CN204271254U - Quasi-Yagi Patch Antenna Array for L Band - Google Patents

Abstract

The utility model discloses the accurate Yagi spark gap patch antenna array of L-band, comprise the medium substrate of lower surface ground connection, also comprise and be arranged on medium substrate upper surface and about symmetrical between two four antenna elements, the microstrip lines of the barycenter of medium substrate, described antenna element comprises active paster, two reflection pasters, guides paster into; Wherein, microstrip line is connected with active paster respectively, and two reflection pasters are positioned at the same side of active paster, and active paster is at two reflection pasters and guide between paster.The utility model provides one at L-band, and gain is the high-gain aerial of 9.3dB, and this project organization is simple, and be easy to realize, cost is low; Accurate Yagi spark gap patch antenna design scheme is adopted at L-band, the optimal way of associated matrix array antenna, can realize higher than other accurate Yagi spark gap paster antenna gain, the feature more easily regulated, accurate Yagi spark gap patch antenna array uses FR4 sheet material to realize, and has cost low and reduce the features such as area.

Description

Quasi-Yagi Patch Antenna Array for L Band

technical field

The utility model relates to the field of antennas, in particular to a quasi Yagi patch antenna array in the L band.

Background technique

The antenna is an important part of the weathersonde communication system. The function of the antenna is to transmit electromagnetic waves into the air or receive electromagnetic waves from the air. Therefore, the antenna can also be regarded as a signal coupler between the radio frequency transceiver circuit and the air. The quality of the antenna directly affects the performance of the radiosonde equipment. The propagation environment in which the antenna works is relatively complex, and it is sensitive to environmental influences such as temperature and terrain. When electromagnetic waves propagate in the air, they will be hindered by multipath propagation, reflection, and diffraction, etc., which have certain influence on the received signal. Influence. Due to the long transmission distance, a directional high-gain receiving antenna is used in the receiving system, and the main beam of the receiving antenna is required to be aligned with the transmitting end. The receiving antenna of the meteorological radiosonde communication system generally adopts four groups of Yagi arrays or ground wide-beam parabolic antennas.

Yagi antenna is a typical directional antenna, which is widely used in communication, radar and other radio technology equipment. It usually consists of an active element, a reflector and several directors. Properly adjusting the length of the elements and the distance between them can improve the frequency response and radiation characteristics of the antenna. However, the Yagi antenna can only achieve end-fire radiation, and it cannot be installed coplanarly with the surface of the carrier. However, in the practical application of wireless communication, it is often required that the main lobe beam of the antenna is between the side-fire direction and the end-fire direction, that is, quasi-end The radiation direction, and the antenna and the carrier are installed in the same plane. Based on the advantages of thin microstrip antenna profile, small size, easy surface commonality of missiles, satellites and other carriers, and the ability to achieve quasi-end fire, John Huang et al. used microstrip patch Yagi antennas to achieve the above requirements.

In 1989, John Huang proposed the microstrip patch Yagi antenna, which printed a reflective patch, an active patch and two guide patches, a total of 4 square metal patches on the front of a dielectric board, and the back of the dielectric board It is a metal grounding plate, fed by coaxial line. The working principle of the antenna is similar to that of the Yagi vibrator antenna. The size of the patch is very close but decreases successively. After software simulation and made into a real object, the test results show that this antenna is at an elevation angle of 20°~ In the range of 60°, the gain is significantly higher than that of ordinary microstrip antennas, and the impedance bandwidth is slightly wider than that of a single patch, with a quasi-end-fire pattern. In 1991, John Huang arranged four microstrip patch Yagi antennas in parallel arrays to increase the gain, and applied them to the US MSAT system. In 2007, Gerald R. DeJean improved the structure proposed by John Huang. By increasing the number of guide patches and using microstrip line feeding, the antenna gain and front-to-back lobe ratio (F/B) were improved, but Relatively small bandwidth.

Contents of the invention

The technical problem to be solved by this utility model is to overcome the deficiencies of the prior art and provide the quasi Yagi patch antenna array of the L band. The utility model adopts the array mode and adopts the microstrip patch Yagi antenna as the The antenna unit has high gain, simple structure and low cost.

