KR101055012B1 - PCB Antenna with Inductive Coupling - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printed circuit board (PCB) antenna using inductive coupling capable of simply changing the resonance frequency and transmitting and receiving multiband and wideband frequency signals. A ground pattern formed on the whole, a reference slot formed perpendicularly to a middle portion of the ground pattern formed on the upper surface of the PCB, a feed line pattern formed at the lower end of the reference slot and supplied with radiated power, and ground patterns on both left and right sides of the reference slot And a plurality of slots for inductive coupling formed at the upper side thereof, wherein the power supplied to the power supply line pattern is inductively coupled to the V-shape.

Antenna, Inductive Coupling, Slot, Resonant Frequency, Wideband, Multiband

Description

Printed Circuit Board antenna using inductive coupling

The present invention relates to a printed circuit board (PCB) antenna using inductive coupling.

In general, the wireless communication device must use an antenna to transmit and receive a signal of a predetermined frequency. Various kinds of such antennas are known.

In such an antenna, in recent years, much effort has been made to miniaturize the size of the antenna, and in mounting the antenna to the wireless communication device, the antenna can be directly configured on a PCB mounted inside the wireless communication device by removing the external type. There is an active research on the built-in antenna.

As a built-in antenna, a microstrip patch antenna is known which prints a pattern of microstrip patches on a PCB.

The microstrip patch antenna using the PCB has an advantage of facilitating frequency tuning and bandwidth expansion using various slots and stacking techniques.

However, the microstrip patch antenna using the PCB has a problem in that a range of resonant frequencies that can be changed is limited.

Therefore, the problem to be solved by the present invention provides a PCB antenna using an inductive coupling that can easily change the resonance frequency.

The present invention also provides a PCB antenna using inductive coupling capable of transmitting and receiving multiband and wideband frequency signals.

The present invention also provides a PCB antenna using inductive coupling having directivity in a specific direction.

Technical problems to be achieved by the present invention are not limited to the above-mentioned technical problems, and other technical problems not mentioned above may be clearly understood by those skilled in the art to which the present invention pertains. There will be.

PCB antenna using the inductive coupling of the present invention, the printed circuit board (PCB), the ground pattern formed on the entire back and top of the PCB, the reference formed perpendicular to the middle of the ground pattern formed on the upper surface of the PCB An inductive couple in a V-shaped slot, a feed line pattern formed at a lower end of the reference slot, and to which radiated power is supplied, and a ground pattern formed at both left and right sides of the reference slot, and supplied to the feed line pattern. It includes a plurality of inductive coupling slots for inductive coupling.

Open slots are formed in the upper ends of the left and right sides of the ground pattern formed on the upper surface of the PCB to prevent inductive coupling from occurring.

The plurality of inductive coupling slots are formed parallel to each other at predetermined intervals and spaced upwardly by a predetermined interval in the longitudinal direction so as to form an overall "V" shape around the feed line pattern.

The plurality of inductive coupling slots are formed parallel to each other at predetermined intervals and spaced upwardly by a predetermined interval in the longitudinal direction so as to form an overall "V" shape around the feeding line pattern. As the upper portion is positioned based on the line pattern, the length is formed to be sequentially increased.

Among the plurality of inductive coupling slots, the longest inductive coupling slot has a length of λ / 4 (where λ is a wavelength of a use frequency).

In addition, the PCB antenna using the inductive coupling of the present invention, a printed circuit board (PCB), a ground pattern formed on the entire back and top of the PCB, and is formed perpendicular to the middle of the ground pattern formed on the upper surface of the PCB Inductively formed at the lower end of the reference slot, the lower end of the reference slot and the feed line pattern to which the radiated power is supplied, and the ground patterns at both the left and right sides of the reference slot, and the power supplied to the feed line pattern is inverted V-shaped. It includes a plurality of slots for inductive coupling coupled (Inductive Coupling).

An open slot is formed at an upper end of the reference slot to prevent inductive coupling from occurring.

The plurality of inductive coupling slots are formed parallel to each other at predetermined intervals and spaced upwardly by a predetermined interval in the longitudinal direction so as to form an inverted V-shape as a whole with respect to the feed line pattern.

The plurality of inductive coupling slots are formed parallel to each other at predetermined intervals and spaced upwardly by a predetermined interval in the longitudinal direction so as to form an inverted V shape with respect to the feeding line pattern as a whole. The longer the position is located on the basis of the pattern is formed to be shorter in sequence.

The plurality of inductive coupling slots have a length of λ / 4 (where λ is a wavelength of a use frequency).

