KR100652227B1 - Microstrip antenna using L-shaped plates - Google Patents

Abstract

The present invention relates to a microstrip antenna using an L-shaped plate, which is visible by increasing the current path at the bottom of the patch by attaching an L-shaped plate to the bottom of the patch of a general linearly polarized microstrip patch antenna for miniaturization of the antenna. A rectangular planar patch to increase the resonance length and to induce a downward frequency of the resonance frequency; A plurality of plates attached at equal intervals to the underside of the planar patch as an el-shaped shape having a predetermined width; And a dielectric to fill each void formed between the plates so that each of the plates maintains a circular shape. It includes.

According to the present invention, there is an effect of providing a microstrip antenna using an L-shaped plate that can be manufactured at low cost, as well as light weight, low volume, and low layer.

L-shaped, microstrip, antenna, dielectric

Description

Microstrip antenna using L-shaped plates

1 is a perspective view of a conventional microstrip broadband antenna.

Figure 2a is a photograph of a microstrip antenna using the L-shaped plate according to an embodiment of the present invention.

Figure 2b is a plan view of a microstrip antenna using the L-shaped plate according to an embodiment of the present invention.

Figure 2c is a photographic view of a microstrip antenna using another L-shaped plate according to an embodiment of the present invention.

Figure 2d is a plan view of a microstrip antenna using another L-shaped plate according to an embodiment of the present invention.

Figure 2e is a bottom view of the microstrip antenna using the L-shaped plate according to an embodiment of the present invention.

Figure 2f is a plan view of a microstrip antenna using another el-shaped plate according to an embodiment of the present invention.

3 is a graph showing a change in resonant frequency with increasing number of L-shaped plates according to an embodiment of the present invention.

Figure 4a is a plan view and a side view of a microstrip antenna using the L-shaped plate indicating the feed point position in accordance with an embodiment of the present invention.

Figure 4b is a graph showing the reflection loss characteristics according to the feed point position in accordance with an embodiment of the present invention.

FIG. 5A is a plan view and a side view showing the structure of a microstrip antenna with fourteen el-shaped plates optimized for 1.575 GHz according to one embodiment of the present invention; FIG.

FIG. 5B is a graph showing return loss characteristics of a microstrip antenna having 14 L-shaped plates optimized for 1.575 GHz according to an embodiment of the present invention. FIG.

FIG. 5C is a graph showing a radiation pattern of a microstrip antenna with 14 L-shaped plates optimized for 1.575 GHz according to an embodiment of the present invention. FIG.

FIG. 6A is a perspective view illustrating the structure of a circularly polarized L-shaped plate microstrip antenna having four L-shaped plates optimized for 1.575 GHz according to an embodiment of the present invention; FIG.

6B is a graph showing the axial ratio of a circularly polarized L-shaped plate microstrip antenna with four L-shaped plates optimized for 1.575 GHz according to one embodiment of the present invention.

FIG. 6C is a graph showing an x-axis parallel polarization radiation pattern of a circularly polarized L-shaped plate microstrip antenna with four L-shaped plates optimized for 1.575 GHz according to an embodiment of the present invention. FIG.

FIG. 6D is a graph showing a y-axis parallel polarization radiation pattern of a circularly polarized L-shaped plate microstrip antenna with four EL-shaped plates optimized for 1.575 GHz according to an embodiment of the present invention. FIG.

7A is a perspective view of an L-shaped plate microstrip antenna for impedance change measurement according to a feed point movement according to an embodiment of the present invention.

7B is a graph showing a change in resistance value in impedance change according to a feed point movement according to an embodiment of the present invention.

7C is a graph showing a change in reactance value in impedance change according to a feed point movement according to an embodiment of the present invention.

8A is a plan view showing the structure of a circularly polarized L-shaped plate microstrip antenna to which 13 L-shaped plates optimized for 1.575 GHz are attached according to an embodiment of the present invention.

