arranged in a state that the distance between two ends of the half-wave oscillator and the reference ground is greater than or equal to lambda/128 and the distance between at least one end of the half-wave oscillator and the reference ground is less than or equal to lambda/6, and the conductive inhibitor is arranged between the half-wave oscillator and the reference ground in a state of being spaced from the half-wave oscillator and is grounded, so that the distribution range of an excitation electric field of the half-wave reverse-turn type directional microwave detection antenna capable of inhibiting frequency offset in the lateral direction of the directional radiation direction is reduced, and the deviation of a working center frequency point of the half-wave reverse-turn type directional microwave detection antenna capable of inhibiting frequency offset when being applied to a product form is inhibited.

Description

Half-wave folded directional microwave detection antenna capable of suppressing frequency deviation

Technical Field

The utility model relates to the field of microwave detection, in particular to a half-wave folded directional microwave detection antenna capable of suppressing frequency deviation.

Background Art

Microwave detection technology works based on the principle of microwave Doppler effect. It can detect the activities of a target space to determine whether there is a human body entering and existing in the target space, so as to detect the active object without infringing the privacy of the person. Therefore, it can be used as an important hub between people and objects, and between objects and objects, and is applied to behavior detection and existence detection, and has a wide range of application prospects. Existing microwave detectors are mainly divided into microwave detectors with columnar radiation source structure and microwave detectors with flat radiation source structure according to the structure of the radiation source. In terms of structure, since the columnar radiation source of the microwave detector with columnar radiation source structure is perpendicular to its reference ground, compared with the microwave detector with flat radiation source structure tending to be a flat structure, the microwave detector with columnar radiation source structure is easy to occupy a larger installation space in actual installation. Therefore, under the current trend of pursuing small and simple appearance aesthetics, the microwave detector with flat radiation source structure is favored due to its advantages of small space occupation and relative stability. However, since the microwave detector with flat radiation source structure has certain size requirements for its flat radiation source, the area of its reference ground also has certain size requirements on the basis of satisfying the structure that is larger than the area of its flat radiation source. Therefore, when there is no need to consider the installation scenario of the space occupied by the microwave detector with the columnar radiation source structure in the direction of its columnar radiation source, the microwave detector with the columnar radiation source structure can occupy a smaller installation space than the microwave detector with the flat plate radiation source structure. However, the microwave detector with the columnar radiation source structure has a larger backward lobe and detection dead zone, which makes it difficult for its actual detection area to match the target space area.

In view of the shortcomings of the existing microwave detectors with a columnar radiation source structure and the microwave detectors with a flat radiation source structure, the applicant has innovatively developed a new antenna with a patent application number of CN202110477994.6 and an invention name of a half-wave folded directional microwave detection antenna. The half-wave folded directional microwave detection antenna can generate directional radiation and has an obvious resonant frequency. Under the same reference ground area condition, the gain of the half-wave folded directional microwave detection antenna in the directional radiation direction can be increased by multiples relative to the microwave detector with a columnar radiation source structure. At the same time, the two ends of the half-wave oscillator of the half-wave folded directional microwave detection antenna can be coupled to each other, which can reduce the energy of direct coupling between the end of the half-wave oscillator and the reference ground, and the area requirement of the reference ground is reduced, thereby realizing the miniaturization of the half-wave folded directional microwave detection antenna and solving the above-mentioned shortcomings of the existing microwave detectors with a columnar radiation source structure and the microwave detectors with a flat radiation source structure.

And the half-wave folded directional microwave detection antenna has a distinct resonant frequency, and has good frequency selection characteristics, and has an extremely narrow frequency width at the resonant frequency, corresponding to the excellent frequency selection characteristics of the half-wave folded directional microwave detection antenna, and strong anti-interference ability. It can resist external electromagnetic radiation interference based on the excellent frequency selection characteristics, and has outstanding performance. However, in the productization process of the half-wave folded directional microwave detection antenna by the applicant, when the half-wave folded directional microwave detection antenna is installed in a product form (such as a lamp, a microwave sensor device), due to the influence of the product housing, lamp board, circuit board, etc., the actual frequency of the existing half-wave folded directional microwave detection antenna will have a significant offset, resulting in instability in the actual working performance.

Specifically refer to Figures 1A and 1B. When the half-wave folded directional microwave detection antenna is independently set in Figure 1A, the center frequency is 5.87 GHz. When the half-wave folded directional microwave detection antenna is installed in the corresponding shell in Figure 1B, the center frequency is offset to 5.82 GHz, which is offset by 50 MHz. The excessive frequency deviation increases the uncertainty of the half-wave folded directional microwave detection antenna in practical applications. When the half-wave folded directional microwave detection antenna is applied to different product forms, its actual performance is more difficult to control.