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The length of the plurality of inductive coupling slots is λ / 4.

The plurality of inductive coupling slots are formed in a rectangular shape.

The plurality of inductive coupling slots may be any one of circular, elliptical, or polygonal both ends in the longitudinal direction.

According to the PCB antenna using the inductive coupling of the present invention, the present invention forms a plurality of slots for inductive coupling on the PCB, the current fed in the feed line pattern is V-shaped by the plurality of inductive coupling slots Or inverse V-shape to allow radiant inductive coupling to occur.

The present invention can simply change the resonant frequency by adjusting the length and width of the slot for inductive coupling and the interval between the slots for inductive coupling.

In addition, the present invention may transmit and receive multiband and wideband frequency signals, and may have directivity in a specific direction.

The following detailed description is only illustrative, and merely illustrates embodiments of the present invention. In addition, the principles and concepts of the present invention are provided for the purpose of explanation and most useful.

Accordingly, various forms that can be implemented by those of ordinary skill in the art, as well as not intended to provide a detailed structure beyond the basic understanding of the present invention through the drawings.

Figure 1a is a plan view showing the configuration of an embodiment of a PCB antenna of the present invention, Figure 1b is a cross-sectional view taken along line A-A of Figure 1a. Here, reference numeral 100 denotes a PCB. The PCB 100 uses, for example, Flame Retardant 4 (FR4).

Ground patterns 102 and 104 are formed on the entire back and top surfaces of the PCB 100.

The reference slot 106 is vertically formed in the middle of the ground pattern 104 formed on the entire surface of the PCB 100 and the CPW (Coplanar Waveguide) feeding method at the lower end of the reference slot 106. A feed line pattern 108 that is fed is formed.

The ground patterns 104 located on both the left and right sides of the reference slot 106 have a predetermined width and length so that the power supplied to the feed line pattern 108 is inductively coupled in a V shape. The plurality of inductive coupling slots 110 and 112 are formed at predetermined intervals.

For example, each of the ground patterns 104 positioned on the left and right sides of the reference slot 106 may include eleven inductive coupling slots 110 (110; 110-1 to 110-11) 112 having predetermined widths and lengths; 112-1 to 112-11 are formed parallel to each other with a predetermined distance therebetween and are spaced upwardly by a predetermined distance in the longitudinal direction so that the 11 inductive coupling slots 110 (110-1 to 110-11) ( 112; 112-1 to 112-11 are formed to form a "V" shape as a whole.

In addition, open slots 114 and 116 are formed at upper ends of the left and right ends of the collecting patterns 104 formed on the upper surface of the PCB 100 to prevent inductive coupling from occurring.

The PCB antenna of the present invention configured as described above is fed to the feed line pattern 108 by a CPW (Coplanar Waveguide) feeding method.

Power supplied to the power supply line pattern 108 maintains a predetermined interval therebetween, and the plurality of inductive coupling slots 110 and 112 arranged in a V-shape in parallel and spaced apart by a predetermined length from each other Through inductive coupling sequentially radiated. That is, the current supplied to the feed line pattern 108 is inductively coupled to the inductive coupling slots 110-1 and 112-1, respectively, and the inductive coupling slots 110-1 and 112-1. Surface current flowing in inductively coupled into the slots 110-2 and 112-2 (110-3 and 112-3). Radiate with inductive coupling sequentially to (110-11, 112-11).

Here, in the present invention, the length of the plurality of inductive coupling slots 110 and 112 is formed to have a length of λ / 4 (where λ is a wavelength of a use frequency) as shown in FIG. 2. In addition, the separation distance between the plurality of inductive coupling slots 110 and 112 is λ / 8 so that the surface current flowing through the inductive coupling slots 110 and 112 can be radiated smoothly while being sequentially inductively coupled. To help.

The coupling effect in the E field and the F field of the PCB antenna of the present invention was measured to obtain the results as shown in FIGS. 3A and 3B, respectively. And the density (density) in the E field and the F field for the PCB antenna of the present invention was measured to obtain the results as shown in Figure 4a and 4b, respectively. Alternatively, as a result of measuring the radiation characteristics in the xy plane and xz plane for the PCB antenna of the present invention as shown in Figure 5a and 5b respectively.

As shown in FIGS. 3 to 5, the PCB antenna of the present invention sequentially supplies inductive couples through a plurality of inductive coupling slots 110 and 112 with current supplied to the feed line pattern 108 in a CPW feeding manner. It can be seen that the ring is amplified and radiated into the air.