8B is a graph showing the axial ratio of the structure of a circularly polarized L-shaped plate microstrip antenna to which 13 EL-shaped plates optimized for 1.575 GHz are attached according to an embodiment of the present invention.

FIG. 8C is a graph showing an x-axis parallel polarization radiation pattern of a circularly polarized el-shaped plate microstrip antenna to which thirteen el-shaped plates optimized for 1.575 GHz according to an embodiment of the present invention. FIG.

FIG. 8D is a graph showing a y-axis parallel polarization radiation pattern of a circularly polarized L-shaped plate microstrip antenna to which 13 EL-shaped plates optimized for 1.575 GHz according to an embodiment of the present invention are attached. FIG.

The present invention relates to a microstrip antenna using an L-shaped (L-shaped) plate, and more particularly, in order to miniaturize the antenna by attaching an el-shaped plate to the bottom of the patch of a general linearly polarized microstrip patch antenna The present invention relates to a microstrip antenna using an L-shaped plate for increasing the visible resonance length by increasing the current path at the bottom of the patch to induce a downward frequency of the resonance frequency.

Conventionally, in relation to the microstrip antenna, a number of applications and registrations other than the Republic of Korea Utility Model Publication No. 1989-0001581 'microstrip broadband antenna'.

As shown in FIG. 1, the microstrip broadband antenna forms a ground plane 3 and a microstrip conductor 4 on a single dielectric substrate 1, and the ground plane 3 and the microstrip conductor ( The microstrip line 7 formed by 4) is connected to the microwave radiator 6, i.e., the upper conductor 2 and the lower conductor 5, so that the tapering is performed on the line to operate as an effective antenna over a wide frequency band. ) Is a structure.

However, the microstrip broadband antenna has a large volume, a small gain, and a circuit under the ground plane, which makes it impossible to miniaturize the system and makes it difficult to manufacture a circularly polarized wave and thus cannot be used in a portable radio communication device. There was this.

An object of the present invention is to solve the above problems, and to provide a microstrip antenna using an L-shaped plate that is not only lightweight, low volume, low-layer type, but also can be manufactured at low cost.

The present invention for achieving the above object, relates to a microstrip antenna using the L-shaped plate, a rectangular planar patch; A plurality of plates attached at equal intervals to the underside of the planar patch as an el-shaped shape having a predetermined width; And a dielectric to fill each void formed between the plates so that each of the plates maintains a circular shape. It includes.

Preferably the planar patch and plate is characterized in that composed of a metallic material.

Also preferably, each of the plurality of plates may be attached at right angles to the planar patch.

Also preferably, at least one of the plurality of plates is attached to the planar patch in a state symmetrically cut by a predetermined length around the bent portion.

Also preferably, each of the plurality of plates is characterized by consisting of a plurality of pins.

Also preferably, the dielectric is a laminated structure.

Preferably, the planar patch is integrated with a power feeding structure.

Hereinafter, with reference to the accompanying drawings will be described in detail the present invention.

The structure of a microstrip antenna using an L-shaped plate according to an embodiment of the present invention will be described with reference to FIGS. 2A to 2E.

2A is a photographic view of a microstrip antenna using an L-shaped plate according to an embodiment of the present invention, and FIG. 2B is a plan view of a microstrip antenna using an L-shaped plate according to an embodiment of the present invention. 2C is a photograph of a microstrip antenna using another L-shaped plate according to an embodiment of the present invention, and FIG. 2D is a microstrip antenna using another EL-shaped plate according to an embodiment of the present invention. 2E is a bottom view photograph of a microstrip antenna using an L-shaped plate according to an embodiment of the present invention, and FIG. 2F is a micrograph using another EL-shaped plate according to an embodiment of the present invention. Top view of the strip antenna.

2A and 2B, the microstrip antenna using an L-shaped plate according to an embodiment of the present invention includes a planar patch 10, a plurality of plates 20, and a dielectric 30.