Utility Model Content

One purpose of the utility model is to provide a half-wave folded type directional microwave detection antenna capable of suppressing frequency deviation, wherein the half-wave folded type directional microwave detection antenna capable of suppressing frequency deviation can address the shortcomings of existing half-wave folded type directional microwave detection antennas, can suppress the deviation of the actual working frequency due to product shells, plates, etc. when applied to product forms, and improve the performance stability of the half-wave folded type directional microwave detection antenna capable of suppressing frequency deviation.

Another object of the present utility model is to provide a half-wave folded directional microwave detection antenna capable of suppressing frequency deviation, wherein when the half-wave folded directional microwave detection antenna capable of suppressing frequency deviation is applied to a product form, the frequency deviation generated by the half-wave folded directional microwave detection antenna is reduced compared to the existing half-wave folded directional microwave detection antenna, which is conducive to enhancing the control of the actual performance of the half-wave folded directional microwave detection antenna capable of suppressing frequency deviation and enhancing the quality control of the actual product.

Another object of the present utility model is to provide a half-wave folded directional microwave detection antenna capable of suppressing frequency deviation, wherein when the half-wave folded directional microwave detection antenna capable of suppressing frequency deviation is applied to a product form, the frequency deviation generated by the half-wave folded directional microwave detection antenna capable of suppressing frequency deviation is reduced compared to the existing half-wave folded directional microwave detection antenna, so that the product quality control of the half-wave folded directional microwave detection antenna capable of suppressing frequency deviation can be guaranteed, which is conducive to ensuring the consistency of the half-wave folded directional microwave detection antenna capable of suppressing frequency deviation in mass production.

Another object of the present utility model is to provide a half-wave folded directional microwave detection antenna capable of suppressing frequency deviation, wherein the half-wave folded directional microwave detection antenna capable of suppressing frequency deviation can suppress frequency deviation while ensuring its normal working performance, thereby helping to ensure the advantages of the half-wave folded directional microwave detection antenna in detection distance and detection sensitivity.

Another object of the present utility model is to provide a half-wave folded directional microwave detection antenna capable of suppressing frequency deviation, wherein the half-wave folded directional microwave detection antenna capable of suppressing frequency deviation comprises a half-wave oscillator, a reference ground and a conductive suppression body, wherein the conductive suppression body is arranged between the half-wave oscillator and the reference ground in a state spaced apart from the half-wave oscillator, and is electrically connected to the reference ground, so as to equivalently raise the reference ground based on the conductive effect of the conductive suppression body, and discharge the excitation electric field energy of the half-wave folded directional microwave detection antenna capable of suppressing frequency deviation in the lateral direction of the directional radiation direction (the direction perpendicular to the reference ground) to the reference ground, thereby By changing the excitation electric field distribution of the half-wave folded directional microwave detection antenna, the excitation electric field distribution range in the lateral direction of the directional radiation direction is reduced. Therefore, when the half-wave folded directional microwave detection antenna capable of suppressing frequency deviation is applied to a product form, the proportion of the electric field lines of the excitation electric field reaching the corresponding shell, plate or mounting surface is reduced, thereby reducing the working frequency of the half-wave folded directional microwave detection antenna capable of suppressing frequency deviation and the displacement of the resonant frequency caused by the influence of the shell, plate or corresponding mounting surface on the excitation electric field of the half-wave folded directional microwave detection antenna, thereby suppressing the frequency deviation of the half-wave folded directional microwave detection antenna capable of suppressing frequency deviation when it is applied to a product form.

Another object of the utility model is to provide a half-wave folded directional microwave detection antenna capable of suppressing frequency deviation, wherein the excitation electric field of the half-wave folded directional microwave detection antenna capable of suppressing frequency deviation in the lateral direction of the directional radiation direction is suppressed by the conductive inhibitor and distributed between the half-wave oscillator and the conductive inhibitor, thereby narrowing the distribution range of the excitation electric field based on the setting of the conductive inhibitor, so as to suppress the frequency deviation of the half-wave folded directional microwave detection antenna capable of suppressing frequency deviation when it is applied to a product form. Taking the 5.8 GHz ISM operating frequency band as an example, the frequency deviation of the half-wave folded directional microwave detection antenna capable of suppressing frequency deviation when it is applied to a product form can be controlled within 30 MHz, which is conducive to ensuring the performance control of the half-wave folded directional microwave detection antenna capable of suppressing frequency deviation when it is applied to a specific product form.

