KR100562786B1 - Small-sized Microstrip Patch Antenna - Google Patents

Abstract

A ground plate formed into a predetermined shape, a patch provided at a predetermined distance from the ground plate, a dielectric layer provided between the ground plate and the patch, and the patch and / Or it provides a small microstrip patch antenna including a plurality of protruding pieces arranged on the ground plate at a predetermined interval and installed at a predetermined height.

Microstrip Patch Antenna, Protrusions, Dielectrics, Ground Plates, Miniaturized, Mobile Phone, Surface Area

Description

Small Microstrip Patch Antenna {Small-sized Microstrip Patch Antenna}

1 is an exploded perspective view showing a first embodiment of a small microstrip patch antenna according to the present invention.

2 is an assembled cross-sectional view showing a first embodiment of a small microstrip patch antenna according to the present invention.

3 is a bottom perspective view showing an embodiment of a patch for obtaining circularly polarized waves in the first embodiment of the small microstrip patch antenna according to the present invention.

Fig. 4 is a bottom perspective view showing another embodiment of a patch for obtaining circularly polarized waves in the first embodiment of the small microstrip patch antenna according to the present invention.

5 is an exploded perspective view schematically illustrating a method of forming a patch using a dielectric thin film in a first embodiment of a small microstrip patch antenna according to the present invention.

6 is an exploded perspective view schematically illustrating another method of forming a patch using a dielectric thin film in a first embodiment of a small microstrip patch antenna according to the present invention.

7 is an assembled cross-sectional view showing a second embodiment of a small microstrip patch antenna according to the present invention.

8 is an assembled cross-sectional view showing a third embodiment of a small microstrip patch antenna according to the present invention.

9 is an assembled cross-sectional view showing a fourth embodiment of the small microstrip patch antenna according to the present invention.

10 is an exploded perspective view showing a fifth embodiment of a small microstrip patch antenna according to the present invention.

11 is an assembled cross-sectional view showing a fifth embodiment of the small microstrip patch antenna according to the present invention.

12 is an assembled sectional view showing the sixth embodiment of the small microstrip patch antenna according to the present invention.

Fig. 13 is an assembled sectional view showing the seventh embodiment of the small microstrip patch antenna according to the present invention.

14 is a view schematically showing a first embodiment for measuring the return loss and the radiation pattern in the small microstrip patch antenna according to the present invention, (a) is a plan view, (b) is a side view.

15 is a graph showing the return loss measured using Example 1 of FIG.

FIG. 16 is a graph illustrating a radiation pattern measured using Example 1 of FIG. 14.

FIG. 17 is a view schematically showing Embodiment 2 for measuring a reflection loss and a radiation pattern in a small microstrip patch antenna according to the present invention, where (a) is a plan view and (b) is a side view.

18 is a graph showing the return loss measured using Example 2 of FIG.

FIG. 19 is a graph showing a radiation pattern measured using Example 2 of FIG. 17.

20 is a view schematically showing a third embodiment for measuring the return loss and the radiation pattern in the small microstrip patch antenna according to the present invention, (a) is a plan view, (b) is a side view.

21 is a graph showing the return loss measured using Example 3 of FIG.

FIG. 22 is a graph illustrating a radiation pattern measured using Example 3 of FIG. 20.

FIG. 23 is a view schematically showing a fourth embodiment for measuring the return loss and the radiation pattern in the small microstrip patch antenna according to the present invention, where (a) is a plan view and (b) is a side view.

24 is a graph showing the return loss measured using Example 4 of FIG.

FIG. 25 is a graph illustrating a radiation pattern measured using Example 4 of FIG. 23.

FIG. 26 is a view schematically showing Comparative Example 1 for measuring return loss and radiation pattern in a conventional microstrip patch antenna, (a) is a plan view, and (b) is a side view.

FIG. 27 is a graph showing the return loss measured using Comparative Example 1 of FIG. 26.

FIG. 28 is a graph illustrating a radiation pattern measured using Comparative Example 1 of FIG. 26.

29 is a diagram schematically showing Comparative Example 2 for measuring the return loss and the radiation pattern in the conventional microstrip patch antenna, (a) is a plan view, and (b) is a side view.

30 is a graph showing the return loss measured using Comparative Example 2 of FIG.

FIG. 31 is a graph illustrating a radiation pattern measured using Example 2 of FIG. 29.

32 is a graph showing the measurement of the change in the resonant frequency while increasing the number of protruding pieces in the patch or ground plate in the small microstrip patch antenna according to the present invention.