The flat patch 10 is a metal material and is set to have a size of 47 mm × 47 mm in the present embodiment, but the present invention is not limited thereto, and the flat patch as shown in FIG. It is also possible to set so that the power supply structure 1 is integrated.

In addition, each of the plates 20 is a metal material and has an overall el-shaped shape with a predetermined width, and is attached to the planar patch at right angles to the bottom surface of the planar patch.

In the present embodiment, the plate has an el-shaped shape that is not cut, the number thereof is 13, and the width is set to 8 mm, but the present invention is not limited thereto. 2C and 2D, at least one of the plurality of plates may be set to be attached to the planar patch in a state in which the plate is cut by a predetermined length symmetrically about the bent portion. As shown in FIG. 2F, it is also possible to set the plate to be formed of a plurality of pins.

In addition, the dielectric 30 performs a function of maintaining the circular shape of each plate by filling empty spaces formed between the plates as shown in FIG. 2E. It is also possible to replace the dielectric with an air layer.

In this embodiment, the dielectric material has a dielectric constant epsilon _r of 1.06 and a thickness of 9 mm, but the present invention is not limited thereto.

The measurement results of the properties of the microstrip antenna using the L-shaped plate according to the exemplary embodiment having the above-described configuration will be described with reference to FIGS. 3 to 8D.

3 is a graph showing a change in the resonant frequency according to the increase in the number of the el-shaped plate according to an embodiment of the present invention, Figure 4a is an el-shaped plate showing the feed point position according to an embodiment of the present invention 4 and 4b are graphs showing reflection loss characteristics according to feed point positions according to an embodiment of the present invention, and FIG. 5a is optimized for 1.575 GHz according to an embodiment of the present invention. FIG. 5B is a plan view and a side view showing the structure of the microstrip antenna to which 14 L-shaped plates are attached. FIG. 5B shows a microstrip antenna to which 14 L-shaped plates are optimized to 1.575 GHz according to an embodiment of the present invention. 5C is a graph showing return loss characteristics, and FIG. 5C is a graph showing 14 L-shaped plates optimized for 1.575 GHz according to an embodiment of the present invention. 6A is a graph illustrating a radiation pattern of a low strip antenna, and FIG. 6A is a perspective view illustrating a structure of a circularly polarized L-shaped plate microstrip antenna having four L-shaped plates optimized for 1.575 GHz according to an embodiment of the present invention. 6B is a graph showing the axial ratio of a circularly polarized L-shaped plate microstrip antenna to which four L-shaped plates optimized for 1.575 GHz according to an embodiment of the present invention are attached, and FIG. 6C is an embodiment of the present invention. FIG. 6D is a graph illustrating an x-axis parallel polarization radiation pattern of a circularly polarized el-shaped plate microstrip antenna having four el-shaped plates optimized for 1.575 GHz according to an embodiment, and FIG. The y-axis parallel polarization radiation pattern of the circularly polarized el-shaped plate microstrip antenna with four el-shaped plates optimized for 1.575 GHz Figure 7a is a perspective view of the L-shaped plate microstrip antenna for measuring the impedance change according to the feeding point movement according to an embodiment of the present invention, Figure 7b is a feed point movement according to an embodiment of the present invention FIG. 7C is a graph illustrating a change in reactance value in impedance change according to a movement of a feed point according to an embodiment of the present invention, and FIG. 8A is a graph illustrating change in resistance value according to an embodiment of the present invention. According to an example, a plan view showing the structure of a circularly polarized L-shaped plate microstrip antenna having 13 L-shaped plates optimized for 1.575 GHz is shown, and FIG. 8B is an EL optimized optimized for 1.575 GHz according to an embodiment of the present invention. A graph showing the axial ratio of the structure of a circularly polarized L-shaped plate microstrip antenna with 13 magnetic plates 8C is a graph showing an x-axis parallel polarization radiation pattern of a circularly polarized L-shaped plate microstrip antenna to which 13 EL-shaped plates optimized for 1.575 GHz according to an embodiment of the present invention are attached, and FIG. 8D is According to an embodiment of the present invention, a graph showing the y-axis parallel polarization radiation pattern of a circularly polarized el-shaped plate microstrip antenna to which 13 el-shaped plates optimized for 1.575 GHz are attached.