According to one aspect of the utility model, the utility model provides a half-wave folded directional microwave detection antenna capable of suppressing frequency deviation, wherein the half-wave folded directional microwave detection antenna capable of suppressing frequency deviation comprises:

A half-wave oscillator, wherein the half-wave oscillator has an electrical length greater than or equal to 1/2 and less than or equal to 3/4 of the wavelength, wherein the half-wave oscillator is folded back to form a state in which the distance between its two ends is greater than or equal to λ/128 and less than or equal to λ/4, wherein the half-wave oscillator has a feeding point, wherein the distance between the feeding point and one end of the half-wave oscillator is smaller than the distance to the other end, wherein λ is a wavelength parameter corresponding to the frequency of the excitation signal;

A feeder, wherein one end of the feeder is electrically connected to the feed point, so that when the feeder is electrically coupled to the corresponding excitation source at the other end thereof and receives the corresponding excitation signal, the half-wave dipole is fed at the feed point;

a reference ground, wherein the half-wave oscillator is arranged in a state where the distance between its two ends and the reference ground is greater than or equal to λ/128, and the distance between at least one end and the reference ground is less than or equal to λ/6; and

A conductive inhibitor, wherein the conductive inhibitor is arranged between the half-wave oscillator and the reference ground in a state of being spaced apart from the half-wave oscillator and is grounded, thereby reducing the excitation electric field distribution of the half-wave folded directional microwave detection antenna in the lateral direction of the directional radiation direction, thereby suppressing the frequency deviation of the half-wave folded directional microwave detection antenna when it is applied to a product form.

In one embodiment, the conductive inhibitor is provided in the form of a sheet-like conductive layer and is arranged between the half-wave oscillator and the reference ground.

In one embodiment, the conductive inhibitor is provided in the form of a conductive fence and is provided laterally to the half-wave oscillator, wherein a height of the conductive inhibitor is less than or equal to a distance between the half-wave oscillator and the reference ground.

In one embodiment, the direction of the feeding point along the half-wave oscillator is a polarization direction, and the conductive inhibitor disposed in the form of a conductive fence is provided with an opening in the polarization direction.

In one embodiment, one end of the half-wave oscillator close to the feeding point is named the feeding end of the half-wave oscillator, wherein the distance between the feeding end of the half-wave oscillator and the reference ground is less than or equal to the distance between the other end and the reference ground.

In one embodiment, the feeding point is located at the feeding end.

In one embodiment, the feed line has an electrical length greater than or equal to 1/128 and less than or equal to 1/4 wavelength.

In one embodiment, the half-wave folded directional microwave detection antenna further includes a circuit substrate, wherein the reference ground is carried on the circuit substrate, and wherein one end of the feed line connected to the excitation signal is fixed to the circuit substrate.

In one embodiment, the half-wave folded directional microwave detection antenna further includes a grounding wire, wherein the grounding wire extends from the feeding end and is electrically connected to the reference ground so that the half-wave dipole is grounded.

In one embodiment, the half-wave folded directional microwave detection antenna further includes a branch load, wherein the branch load is electrically connected to the half-wave oscillator so as to be loaded on the half-wave oscillator between two ends of the half-wave oscillator.

Through understanding of the following description and drawings, further objects and advantages of the present utility model will be fully reflected.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1A is a schematic diagram of the structure of an existing half-wave folded directional microwave detection antenna and the S11 curve and radiation pattern corresponding to the structure.

FIG1B is a schematic diagram of the structure of an existing half-wave folded directional microwave detection antenna installed in a corresponding housing, and the S11 curve and radiation pattern corresponding to the structure.

FIG. 2A is a schematic structural diagram of a half-wave folded directional microwave detection antenna capable of suppressing frequency deviation according to an embodiment of the present invention.

FIG. 2B is an S11 curve of the half-wave folded directional microwave detection antenna capable of suppressing frequency deviation according to the above embodiment of the present invention.

FIG. 2C is a radiation pattern of the half-wave folded directional microwave detection antenna capable of suppressing frequency deviation according to the above embodiment of the present invention.

FIG. 2D is a two-dimensional radiation pattern of the half-wave folded directional microwave detection antenna capable of suppressing frequency deviation according to the above embodiment of the present invention.

3 is a schematic structural diagram of the half-wave folded directional microwave detection antenna capable of suppressing frequency deviation according to the above embodiment of the present utility model being installed in a corresponding housing, as well as the S11 curve and radiation pattern corresponding to the structure.

FIG. 4A is a schematic diagram of a deformed structure of the half-wave folded directional microwave detection antenna capable of suppressing frequency deviation according to the above embodiment of the present utility model.

FIG. 4B is an S11 curve of the above-mentioned deformed structure of the half-wave folded directional microwave detection antenna capable of suppressing frequency deviation according to the above-mentioned embodiment of the present utility model.

FIG. 4C is a radiation pattern of the above-mentioned deformed structure of the half-wave folded directional microwave detection antenna capable of suppressing frequency deviation according to the above-mentioned embodiment of the present utility model.