The present invention relates to a miniature microstrip patch antenna, and more particularly, to a miniaturized microstrip patch antenna that can be miniaturized by increasing the surface area by forming protrusions on the patch and / or the ground plate, and is advantageous for mass production.

Recently, with the development of wireless communication technology, generalization and popularization of information communication terminals such as mobile phones, PDAs, GPS, etc. have become possible, and these information communication terminals can be manufactured in a small size, light weight, flat type, and can be manufactured in a small size. Strip patch antennas are mainly used.

The conventional microstrip patch antenna has a dielectric layer formed to have a predetermined thickness therebetween, and a planar patch serving as an antenna is installed on one side (upper side), and a ground plate is installed on the opposite side (lower side). Is done.

In general, the size of the microstrip patch antenna is proportional to the wavelength of the design frequency. In order to reduce the size of the same frequency, the microstrip patch antenna should be made of a dielectric material having a high dielectric constant. However, when a dielectric having a high dielectric constant is used, there is a limit because the radiation characteristic of the antenna is degraded and the gain is reduced as a result. In addition, when the dielectric constant of the dielectric material is increased, the production cost is relatively increased as well as the production yield is drastically reduced. Therefore, there is a limit in shortening the size of the antenna using a dielectric having a high dielectric constant.

In order to solve the above problems, Korean Unexamined Patent Publication No. 2003-25475 discloses a technique for a microstrip patch antenna that enables the miniaturization by increasing the surface area by repeatedly forming irregularities in the patch.

Korean Patent Laid-Open Publication No. 2003-25475 has a pattern in which a convex portion and a concave portion are alternately formed in a straight line in a longitudinal direction in a patch, or a convex portion and a concave portion are formed in a checkerboard shape in the longitudinal and width directions. Background Art A technique for forming irregularities in a pattern of a shape in which convex portions and concave portions are alternately formed in a band shape along a circumference in a pattern or wave shape is disclosed.

However, even in Unexamined Patent Publication No. 2003-25475, since the width of the irregularities forming the unevenness is basically required, there is a limit in miniaturization from the geometric shape, and the manufacturing process is performed because the unevenness is formed in the patch made of a very thin plate. Tricky and difficult

The present invention aims to provide a miniaturized microstrip patch antenna that can be further miniaturized and mass-produced by further developing the concept proposed in Korean Patent Laid-Open Publication No. 2003-25475.

The small microstrip patch antenna proposed by the present invention includes a ground plate formed in a predetermined shape, a patch provided at a predetermined distance from the ground plate, a dielectric layer provided between the ground plate and the patch, the patch and And / or a plurality of protruding pieces arranged on the ground plate at predetermined intervals and installed at predetermined heights.

The protruding pieces provided on the patch and the protruding pieces provided on the ground plate are arranged in a zigzag manner so as not to short-circuit each other.

The protruding pieces are arranged at predetermined intervals to be installed long in parallel with the radial slot of the patch.

Next, a preferred embodiment of a small microstrip patch antenna according to the present invention will be described in detail with reference to the drawings.

First, the first embodiment of the small microstrip patch antenna according to the present invention, as shown in Figures 1 and 2, the ground plate 10 is formed in a predetermined shape, and the ground plate 10 and a predetermined distance The patch 20 is installed, the dielectric layer 40 is provided between the ground plate 10 and the patch 20, and the patch 20 is arranged at a predetermined interval toward the ground plate 10 It comprises a plurality of protruding pieces 24 protruding to a predetermined height.

The patch 20 is connected to a feed line 32 connected to the feed member 30 installed on the ground plate 10.

The ground plate 10 is formed with a feed hole 34 through which the feed line 32 is installed so that the feed line 32 is connected to the feed member 30 without being electrically shorted with the ground plate 10. do.

The power feeding member 30 is provided with an insulating member (not shown) between the ground plate 10 and the ground plate 10 so as not to be electrically shorted.

The feed member 30 and the feed line 32 are made of a line or the like that is printed in the actual microstrip patch antenna. Since the feed member 30 and the feed line 32 can be implemented in the same configuration as a general microstrip patch antenna, detailed description thereof will be omitted.

The patch 20 and the ground plate 10 are formed of a metal thin plate having excellent electrical conductivity. For example, the patch 20 and the ground plate 10 may be formed of a metal thin plate such as copper (Cu) or aluminum (Al), and have excellent electrical conductivity, silver (Ag) having good moldability and workability, It is also possible to form by thin plates, such as gold (Au).