As shown in FIG. 3, the resonant frequency was lowered as the number of el-shaped plates increased, and when the number of el-shaped plates was 18, 39.4% of the resonant frequency was obtained at 955 MHz (measured value). This is a change as the path of current is increased by el-shaped plates attached at equal intervals on the underside of the patch.

However, it can be seen that since the number of L-shaped plates is 14, the resonant frequency downward curve is slowed and the downward rate decreases. This is because when the gap between the plates is narrower than 0.03 wavelength (for 14 L-shaped plates), current does not flow between the plates and a current draft phenomenon occurs from the plate edge to the neighboring edge.

A general microstrip antenna feeds on a center line of the width, but diagonal feeding is performed in a microstrip antenna using an L-shaped plate according to an embodiment of the present invention.

As shown in FIG. 4A and FIG. 4B, when the L-shaped plates are seven, the resonant frequency change according to the feeding position is greater than the plate around the feeding point when the feeding point is the first position. Because of the longer current path, the effect of increasing the current path is more effective, resulting in a higher frequency down rate.

5A to 5C illustrate the structure, reflection loss, and radiation pattern of an antenna optimized at 1.575 GHz when 14 L-shaped plates are considered to be saturated with a resonant frequency downward curve according to the number of plate attachments.

At this time, the size of the antenna was 47 mm × 47 mm, which was 43.4% shorter than the flat linearly polarized microstrip patch antenna (83 mm × 83 mm), which was reduced by 36 mm in width and length, respectively. 34.4 dB, -10 dB bandwidth of 49 MHz (3.1%) showed good characteristics.

As shown in FIG. 5C, as a result of measuring the x-axis polarization radiation pattern on the zx plane, the gain was 1.19 dBd and the -3 dB beamwidth was 127 °. As a result of the x-axis polarization radiation pattern measurement on the zy plane, the beam width was -3 dB. Was 93 °.

In the structure shown in FIG. 5A, circular polarization was obtained by varying the width and length of the antenna, but separation of polarization was difficult.

In order to facilitate the polarization separation, as shown in Figures 6a to 6d, the bent portion of the four L-shaped plate was opened.

At this time, the size of the circularly polarized microstrip antenna was 60 mm x 68 mm, indicating an area reduction rate of 35.3% compared to the planar circularly polarized microstrip patch antenna (length 76 mm × width 83 mm).

The -10 dB bandwidth is 145 MHz (9.2%), the axis ratio is 0.68 dB at the center frequency of 1.575 GHz, and the bandwidth below 2 dB is 39 MHz (2.5%).

As shown in FIG. 6C, the gain of the x-axis parallel polarization is 1.26 dBd, the -3 dB beamwidth is 82 ° in the zx plane, and 86 ° in the zy plane, and the y-axis parallel polarization is shown in FIG. 6D. In this case, the -3dB beamwidth is represented by 82 ° in the zx plane and 92 ° in the zy plane.

The circular polarization axial ratio characteristic of the antenna varies greatly depending on the opening and non-opening of the bent portion. To confirm this, the impedance change according to the position of each feed point in the structure as shown in FIG. 7A was examined.

Opening and unopening of the bent portions of the plate 1 and the plate 2 at the center frequency of 1.575 GHz, the change in the resistance value and the reactance value of the impedance was investigated.

As shown in FIG. 7B, the smallest change amount of the resistance value is shown when the plate 2 is opened, and the smallest change amount of the reactance value is shown when the plate 1 is opened as shown in FIG. 7C.