The utility model adopts the following technical solutions for solving the above-mentioned technical problems:

According to the L-band quasi-Yagi patch antenna array proposed by the utility model, it includes a dielectric substrate whose lower surface is grounded, and also includes four antenna units and microstrip lines that are arranged on the upper surface of the dielectric substrate and are symmetrical in pairs with respect to the centroid of the dielectric substrate. , the antenna unit includes an active patch, two reflective patches, and a guide patch; wherein, the microstrip lines are respectively connected to the active patch, and the two reflective patches are located on the same side of the active patch. The source patch is located between the two reflective and guide patches.

As a solution for further optimization of the L-band quasi-Yagi patch antenna array described in the present invention, the active patch is a square, and the reflective patch and the guiding patch are both rectangular.

As a solution for further optimization of the L-band quasi-Yagi patch antenna array described in the present invention, the length of the reflective patch is four times the width.

As a solution for further optimization of the L-band quasi-Yagi patch antenna array described in the present invention, the distance between the guide patch and the active patch is 0.04 wavelengths.

As a solution for further optimization of the L-band quasi-Yagi patch antenna array described in the present invention, the distance between the reflective patch and the active patch is 0.03 wavelengths.

As a solution for further optimization of the L-band quasi-Yagi patch antenna array described in the present invention, the impedance of the microstrip line is 100 ohms.

As a solution for further optimization of the L-band quasi-Yagi patch antenna array described in the present invention, the size of the directing patch is 0.423 wavelengths.

As a solution for further optimization of the L-band quasi-Yagi patch antenna array described in the present invention, the antenna elements are separated by 0.6 wavelengths.

As a solution for further optimization of the L-band quasi-Yagi patch antenna array described in the present invention, the dielectric substrate is an FR4 dielectric board.

Compared with the prior art by adopting the above technical scheme, the utility model has the following technical effects:

(1) This utility model adopts the method of array on the basis of the quasi-Yagi antenna and uses the power transmission efficiency scheme between the antenna array and the receiving polarized antenna to obtain the best amplitude phase to increase the gain, and in For the first time in the L-band, a microstrip patch Yagi antenna is used as the antenna unit to design a high-gain antenna;

(2) The utility model provides a high-gain antenna with a gain of 9.3dB in the L-band. The design is simple in structure, easy to implement, and low in cost;

(3) The quasi-Yagi patch antenna design scheme is adopted in the L-band, combined with the optimization method of the array antenna, it can achieve higher gain and easier adjustment than other quasi-Yagi patch antennas. The quasi-Yagi patch antenna array uses FR4 board It has the characteristics of low cost and reduced area.

Description of drawings

Figure 1 is a schematic diagram of the quasi-Yagi patch antenna array.

Figure 2 is the quasi-Yagi patch antenna array return loss s11.

Figure 3 is a gain diagram of the quasi-Yagi patch antenna array.

The reference signs in the figure are interpreted as: 1-dielectric substrate, 2-active patch, 3-reflecting patch, 4-directing patch, 5-microstrip line, 6-excitation port.

Detailed ways

Below in conjunction with accompanying drawing, the technical scheme of the utility model is described in further detail:

As shown in Figure 1, it is a structural schematic diagram of a quasi-Yagi patch antenna array. The quasi-Yagi patch antenna array in the L-band includes a dielectric substrate 1 whose lower surface is grounded, and also includes a dielectric substrate 1 arranged on the upper surface of the dielectric substrate 1 and related to the dielectric substrate 1. Four symmetrical antenna units and a microstrip line 5 with two pairs of centroids, the antenna unit includes an active patch 2, two reflection patches 3, and a guide patch 4; wherein, the microstrip lines 5 are respectively connected to the active patch The two reflective patches 3 are located on the same side of the active patch 2, and the active patch 2 is located between the two reflective patches 3 and the guide patch 4.

The active patch 2 is a square, the reflective patch 3 and the guide patch 4 are rectangular, the length of the reflective patch 3 is four times the width, and the guide patch 4 and the active patch 2 are separated by 0.04 wavelengths, the distance between the reflective patch 3 and the active patch 2 is 0.03 wavelengths, the impedance of the microstrip line 5 is 100 ohms, and the size of the guide patch 4 is 0.423 wavelength, and the distance between the antenna elements is 0.6 wavelength. The dielectric substrate 1 is an FR4 dielectric board. The size of the board is 5mm*164mm*289mm, the lower surface of the dielectric substrate 1 is a grounding plate, and the upper surface is etched with a metal patch. The active patch 2 radiates electromagnetic waves to space after being fed, so that the reflective patch 3 and lead to the patch 4 generate induced current and radiation. Using the microstrip line feeding method, the corresponding feeding network is designed according to the best excitation obtained, and the feeding network and the antenna unit are formed as a whole. The 50Ω excitation port 6 is connected to the coaxial line to feed the antenna unit. The optimal amplitude phase is obtained by using the power transmission efficiency scheme between the antenna array and the receiving polarized antenna, and the corresponding feed network is designed to form a whole with the feed network and the antenna unit. The antenna is printed on a 5mm*164mm*289mm FR4 dielectric board and fed through the coaxial cable end. If higher gain is required, simply add another radiating element. Adjusting the length of the microstrip feedline results in changes in the amplitude and phase of the input to achieve quasi-endfire.