It is preferable that the protruding pieces 24 can be formed integrally in the same process using the same material as the patch 20 and the ground plate 10.

The protruding pieces 24 are arranged in a predetermined interval in parallel with the radial slot of the patch 20 to be installed long.

The protruding pieces 24 protrude from the patch main body 22 of the patch 20 formed in various plate shapes such as circles, triangles, squares, and pentagons at predetermined intervals in parallel along edges or edges.

In order to implement the linear polarization in the above, as shown in Figure 1, the patch body 22 is formed in a rectangular shape, the patch body 22 in the radial slot direction is elongated at a predetermined interval to the protrusion piece 24 Form.

As shown in FIG. 3, the patch main body 22 is formed in a quadrangular shape, and the protruding pieces 24 are formed in a lattice shape at predetermined intervals in a vertical and horizontal direction, or the patch main body 22 as shown in FIG. 4. ) May be formed in a circular shape or the like, and the protruding piece 24 may be formed concentrically along the edge. Even when the patch main body 22 is formed in a polygonal shape such as a quadrangle or a pentagon, the protruding piece 24 may be formed in a concentric polygonal shape which is arranged at a predetermined interval along the border and is reduced.

As described above, when the protrusion pieces 24 are formed in a lattice shape at a predetermined interval horizontally or vertically or concentrically along the edges, both the horizontal and vertical lengths can be reduced, so that further miniaturization is possible.

In the case of the configuration as described above, the circular polarization may be implemented by configuring the horizontal and vertical lengths of the patch 20 differently, or by forming a slot or feeding power to have a phase difference.

As the dielectric constituting the dielectric layer 40, an air layer may be used, and dielectrics of various materials, such as Teflon, ceramic, glass, epoxy, and synthetic resin, may be used.

When the air layer is used as the dielectric layer 40 in the above, as shown in FIGS. 1 and 2, the gap keeping member 42 maintains the gap between the patch 20 and the ground plate 10 and supports the patch 20. ) To the ground plate (10).

The spacing member 42 is preferably installed in a predetermined pattern in the corner portion and / or the center portion of the patch so as not to affect the dielectric constant while stably supporting the patch 20. In addition, the spacing member 42 is preferably made of a non-metallic material or a non-conductive material having a low dielectric constant such as ceramic, synthetic resin, and wood so as not to affect the dielectric constant of the dielectric layer 40.

In the case where the dielectric layer 40 is formed using ceramics or the like, as shown in FIG. 5, the protrusion pieces 24 are printed on one side of the dielectric thin film 50 having a thin thickness by using a conductive material. Coating), a patch hole 52 for forming a patch 20 is formed on one side, and a plurality of dielectric thin films 50 are laminated, a conductive material is filled in the patch hole 52, and then heated and melted and baked. It is also possible to form the patch 20 by making it.

The feed line 32 is printed on some of the dielectric thin films 50.

In addition, as shown in FIG. 6, in the case of forming the dielectric layer 40 by stacking the dielectric thin film 50 having a thin thickness, the conductive material is printed on the patch 20 on the dielectric thin film 50 located at the top. (Coating), and a plurality of protruding piece holes 54 are formed in a predetermined pattern in the dielectric thin film 50 and the other dielectric thin film 50, to which the patch 20 is printed, and the dielectric thin film 50 to a predetermined height. ), Then the protrusion piece hole 54 is filled with a conductive material, heated and melt-baked to form a protrusion piece 24 having a plurality of protrusions in series.

When the distance between the projections is set to 1/10 or less of the wavelength λ, the projection pieces 24 are formed in a plane even in the case of the projection pieces 24 in which a plurality of projections are continuous due to the characteristics of radio waves. The same effect as that obtained can be obtained.

As described above, the method using the dielectric thin film 50 and the through hole is generally applicable to the method used in the manufacture of the microstrip patch antenna, and thus the detailed description thereof will be omitted.

In the second embodiment of the small microstrip patch antenna according to the present invention, as shown in FIG. 7, the both sides of the width direction of the ground plate 10 are vertically folded along the side of the patch 20 to protrude 14. ).

It is also possible to fold up the entire edge of the ground plate 10 vertically along the side of the patch 20.

If the entire edge of the ground plate 10 is folded vertically along the side of the patch 20 as described above, it is possible to reduce the length of both the horizontal and vertical can be further miniaturized.

In the case of the configuration as described above, the circular polarization may be implemented by configuring the horizontal and vertical lengths of the patch 20 differently, or by forming a slot or feeding power to have a phase difference.