6A and 6B are graphs illustrating a result of measuring resonance frequencies by varying lengths of inductive coupling slots 110 and 112 in the PCB antenna of the present invention.

6A shows that the lengths of the inductive coupling slots 110 and 112 have a predetermined length, and FIG. 6B shows the lengths of the inductive coupling slots 110 and 112 shorter than the predetermined length by λ / 16. Figure 1 shows the measurement of the resonance frequency in the case.

6A and 6B, it can be seen that the present invention changes the resonance frequency when the lengths of the slots 110 and 112 for inductive coupling are varied.

In addition, the present invention can be seen that the resonant frequency is variable by adjusting the width of the inductive coupling slots (110, 112) and the interval between the plurality of inductive coupling slots (110, 112).

7 (a) to (d) are views showing another embodiment of a slot for inductive coupling in the PCB antenna of the present invention. As shown in (a) to (d) of FIG. 6, the present invention provides slots 110 and 112 of the inductive coupling in the longitudinal direction with both ends formed in a semicircle, an ellipse, or a polygon including a triangle. It can also be configured.

8 is a plan view showing the configuration of another embodiment of a PCB antenna of the present invention. Referring to FIG. 8, another embodiment of the present invention sequentially forms the lengths of the plurality of inductive coupling slots 110-1 to 110-11 and 112-1 to 112-11 in an upward position. can do.

In this case, the length of the longest inductive coupling slots 110-11 and 112-11 is preferably λ / 4 or less so that the inductive coupling is smoothly performed.

9 is a plan view showing the configuration of another embodiment of a PCB antenna of the present invention. Referring to FIG. 9, power supplied to the feed line pattern 108 may be inductively coupled to the ground pattern 104 positioned at both left and right sides of the reference slot 106 in an inverted V shape. A plurality of inductive coupling slots 110 and 112 having a predetermined width and length are formed at predetermined intervals.

Here, the interval between the first inductive coupling slots 110-1 and 112-1 to which the current supplied to the feed line pattern 108 is inductively coupled with the feed line pattern 108 is λ / 4 or less Formed so that the current supplied to the feed line pattern 108 is inductively coupled to the slots 110-1 and 112-1 for inductive coupling, and slots 110-1 and 112 for inductive coupling. The current inductively coupled to -1) is sequentially inductively coupled to the slots 110-2 to 110-11 and 112-2 to 112-11 for inductive coupling.

In addition, an upper end of the reference slot 106 has an open slot 900 so that currents inductively coupled to the inductive coupling slots 110-11 and 112-11 are no longer inductively coupled. Is formed.

Another embodiment of the PCB antenna of the present invention configured as described above is fed to the feed line pattern 108 by CPW feeding method, the current fed to the feed line pattern 108 is a slot for inductive coupling (110-1 ~ 110) -11, 112-1 to 112-11) and are sequentially radiated with inductive coupling.

Here, according to another embodiment of the present invention, the inductive coupling slots 110-1 to 110-11 and 112-1 to 112-11 form an inverted 'V' shape to induct in the direction of the reference slot 106. As a result of the coupling, the radiated power is concentrated in the direction of the reference slot 106 so that the similar power is directed in the direction of the reference slot 106.

10 is a plan view showing still another embodiment of the PCB antenna of the present invention. Referring to FIG. 9, as illustrated in FIG. 9, the slots 110-1 to 110-11 and 112-1 to 112-11 of the plurality of inductive coupling slots in the PCB antenna have directivity in a specific direction. As the length is positioned in an upward position, the length may be sequentially shortened.

According to another exemplary embodiment of the present invention, the plurality of inductive coupling slots 110-11 to 110-1 and 112-11 to 112-1 located in an upward position have a shorter length, thereby providing a plurality of feeding line patterns 108. The fed current may be more concentrated in the direction of the reference slot 106 to have a directivity that is more concentrated in the direction of the reference slot 106.

The present invention has been described in detail with reference to exemplary embodiments, but those skilled in the art to which the present invention pertains can make various modifications without departing from the scope of the present invention. I will understand.

Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined by the claims below and equivalents thereof.

According to the present invention, a plurality of inductive coupling slots are formed in a PCB so that current supplied in a feed line pattern is radiated while inductive coupling occurs in a V shape or an inverted V shape by a plurality of inductive coupling slots. do.

The PCB antenna using the inductive coupling of the present invention can easily change the resonant frequency by adjusting the length and width of the slot for inductive coupling and the interval between the slots for inductive coupling, and the frequency signal of the multi-band and wideband It can transmit and receive, and can have directivity in a particular direction.