FIG. 4D is a two-dimensional radiation pattern of the above-mentioned deformed structure of the half-wave folded directional microwave detection antenna capable of suppressing frequency deviation according to the above-mentioned embodiment of the present utility model.

FIG. 5 is a schematic diagram of a deformed structure of the half-wave folded directional microwave detection antenna capable of suppressing frequency deviation according to the above embodiment of the present utility model.

FIG. 6A is a schematic diagram of a deformed structure of the half-wave folded directional microwave detection antenna capable of suppressing frequency deviation according to the above embodiment of the present utility model.

FIG. 6B is an S11 curve of the above-mentioned deformed structure of the half-wave folded directional microwave detection antenna capable of suppressing frequency deviation according to the above-mentioned embodiment of the present utility model.

FIG. 6C is a radiation pattern of the above-mentioned deformed structure of the half-wave folded directional microwave detection antenna capable of suppressing frequency deviation according to the above-mentioned embodiment of the present utility model.

FIG6D is a two-dimensional radiation pattern of the above-mentioned deformed structure of the half-wave folded directional microwave detection antenna capable of suppressing frequency deviation according to the above-mentioned embodiment of the present utility model.

DETAILED DESCRIPTION

The following description is used to disclose the utility model so that those skilled in the art can implement the utility model. The preferred embodiments described below are only examples, and those skilled in the art can think of other obvious variations. The basic principles of the utility model defined in the following description can be applied to other embodiments, variations, improvements, equivalents, and other technical solutions that do not deviate from the spirit and scope of the utility model.

Those skilled in the art should understand that, in the disclosure of the present invention, the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the above terms should not be understood as limiting the present invention.

It is to be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the element may be multiple, and the term "one" should not be understood as a limitation on the quantity.

The utility model provides a half-wave folded directional microwave detection antenna capable of suppressing frequency deviation. Referring to Figures 2A to 2D of the attached drawings of the specification of the utility model, the structure of the half-wave folded directional microwave detection antenna 10 capable of suppressing frequency deviation according to an embodiment of the utility model and the S11 curve and radiation pattern corresponding to the structure are respectively illustrated. Specifically, the half-wave folded directional microwave detection antenna 10 capable of suppressing frequency deviation is further provided with a conductive suppression body 13 on the basis of the traditional half-wave folded directional microwave detection antenna, corresponding to the conductive suppression body 13 capable of suppressing frequency deviation. A half-wave folded directional microwave detection antenna 10 capable of suppressing frequency deviation comprises a half-wave oscillator 11, a reference ground 12 and the conductive suppressor 13, wherein the half-wave oscillator 11 has an electrical length greater than or equal to 1/2 and less than or equal to 3/4 of the wavelength, wherein the half-wave oscillator 11 is folded back to form a state in which the distance between its two ends is greater than or equal to λ/128 and less than or equal to λ/4, wherein the half-wave oscillator 11 has a feeding point 110, wherein the distance between the feeding point 110 and one end of the half-wave oscillator 11 is smaller than the distance to the other end, In a state where the half-wave oscillator 11 is fed by a corresponding excitation signal at the feeding point 110, the two ends of the half-wave oscillator 11 can form a phase difference tending to be inversely phased and couple with each other, wherein λ is a wavelength parameter corresponding to the frequency of the excitation signal, wherein the half-wave oscillator 11 is arranged in a state where the distance between its two ends and the reference ground 12 is greater than or equal to λ/128, and the distance between at least one end and the reference ground 12 is less than or equal to λ/6, wherein the conductive inhibitor 13 is spaced from the half-wave oscillator 11 by The state is set between the half-wave oscillator 11 and the reference ground 12 and is grounded to equivalently raise the reference ground 12, thereby reducing the excitation electric field distribution of the half-wave folded directional microwave detection antenna 10 capable of suppressing frequency deviation in the lateral direction of the directional radiation direction (the direction perpendicular to the reference ground), so as to suppress the frequency deviation of the half-wave folded directional microwave detection antenna 10 capable of suppressing frequency deviation when it is applied to the product form, that is, to suppress the deviation of the center frequency point of the resonant frequency of the half-wave folded directional microwave detection antenna 10 capable of suppressing frequency deviation.