In addition, when both plate 1 and plate 2 were opened, the resistance values showed a stable change, but became slightly higher, such as 90 Ω. This may be due to the relatively open side deflection effect as the plate is removed. The advantage, however, is that the intersection of the two resonant frequencies is somewhat higher in impedance, but it can never be disadvantageous to satisfy the circular polarization condition.

Also, the reactance value is increased due to the condenser component, which is due to the shortening of the antenna. When increasing the number of L-shaped plates, the gap between the L-shaped plates is narrowed and the impedance is expected to vary greatly depending on the position of the feed point.The L-shaped plate around the feed point opens the bent part. To optimize.

8A to 8D, the structure, the axial ratio, and the radiation pattern of the 13 L-shaped circularly polarized microstrip antennas optimized at the center frequency of 1.575 GHz are shown.

At this time, the size of the circularly polarized microstrip antenna was 53 mm x 54 mm, indicating an area reduction rate of 54.6% compared to the planar circularly polarized microstrip patch antenna (length 76 mm × width 83 mm).

The -10 dB bandwidth was 99 MHz (6.3%), the axis ratio was 1.37 dB at the center frequency of 1.575 GHz, and the bandwidth below 2 dB was 14 MHz (0.8%).

In the case of x-axis parallel polarization as shown in FIG. 8C, the gain is 1.36 dBd, -3 dB beamwidth is shown as 109 ° in the zx plane and 98 ° in the zy plane, and in the case of y-axis parallel polarization as shown in FIG. 8D. The gain is 0.7 dBd and the -3dB beamwidth is 92 ° on the zx plane and 116 ° on the zy plane.

As described above, the microstrip antenna using the El-shaped plate according to the embodiment of the present invention miniaturized the linearly and circularly polarized microstrip antenna using the El-shaped plate.

Increasing the number of plates increased the current path by the length of the attached L-shaped plate, which lowered the resonance frequency. As a result, the linearly polarized antenna has a 43.4% reduction in length and width when optimized with 14 L-shaped plates, and the circularly polarized antenna has a 54.6% area reduction ratio and 1.37 dB when optimized with 13 L-shaped plates. And a good circular polarization characteristic with a bandwidth of 14 MHz with an axial ratio of 2 dB or less.

Experiments confirmed that the impedance change of the feed point is insensitive when the bent part of the plate is open when optimizing the circularly polarized antenna. As a result, it was confirmed that the microstrip antenna using the L-shaped plate is suitable for miniaturization in both linear polarization and circular polarization.

The present invention described above is capable of various substitutions, modifications, and changes without departing from the spirit of the present invention for those skilled in the art to which the present invention pertains. It is not limited to the drawing.

According to the present invention as described above, there is an effect that can provide a microstrip antenna using an L-shaped plate that can be manufactured at low cost, as well as light weight, low volume, low layer.

Claims (7)

In the microstrip antenna using the L-shaped plate, Rectangular planar patches; A plurality of plates attached at equal intervals to the underside of the planar patch as an el-shaped shape having a predetermined width; And A dielectric that allows each of the plates to maintain a circular shape by filling in the voids formed between the plates; Microstrip antenna using an el-shaped plate comprising a. The method of claim 1, The planar patch and plate is a microstrip antenna using an el-shaped plate, characterized in that composed of a metallic material. The method of claim 1, Each of the plurality of plates, Microstrip antenna using the L-shaped plate, characterized in that attached to the planar patch at a right angle. The method of claim 1, And at least one of the plurality of plates is attached to the planar patch in a state in which at least one of the plurality of plates is symmetrically cut about the bent portion by a predetermined length. The method of claim 1, Each of the plurality of plates, Microstrip antenna using the L-shaped plate, characterized in that consisting of a plurality of pins. The method of claim 1, The dielectric is, Microstrip antenna using the L-shaped plate, characterized in that the laminated structure. The method of claim 1, The flat patch, A microstrip antenna using an L-shaped plate, which is integrated with a feeding structure.

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