Figure 1a is a plan view showing the configuration of an embodiment of a PCB antenna of the present invention,

Figure 1b is a cross-sectional view taken along the line A-A of Figure 1a,

Figure 2 is a view for explaining the spaced apart while parallel to each other a plurality of slots for inductive coupling in the PCB antenna of the present invention,

3a and 3b is a view showing the coupling effect in the E field and F field in the PCB antenna of the present invention, respectively,

4a and 4b is a view showing the measurement of the density (density) in the E field and F field in the PCB antenna of the present invention, respectively;

5a and 5b is a view showing the measurement of the radiation characteristics in the xy plane and xz plane, respectively, in the PCB antenna of the present invention,

6a and 6b are graphs showing the resonance frequency characteristics measured by varying the length of the slot for inductive coupling in the PCB antenna of the present invention,

7 (a) to (c) is a view showing another embodiment of a slot for inductive coupling in the PCB antenna of the present invention,

8 is a plan view showing the configuration of another embodiment of the PCB antenna of the present invention,

9 is a plan view showing the configuration of another embodiment of a PCB antenna of the present invention, and

10 is a plan view showing a configuration of another embodiment of a PCB antenna of the present invention.

Claims (14)

A printed circuit board (PCB); A ground pattern formed on the entire back and top of the PCB; A reference slot formed perpendicularly to a middle portion of the ground pattern formed on the upper surface of the PCB; A feed line pattern formed at a lower end of the reference slot and configured to supply radiated power; And Inductive coupling including; a plurality of inductive coupling slots formed in the ground pattern on the left and right sides of the reference slot, the power supplied to the feed line pattern is inductively coupled in a V-shape (inductive coupling); PCB antenna using The method of claim 1, PCB antenna using an inductive coupling is formed in the open slot to prevent inductive coupling is generated in the upper left and right sides of the ground pattern formed on the upper surface of the PCB. The method of claim 1, wherein the plurality of inductive coupling slots; A PCB antenna using an inductive coupling formed parallel to each other at a predetermined interval and spaced upwards by a predetermined interval in the longitudinal direction to form an overall "V" shape around the feed line pattern. The method of claim 1, wherein the plurality of inductive coupling slots; It is formed parallel to each other at a predetermined interval and spaced upwards by a predetermined interval in the longitudinal direction to form a "V" shape around the power supply line pattern as a whole, located above the power supply line pattern PCB antenna using inductive coupling is formed to be longer in sequence. The inductive coupling slot of claim 4, wherein the slot for the longest length of the plurality of inductive coupling slots comprises: a slot for inductive coupling; PCB antenna using inductive coupling having a length of λ / 4 (where λ is the wavelength of the frequency of use). A printed circuit board (PCB); A ground pattern formed on the entire back and top of the PCB; A reference slot formed perpendicularly to a middle portion of the ground pattern formed on the upper surface of the PCB; A feed line pattern formed at a lower end of the reference slot and configured to supply radiated power; And An inductive coupler including a plurality of inductive coupling slots formed in the ground patterns on both the left and right sides of the reference slot, and the power supplied to the feed line pattern is inductively coupled in an inverted V shape; PCB antenna with ring. The method of claim 6, PCB antenna using an inductive coupling is formed in the upper end of the reference slot to prevent the inductive coupling is generated. The method of claim 6, wherein the plurality of inductive coupling slots; A PCB antenna using an inductive coupling formed parallel to each other at a predetermined interval and spaced upwardly by a predetermined interval in the longitudinal direction to form an inverted V shape with respect to the feed line pattern. The method of claim 6, wherein the plurality of inductive coupling slots; They are formed parallel to each other at predetermined intervals and spaced upwardly by a predetermined interval in the longitudinal direction to form an inverted V shape with respect to the feed line pattern as a whole. PCB antenna using inductive coupling formed shorter sequentially in position. The method of claim 6, wherein the length of the plurality of inductive coupling slots; PCB antenna using inductive coupling formed of a length of λ / 4 (where λ is the wavelength of the frequency of use). delete 10. The apparatus of any one of claims 1, 3, 4, 6, 8 and 9, wherein the length of the plurality of inductive coupling slots; PCB antenna with inductive coupling of λ / 4. 10. The method of claim 1, 3, 4, 6, 8, and 9, wherein the plurality of inductive coupling slots; PCB antenna using inductive coupling formed in a rectangular shape. 10. The method of claim 1, 3, 4, 6, 8, and 9, wherein the plurality of inductive coupling slots; PCB antenna using inductive coupling, both ends of which are either circular, elliptical or polygonal in the longitudinal direction.

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