Specifically in the structure illustrated in the present invention, one end of the half-wave oscillator 11 close to the feeding point 110 is named as the feeding end 111 of the half-wave oscillator 11, wherein the distance between the feeding end 111 of the half-wave oscillator 11 and the reference ground 12 is less than or equal to the distance between the other end and the reference ground 12, and the feeding point 110 is located at the feeding end 111, wherein the half-wave folded directional microwave detection antenna 10 capable of suppressing frequency deviation further includes a feeding line 14, wherein one end of the feeding line 14 is electrically connected to the feeding end 111 of the half-wave oscillator 11, wherein the feeding line 14 has an electrical length greater than or equal to 1/128 and less than or equal to 1/4 wavelength, so as to feed the half-wave oscillator 11 at the feeding end 111 when the feeding line 14 is electrically coupled to the corresponding excitation source at its other end and connected to the excitation signal. The half-wave oscillator 11 is also loaded with a branch load 15, specifically, the branch load 15 is loaded in the middle part of the half-wave oscillator 11, so as to form tuning of the half-wave folded directional microwave detection antenna 10 capable of suppressing frequency deviation based on the branch load 15, so that the resonant frequency of the half-wave folded directional microwave detection antenna 10 can be adjusted to match the corresponding operating frequency.

Further, in this structure of the utility model, the conductive inhibitor 13 is arranged in the form of a conductive fence and is wound around the side of the half-wave oscillator 11. In detail, the half-wave folded directional microwave detection antenna 10 capable of suppressing frequency deviation includes a circuit substrate 16, wherein the half-wave oscillator 11 is mounted on the circuit substrate 16, wherein one end of the feed line 14 connected to the excitation signal is fixed to the circuit substrate 16, on the one hand, it is electrically coupled with the corresponding excitation source to receive the excitation signal, and on the other hand, it forms a support for the half-wave oscillator 11 and mounts the half-wave oscillator 11 on the circuit substrate 16, wherein the reference ground 12 is carried on the side of the circuit substrate 16 facing the half-wave oscillator 11 in the form of a metal conductive layer, and the conductive inhibitor 13 extends upward from the reference ground 12 in the direction of the half-wave oscillator 11 to be wound around the side of the half-wave oscillator 11, and is grounded in a state of being electrically connected to the reference ground 12. Therefore, based on the conductive effect of the conductive inhibitor 13, the reference ground 12 is equivalently raised, and the excitation electric field energy of the half-wave folded directional microwave detection antenna 10 capable of suppressing frequency deviation in the lateral direction of the directional radiation direction is drained back to the reference ground 12, thereby changing the excitation electric field distribution of the half-wave folded directional microwave detection antenna 10, so that the excitation electric field distribution range of the half-wave folded directional microwave detection antenna 10 capable of suppressing frequency deviation in the lateral direction of the directional radiation direction is reduced, so that when the half-wave folded directional microwave detection antenna 10 capable of suppressing frequency deviation is applied to the product form, the proportion of the electric field lines of the excitation electric field reaching the corresponding shell, plate or installation surface is reduced, thereby reducing the working frequency of the half-wave folded directional microwave detection antenna 10 capable of suppressing frequency deviation. The resonance frequency deviation caused by the influence of the shell, plate or corresponding installation surface on the excitation electric field of the half-wave folded directional microwave detection antenna 10 is reduced, so as to suppress the frequency deviation of the half-wave folded directional microwave detection antenna 10 capable of suppressing frequency deviation when it is applied to the product form.

Corresponding to Figure 2B, taking the ISM working frequency band of 5.8 GHz as an example, the center frequency of the half-wave folded directional microwave detection antenna 10 capable of suppressing frequency deviation is approximately 5.97 GHz. Corresponding to Figure 3, when the half-wave folded directional microwave detection antenna 10 capable of suppressing frequency deviation is installed in the corresponding shell, the actual working frequency is approximately 5.94 GHz. That is to say, based on the setting of the conductive inhibitor 13, when the half-wave folded directional microwave detection antenna 10 capable of suppressing frequency deviation works in the working frequency band of 5.8 GHz, the frequency deviation of the half-wave folded directional microwave detection antenna 10 capable of suppressing frequency deviation when applied to a product form can be controlled within 30 MHz, which is conducive to ensuring the performance control of the half-wave folded directional microwave detection antenna 10 capable of suppressing frequency deviation when it is applied to a specific product form.

It is worth mentioning that the half-wave folded directional microwave detection antenna 10 capable of suppressing frequency deviation can suppress the deviation of the actual working frequency due to the product shell, plate, etc. when it is applied to the product form, thereby improving the performance stability of the half-wave folded directional microwave detection antenna 10 capable of suppressing frequency deviation. Therefore, when the half-wave folded directional microwave detection antenna 10 capable of suppressing frequency deviation is applied to the product form, the frequency deviation generated by the existing half-wave folded directional microwave detection antenna is reduced, which is conducive to enhancing the control of the actual performance of the half-wave folded directional microwave detection antenna 10 capable of suppressing frequency deviation and enhancing the quality control of the actual product.