In the third embodiment of the small microstrip patch antenna according to the present invention, as shown in FIG. 8, both edges of the ground plate 10 in the width direction are formed in a substantially "c" shape along the side and the top surface of the patch 20. Fold in double to form a vertical projections 14 and the horizontal upper surface portion 15.

It is also possible to form the horizontal upper surface portion 15 along the entire edge of the ground plate 10 in this case, in this case, the horizontal upper surface portion 15 may be formed in a shape cut diagonally overlapping so as not to overlap each other. Do.

If the horizontal upper surface portion 15 is formed along the entire edge of the ground plate 10 as described above, it is possible to reduce both the length of the horizontal and vertical can be further miniaturized.

In the case of the configuration as described above, the circular polarization may be implemented by configuring the horizontal and vertical lengths of the patch 20 differently, or by forming a slot or feeding power to have a phase difference.

In a fourth embodiment of the small microstrip patch antenna according to the present invention, as shown in FIG. 9, a direction parallel to the ground plate 10 is formed from the protruding pieces 24 formed at both ends of the patch 20. Fold to form a horizontal portion 26.

It is also possible to form the horizontal portion 26 along the entire edge of the patch 20 in the above.

Also in the above-described second to fourth embodiments, the present invention can be implemented in the same configuration as the above-described first embodiment except for the above-described configuration, and thus the detailed description thereof will be omitted.

In the fifth embodiment of the small microstrip patch antenna according to the present invention, as shown in FIGS. 10 and 11, a ground plate 10 formed in a predetermined shape and a predetermined distance from the ground plate 10 are provided. It is arranged in the patch 20 and the ground plate 10 and the dielectric layer 40 provided between the ground plate 10 and the patch 20, and the ground plate 10 at a predetermined interval toward the patch 20 It comprises a plurality of protrusions 14 protruding to a predetermined height.

The protruding piece 14 is a plate body 12 of the ground plate 10 is formed in a shape corresponding to the patch body 22 of the patch 20 formed in various plate shapes such as circles, triangles, squares, pentagons, etc. It protrudes at predetermined intervals in parallel along edges or edges.

In the sixth embodiment of the small microstrip patch antenna according to the present invention, as shown in FIG. 12, the protruding pieces of the ground plate 10 at both ends of the patch 20 in the fifth embodiment. It folds vertically parallel to (14) to form the protruding piece 24, and again horizontally parallel to the plate body 12 of the ground plate 10 to form a horizontal portion (26).

Also in the above-described fifth and sixth embodiments, the present invention can be implemented in the same configuration as the above-described first to fourth embodiments except for the above-described configuration, and thus detailed description thereof is omitted.

In addition, according to the seventh embodiment of the small microstrip patch antenna according to the present invention, a ground plate 10 having a predetermined shape and a predetermined distance from the ground plate 10 are installed as shown in FIG. The patch 20, the dielectric layer 40 provided between the ground plate 10 and the patch 20, and the ground plate 10 and the patch 20 are arranged at predetermined intervals so as to mutually have a predetermined height. It includes a plurality of protruding pieces (14, 24) installed to protrude into.

The protruding pieces 24 provided on the patch 20 and the protruding pieces 14 provided on the ground plate 10 are preferably arranged in a zigzag manner so as not to be short-circuited with each other.

Also in the seventh embodiment described above, the present invention can be implemented in the same configuration as in the first to sixth embodiments except for the above-described configuration, and thus detailed description thereof is omitted.

Next, various examples of the small microstrip patch antenna according to the present invention were manufactured to measure the characteristics of the antenna.

Example 1

As shown in Figs. 14 (a) and (b), a patch 20 of 90 mm x 48 mm is placed at the center of the ground plate 10 at a distance of 9 mm from the ground plate 10 of 128 mm x 66 mm. Fold 8 mm by 8 mm from both edges of the patch 20 toward the ground plate 10 to form the protruding piece 24, and connect the feed line 32 and the feed member 30 to the small microstrip according to the present invention. Example 1 of a patch antenna was prepared.

The reflection loss and the radiation pattern were measured using Example 1 manufactured as described above, and are shown in FIGS. 15 and 16, respectively.

Example 2

As shown in Figs. 17A and 17B, a patch 20 of 90 mm × 40 mm is placed at the center of the ground plate 10 at a distance of 9 mm from the ground plate 10 of 300 mm × 300 mm. Fold 8 mm by 8 mm toward the ground plate 10 parallel to the 90 mm edges at predetermined intervals along the 40 mm edges of the patch 20 to form 12 protruding pieces 24, and the feed line 32 and the power feeding member 30. ) Was prepared in Example 2 of the small microstrip patch antenna according to the present invention.