In one antenna unit: the active patch 2 has a value of 0.47 wavelengths, and the depression of the active patch 2 is used to connect a 100-ohm microstrip line. The size of the guide patch 4 is 0.423 wavelengths, the total size of the two reflective patches 3 is 1.15 times that of the active patch 2, and the width of the reflective patch 3 is 1/4 times the length of the reflective patch 3. The distance between patch 4 and active patch 2 is 0.04 wavelength, and the distance between reflective patch 3 and active patch 2 is 0.03 wavelength. The distance between two reflective patches 3 is the same as the size of the depression in active patch 2. About 0.1 wavelength. The distance between the antenna elements is 0.6 wavelength. The feeder is designed according to the amplitude and phase of the input power of each antenna unit. When the 50-ohm excitation port comes out, there are two 100-ohm microstrip lines, and the phase difference between the two microstrip lines is 180 degrees. The 100-ohm microstrip line is further divided into two 100-ohm impedance transformation lines for impedance change, and the 70.7-ohm microstrip line is connected to the 100-ohm input port.

Figure 2 is the quasi-Yagi patch antenna array return loss s11. The return loss at the center frequency of 1670MHz is about -31db, indicating that the antenna is well matched.

Figure 3 is a gain diagram of the quasi-Yagi patch antenna array, which is a 2D gain diagram of the quasi-Yagi patch antenna array, and the two line segments are the 2D gain diagrams of the xoz plane and the xoy plane, respectively. Simulation results show that the gain at 3° at 1670MHz reaches about 9.17. The front-to-back ratio is about 33, which has a good gain and front-to-back ratio.

To sum up, the design of the quasi-Yagi patch antenna array in the L band has been verified, and the use of this scheme can be extended to engineering applications.

The above embodiments are only to illustrate the technical ideas of the present utility model, and cannot limit the scope of protection of the present utility model for this reason. Any changes made on the basis of technical solutions according to the technical ideas proposed by the utility model all fall into the scope of this utility model. within the scope of the new protection.

Claims (9)

1. The accurate Yagi spark gap patch antenna array of 1.L wave band, comprise the medium substrate of lower surface ground connection, it is characterized in that, also comprise and be arranged on medium substrate upper surface and about symmetrical between two four antenna elements, the microstrip lines of the barycenter of medium substrate, described antenna element comprises active paster, two reflection pasters, guides paster into; Wherein, microstrip line is connected with active paster respectively, and two reflection pasters are positioned at the same side of active paster, and active paster is at two reflection pasters and guide between paster.
2. 2. the accurate Yagi spark gap patch antenna array of L-band according to claim 1, is characterized in that, described active paster is square, reflects paster and guide paster into be rectangle.
3. 3. the accurate Yagi spark gap patch antenna array of L-band according to claim 2, is characterized in that, the length of described reflection paster is four times of width.
4. 4. the accurate Yagi spark gap patch antenna array of L-band according to claim 1, is characterized in that, described in guide between paster and active paster at a distance of 0.04 wavelength.
5. 5. the accurate Yagi spark gap patch antenna array of L-band according to claim 1, is characterized in that, at a distance of 0.03 wavelength between described reflection paster and active paster.
6. 6. the accurate Yagi spark gap patch antenna array of L-band according to claim 1, is characterized in that, the impedance of described microstrip line is 100 ohm.
7. 7. the accurate Yagi spark gap patch antenna array of L-band according to claim 1, is characterized in that, described in guide paster into and be of a size of 0.423 wavelength.
8. 8. the accurate Yagi spark gap patch antenna array of L-band according to claim 1, is characterized in that, at a distance of 0.6 wavelength between described antenna element.
9. 9. the accurate Yagi spark gap patch antenna array of L-band according to claim 1, is characterized in that, described medium substrate is FR4 dielectric-slab.