In particular, when the half-wave folded type directional microwave detection antenna 10 capable of suppressing frequency deviation is applied in a product form, the frequency deviation generated by the half-wave folded type directional microwave detection antenna is reduced compared with the existing half-wave folded type directional microwave detection antenna, so that the product quality control of the half-wave folded type directional microwave detection antenna capable of suppressing frequency deviation 10 can be guaranteed, thereby helping to ensure the consistency of the half-wave folded type directional microwave detection antenna capable of suppressing frequency deviation in mass production.

It is worth mentioning that the height of the conductive inhibitor 13 is less than or equal to the distance between the half-wave oscillator 11 and the reference ground 12. That is to say, corresponding to this structure of the present invention, the installation height of the half-wave oscillator 11 is higher than the height of the conductive inhibitor 13, or the lowest position of the half-wave oscillator 11 is at least flush with the highest position of the conductive inhibitor 13, so as to avoid the conductive inhibitor 13 affecting the normal radiation of the half-wave folded directional microwave detection antenna 10 capable of suppressing frequency deviation in the directional radiation direction. Corresponding to Figures 2C and 2D, when the conductive inhibitor 13 is provided, the detection beam of the half-wave folded directional microwave detection antenna 10 capable of suppressing frequency deviation can still tend to be circular, and has a radiation gain of more than 6.3dB in the directional radiation direction. The half-wave folded directional microwave detection antenna 10 capable of suppressing frequency deviation can suppress frequency deviation while ensuring its normal working performance, which is conducive to ensuring the advantages of the half-wave folded directional microwave detection antenna in detection distance and detection sensitivity.

At the same time, the half-wave folded directional microwave detection antenna 10 capable of suppressing frequency deviation still has an obvious resonant frequency while suppressing frequency deviation. The corresponding half-wave folded directional microwave detection antenna 10 capable of suppressing frequency deviation has a high Q value at the operating frequency and has good frequency selection characteristics, that is, the half-wave folded directional microwave detection antenna 10 capable of suppressing frequency deviation still has good selectivity for the received reflected echo, thereby maintaining the advantage of the half-wave folded directional microwave detection antenna in anti-interference performance.

Further, referring to Figures 4A to 4D of the accompanying drawings in the specification of the utility model, a deformed structure of the half-wave folded directional microwave detection antenna 10 capable of suppressing frequency deviation and the S11 curve and radiation pattern corresponding to the deformed structure are respectively illustrated. In this deformed structure, the half-wave folded directional microwave detection antenna 10 capable of suppressing frequency deviation further includes a grounding wire 17 on the basis of the structure shown in Figure 2A, wherein the grounding wire 17 is led out from the feeding end 111 of the half-wave oscillator 11 and is grounded to ground the half-wave oscillator 11, which is conducive to reasonably widening the frequency bandwidth of the half-wave folded directional microwave detection antenna 10 capable of suppressing frequency deviation, thereby improving the production consistency of the half-wave folded directional microwave detection antenna 10 capable of suppressing frequency deviation during mass production based on the widened frequency bandwidth within a reasonable range for different product positioning and market demands.

Specifically, the grounding wire 17 first extends straight from the feeding end 111 and is bent to extend in the direction of the reference ground 12 so as to be electrically connected to the reference ground 12, thereby being grounded in a state of being electrically connected to the reference ground 12, wherein the setting of the grounding wire 17 further forms a support for the half-wave oscillator 11, thereby improving the structural stability of the half-wave folded directional microwave detection antenna 10 capable of suppressing frequency deviation.

In particular, when the half-wave oscillator 11 is in a state where the frequency deviation can be suppressed at the feeding end 111, the working performance of the half-wave folded directional microwave detection antenna 10 capable of suppressing frequency deviation can be guaranteed, the detection beam of the half-wave folded directional microwave detection antenna 10 capable of suppressing frequency deviation can still tend to be circular, and has a radiation gain of more than 6dB in the directional radiation direction, maintaining the advantages of the half-wave folded directional microwave detection antenna in detection distance and detection sensitivity.

Furthermore, in order to ensure that the conductive inhibitor 13 can suppress the frequency deviation of the half-wave folded directional microwave detection antenna 10 capable of suppressing frequency deviation when it is applied in a product form, and further ensure the matching of the installation of various components of the half-wave folded directional microwave detection antenna 10 capable of suppressing frequency deviation in the production process, the conductive inhibitor 13 arranged in the form of a conductive fence is also allowed to be opened with an opening 131. Specifically, the direction of the feeding point 110 along the half-wave oscillator 11 is a polarization direction, and the conductive inhibitor 13 arranged in the form of a conductive fence is opened with the opening 131 in the polarization direction, so that in a specific production process, the conductive inhibitor 13 can be placed on the side of the half-wave oscillator 11 based on the opening 131. Specifically, in the corresponding production process, after the half-wave oscillator 11 is arranged, the conductive inhibitor 13 is arranged on the circuit substrate 16 through the half-wave oscillator 11 based on the setting of the opening 131. It is particularly worth mentioning that, when the half-wave oscillator 11 is loaded with the branch load 15 , the design of the opening 131 on the conductive inhibitor 13 enables the conductive inhibitor 13 to avoid the branch load 15 , thereby ensuring the isolation between the conductive inhibitor 13 and the half-wave oscillator 11 .