18 and 19 are respectively measured by measuring the return loss and the radiation pattern using Example 2 manufactured as described above.

Example 3

As shown in Fig. 20 (a), (b), a patch 20 of 90 mm × 46 mm is placed in the center of the ground plate 10 at a distance of 9 mm from the ground plate 10 of 300 mm × 300 mm Fold by 8 mm toward the ground plate 10 parallel to the 90 mm edges at predetermined intervals along the 46 mm edges of the patch 20 to form 11 protrusions 24 and protrusions formed at both ends ( 24 is folded by 6mm and then folded horizontally by 3mm in parallel with the ground plate 10 to form a horizontal portion 26, connecting the feed line 32 and the feed member 30 by a small microstrip according to the present invention Example 3 of a patch antenna was prepared.

The reflection loss and the radiation pattern were measured using Example 3 manufactured as described above, and are shown in FIGS. 21 and 22, respectively.

Example 4

As shown in (a) and (b) of FIG. 23, a patch 20 of 90 mm × 29 mm is placed at the center of the ground plate 10 at a distance of 9 mm from the ground plate 10 of 300 mm × 300 mm. Fold by 8 mm toward the ground plate 10 parallel to the 90 mm edges at predetermined intervals along the 29 mm edges of the patch 20 to form 11 protrusions 24 and protrusions formed at both ends ( 24 is folded by 6mm and then folded horizontally by 3mm in parallel with the ground plate 10 to form a horizontal portion 26, connecting the feed line 32 and the feed member 30 by a small microstrip according to the present invention Example 4 of a patch antenna was prepared.

The reflection loss and the radiation pattern were measured using Example 4 manufactured as described above, and are shown in FIGS. 24 and 25, respectively.

Comparative Example 1

As shown in Figs. 26 (a) and 26 (b), a patch 4 of 90 mm × 82 mm is placed at the center of the ground plate 2 at a distance of 9 mm from a ground plate 2 of 128 mm × 100 mm. , Comparative Example 1 of a microstrip patch antenna was prepared by connecting the feed line 6 and the feed member 8.

The reflection loss and the radiation pattern were measured using Comparative Example 1 prepared as described above, and are shown in FIGS. 27 and 28, respectively.

Comparative Example 2

As shown in Figs. 29 (a) and (b), a patch 4 of 90 mm x 81.5 mm is placed at the center of the ground plate 2 at a distance of 9 mm from a ground plate 2 of 300 mm x 300 mm. Then, the feed line 6 and the feed member 8 were connected to prepare Comparative Example 2 of the microstrip patch antenna.

The reflection loss and the radiation pattern were measured using Comparative Example 2 prepared as described above, and are shown in FIGS. 30 and 31, respectively.

Comparing the return loss and the radiation pattern of Example 1 and Comparative Example 1, as shown in Figs. 15 and 27 at 6.47% (102MHz) compared to 5.65% (89MHz) of Comparative Example 1 at the center frequency of 1.575GHz- It can be seen that the 10dB bandwidth is wider in the case of Example 1, and the -3dB beamwidth is 92 ° in the E-plane, which is wider than 64 ° in Comparative Example 1, as shown in FIGS. 16 and 28. In addition, in the case of Example 1, the ground plate 10 is narrower than that of Comparative Example 1, so that the gain tends to decrease and the rear lobe level increases, but the radiation pattern is similar.

Comparing Example 1 and Comparative Example 1, in Comparative Example 1 in the length of the non-radiation slot, while Comparative Example 1 is 82mm while Example 1 is 48mm, the length reduction effect of approximately 41.5% is obtained, it can be confirmed that the miniaturization by that Can be.

And comparing the return loss and the radiation pattern of Example 2, Example 3, Example 4 and Comparative Example 2, 6.2% (99MHz) of Comparative Example 2 as shown in Figure 18, 21, 24 and 30 Compared with, at 6.5% (103MHz) and 6.3% (100MHz), the -10dB bandwidth at the center frequency 1.575GHz is slightly wider for Examples 2 and 3 and 3.3% (53MHz) for Example 4. It is narrower, and as shown in FIGS. 19, 22, 25, and 31, the -3 dB beamwidth is 111.94 °, 112.4 °, and 154.1 ° in the E-plane, which is wider than 56.16 ° of Comparative Example 2. . In addition, in the case of Examples 2, 3, and 4, the ground plate 10 was narrower than that of Comparative Example 2, but the gain tended to decrease, but the radiation pattern was similar.