Furthermore, for the purpose of improving the structural stability of the half-wave folded directional microwave detection antenna 10 capable of suppressing frequency deviation, the utility model can also form a structural limit on the half-wave oscillator 11 with the help of the conductive inhibitor 13. Specifically, referring to Figure 5 of the accompanying drawings in the specification of the utility model, on the basis of the structure shown in Figure 4A, a deformed structure of the half-wave folded directional microwave detection antenna 10 capable of suppressing frequency deviation is illustrated. In this deformed structure, the conductive inhibitor 13 has a clamping limit portion 132, wherein the grounding wire 17 is clamped by the clamping limit portion 132, so that the half-wave oscillator 11 is limited by the clamping limit portion 132 in the direction toward and/or parallel to the reference ground 12, that is, when the half-wave oscillator 11 tilts left or right, it can be limited based on the clamping of the grounding wire 17 by the clamping limit portion 132, and at the same time, the conductive inhibitor 13 can also be grounded through the grounding wire 17 by the clamping limit portion 132. Therefore, the conductive inhibitor 13 provided in the form of a conductive fence can be grounded by being directly electrically connected to the reference ground 12 or by being grounded via the grounding wire 17. The present invention does not impose any restrictions on this. In the structure corresponding to FIG. 5 , the conductive inhibitor 13 is both directly electrically connected to the reference ground 12 and clamps the grounding wire 17 via the clamping limit portion 132.

A ground-lift limiting hole 133 is provided below the clamping limiting portion 132, wherein the grounding wire 17 first extends straight from the feeding end 111 and is bent to extend in the direction of the reference ground 12, and further extends in the direction of the ground-lift limiting hole 133 and penetrates into the ground-lift limiting hole 133, thereby being limited by the ground-lift limiting hole 133, so that the half-wave oscillator 11 is limited by the ground-lift limiting hole 133 in the direction away from the reference ground 12, thereby improving the structural stability of the half-wave folded directional microwave detection antenna 10 capable of suppressing frequency deviation.

It is understandable that the conductive inhibitor 13 has the requirement of conductivity, and the conductive inhibitor 13 can be implemented as a metal plate or a metal film, or a conductive layer formed on a non-metallic material by electroplating, spraying, doping and other processes, and the present invention is not limited to this.

Based on the purpose of setting the conductive inhibitor 13, in some deformed structures, the conductive inhibitor 13 can also be set in other forms. With specific reference to Figures 6A to 6D of the attached drawings of the specification of the utility model, a deformed structure of the half-wave folded directional microwave detection antenna 10 capable of suppressing frequency deviation and the S11 curve and radiation pattern corresponding to the structure are respectively illustrated. Corresponding to this deformed structure, the conductive inhibitor 13 is set in the form of a sheet-like conductive layer and is set between the half-wave oscillator 11 and the reference ground 12. Specifically, the conductive inhibitor 13 set in the form of a sheet-like conductive layer can be erected between the half-wave oscillator 11 and the reference ground 12 via corresponding support columns, etc., such as being fixed to the circuit substrate 16 by a columnar conductor, etc. and electrically connected to the reference ground 12 via a columnar conductor to be grounded.

Specifically, in this structure of the utility model, the conductive inhibitor 13 provided in the form of a sheet-like conductive layer is electrically connected to the grounding line 17 and is grounded through the grounding line 17, and is supported by the grounding line 17, wherein the conductive inhibitor 13 provided in the form of a sheet-like conductive layer is provided with two isolation holes corresponding to the feeder line 14 and the branch load 15, wherein the feeder line 14 and the branch load 15 pass through the isolation holes and are isolated from the conductive inhibitor 13, thereby based on the grounding conductive layer provided between the half-wave oscillator 11 and the reference ground 12, the reference ground 12 is equivalently raised, so that the directional The excitation electric field energy in the lateral direction of the radiation direction is discharged to the reference ground 12, so that the excitation electric field distribution of the half-wave folded directional microwave detection antenna 10 capable of suppressing frequency deviation in the lateral direction of the directional radiation direction is reduced. In this way, when the half-wave folded directional microwave detection antenna 10 capable of suppressing frequency deviation is applied to a product form, the proportion of the electric field lines of the excitation electric field reaching the corresponding shell or plate is reduced, thereby reducing the influence of the shell or plate on the operating frequency of the half-wave folded directional microwave detection antenna 10 capable of suppressing frequency deviation, thereby achieving the effect of suppressing the frequency deviation of the half-wave folded directional microwave detection antenna 10 capable of suppressing frequency deviation when it is applied to a product form.

And while forming the frequency deviation of the half-wave folded directional microwave detection antenna 10 capable of suppressing frequency deviation when applied to the product form, the performance of the half-wave folded directional microwave detection antenna can also be maintained, wherein the detection beam of the half-wave folded directional microwave detection antenna 10 capable of suppressing frequency deviation can still tend to be circular, and has a radiation gain of more than 6.1dB in the directional radiation direction, and has an obvious resonant frequency point, which is correspondingly conducive to ensuring the advantages of the half-wave folded directional microwave detection antenna in detection distance, detection sensitivity and anti-interference performance.

In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

It should be understood by those skilled in the art that the embodiments of the present invention described above and shown in the accompanying drawings are only examples and do not limit the present invention. The purpose of the present invention has been fully and effectively achieved. The functions and structural principles of the present invention have been demonstrated and explained in the embodiments, and the embodiments of the present invention may be deformed or modified in any way without departing from the principles.

Claims (10)

1. The half-wave reverse-folded directional microwave detection antenna capable of suppressing frequency offset is characterized by comprising:

A half-wave vibrator, wherein the half-wave vibrator has an electrical length of 1/2 or more and 3/4 or less, wherein the half-wave vibrator is folded back to form a state in which a distance between both ends thereof is equal to or greater than λ/128 and equal to or less than λ/4, wherein the half-wave vibrator has a feeding point, wherein the feeding point is spaced from one end of the half-wave vibrator by a distance smaller than the other end, wherein λ is a wavelength parameter corresponding to a frequency of a corresponding excitation signal;

A feeder line, wherein one end of the feeder line is electrically connected to the feeding point, so as to feed the half-wave vibrator at the feeding point when the feeder line is electrically coupled to a corresponding excitation source at the other end thereof to access a corresponding excitation signal;

A reference ground, wherein the half-wave vibrator is provided in a state in which a distance between both ends thereof and the reference ground is equal to or greater than λ/128, and in which a distance between at least one end thereof and the reference ground is equal to or less than λ/6; and

And a conductive suppressing body disposed between the half-wave vibrator and the reference ground in a state of being spaced apart from the half-wave vibrator and grounded.

2. The half-wave folded directional microwave probe antenna capable of suppressing a frequency offset according to claim 1, wherein the conductive suppressing body is provided in a form of a sheet-like conductive layer and is erected between the half-wave vibrator and the reference ground.

3. The half-wave folded directional microwave probe antenna capable of suppressing a frequency offset according to claim 1, wherein the conductive suppressing body is provided in a conductive fence form and is provided laterally to the half-wave vibrator, wherein a height of the conductive suppressing body is equal to or less than a distance between the half-wave vibrator and the reference ground.

4. The half-wave folded directional microwave probe antenna capable of suppressing frequency offset according to claim 2, wherein the conductive suppressing body provided in a form of a conductive fence is opened with an opening in a polarization direction of the feeding point along a direction of the half-wave oscillator.

5. The half-wave folded directional microwave probe antenna capable of suppressing frequency offset according to any one of claims 2 to 4, wherein one end of the half-wave vibrator close to the feed point is named as a feed end of the half-wave vibrator, wherein a distance between the feed end of the half-wave vibrator and the reference ground is equal to or less than a distance between the other end of the half-wave vibrator and the reference ground.

6. The half wave reverse turn type directional microwave probe antenna capable of suppressing frequency offset according to claim 5, wherein the feeding point is located at the feeding end.

7. The half-wave, reverse-turn, directional microwave probe antenna capable of suppressing frequency offset of claim 6, wherein the feed line has a wavelength electrical length of 1/128 or more and 1/4 or less.

8. The half-wave folded directional microwave probe antenna capable of suppressing frequency offset of claim 7, wherein the half-wave folded directional microwave probe antenna further comprises a circuit substrate, wherein the reference ground is carried on the circuit substrate, wherein an end of the feed line that accesses the excitation signal is fixed to the circuit substrate.

9. The half-wave folded directional microwave probe antenna according to claim 8, wherein the half-wave folded directional microwave probe antenna further comprises a ground wire, wherein the ground wire extends from the feed end and is electrically connected to the reference ground, such that the half-wave vibrator is grounded.

10. The half-wave folded directional microwave probe antenna according to claim 8, wherein the half-wave folded directional microwave probe antenna further comprises a stub load, wherein the stub load is electrically connected to the half-wave vibrator to be loaded to the half-wave vibrator between both ends of the half-wave vibrator.