Comparing Example 2, Example 3, and Example 4 with Comparative Example 2, in Comparative Example 2 in the length of the non-radiative slot, while Example 2 is 40mm, Example 3 is 46mm, Example 4 Since it is 29mm, length reduction effect of about 50.9%, 43.5%, and 64.42% is obtained, and it can be confirmed that miniaturization is possible.

32 shows the measurement of the change in the resonant frequency as the number of protruding pieces 24 and 14 formed in the patch 20 or the ground plate 10 is increased.

As shown in FIG. 32, when the protrusion pieces 14 are formed on the ground plate 10, as the number of the protrusion pieces 14 increases, the resonance frequency decreases and then increases again beyond 16 (0.92 GHz). Showed a tendency. Therefore, the number of protrusions 14 formed on the ground plate 10 is preferably set to 16 or less, and the optimum number of protrusions 14 is made in view of the manufacturing cost that increases as the number of protrusions 14 increases. It is preferable to set. In addition, in the case of forming the protruding piece 24 in the patch 20, the number of the protruding pieces 24 exceeded 11 (1.14 GHz), and the resonant frequency tended to increase again.

In the above, a preferred embodiment of the small microstrip patch antenna according to the present invention has been described, but the present invention is not limited thereto, and various modifications can be made within the scope of the claims and the detailed description of the invention and the accompanying drawings. This also belongs to the scope of the present invention.

According to the small microstrip patch antenna according to the present invention as described above, since the actual surface area can be increased in the same size by providing a plurality of protruding pieces in the patch and / or ground plate, in the case of having the same center frequency As it can be miniaturized and lightweight, it is very easy to apply to information communication devices such as mobile phones, PDAs and GPS.

In addition, even when the same dielectric is used and manufactured in the same size, since the protrusions may be installed to have a set center frequency required in various ways, the impedance may be matched, thus eliminating the need for using a dielectric having a high dielectric constant and reducing manufacturing costs.

Claims (10)

A ground plate formed in a predetermined shape, a patch installed at a predetermined distance from the ground plate and connected to a feed line, a dielectric layer provided between the ground plate and the patch, and arranged at predetermined intervals on the patch It includes a plurality of protrusions are installed at the height of, The protruding piece is a small microstrip patch antenna arranged in a predetermined interval parallel to the radiation slot of the patch to be installed long. A ground plate formed in a predetermined shape, a patch installed at a predetermined distance from the ground plate and connected to a feed line, a dielectric layer provided between the ground plate and the patch, and arranged at predetermined intervals on the ground plate It includes a plurality of protrusions protruding to a predetermined height toward the patch, The protruding piece is a small microstrip patch antenna arranged in a predetermined interval parallel to the radiation slot of the patch to be installed long. A ground plate formed in a predetermined shape, a patch installed at a predetermined distance from the ground plate and connected to a feed line, a dielectric layer provided between the ground plate and the patch, and the ground plate and the patch at predetermined intervals. Comprising a plurality of protruding pieces arranged in a zigzag manner arranged so as to protrude to a predetermined height toward each other and do not short each other, The protruding piece is a small microstrip patch antenna arranged in a predetermined interval parallel to the radiation slot of the patch to be installed long. delete The method according to any one of claims 1 to 3, The protruding piece is a small microstrip patch antenna arranged in a predetermined interval in the horizontal and vertical to form a grid. The method according to any one of claims 1 to 3, The projecting piece is a small microstrip patch antenna formed in a concentric shape arranged at a predetermined interval along the edge of the patch. The method according to any one of claims 1 to 3, The protruding pieces are small microstrip patch antennas comprising a plurality of protrusions continuously formed by setting an interval between protrusions formed in a row to be equal to or less than 1/10 of a wavelength. The method according to any one of claims 1 to 3, The small microstrip patch antenna to form a protruding piece by vertically folding the edge of the ground plate along the side of the patch. The method according to any one of claims 1 to 3, A small microstrip patch antenna that folds the edge of the ground plate in a double "D" shape along the side and the top surface of the patch to form a vertical protrusion and a horizontal top surface. The method according to any one of claims 1 to 3, Small microstrip patch antenna to form a horizontal portion by folding in a direction parallel to the ground plate from the protruding piece formed on the edge of the patch.

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