KR102151120B1 - A shared-aperture dual-broadband microstrip patch antenna using a cross patch - Google Patents

Abstract

Provided is a dual-broadband microstrip patch antenna of a shared-aperture opening portion using a cross patch, which comprises: an S-band stack patch formed in a cross shape on an upper surface of a first substrate; an S-band radiation patch formed in a cross shape overlapping the S-band stack patch on an upper surface of a second substrate coupled to a lower surface of the first substrate; an S-band antenna including an S-band feed line partially overlapping the S-band stack patch and the S-band radiation patch on an upper surface of a third substrate coupled to a lower surface of the second substrate; a plurality of X-band stack patches arranged in a matrix shape on the upper surface of the first substrate; a plurality of X-band radiation patches arranged in a matrix shape overlapping the X-band stack patches on the upper surface of the third substrate; an X-band antenna including X-band feeding networks formed on a lower surface of a fourth substrate coupling to the lower surface of the third substrate; and a ground plane attached to the upper surface of the fourth substrate and having a plurality of opening portions overlapping common with the X-band stack patches and the X-band radiation patches. Accordingly, a dual-band antenna having broadband characteristics and excellent radiation characteristics can be implemented.

Description

Common opening dual broadband microstrip patch antenna using cross patch {A SHARED-APERTURE DUAL-BROADBAND MICROSTRIP PATCH ANTENNA USING A CROSS PATCH}

The present invention relates to a common opening dual broadband microstrip patch antenna using a cross patch, and more particularly, a new common opening microstrip patch operating in a dual band of S-band and X-band having a simple structure and broadband characteristics. It relates to the antenna.

Next-generation antennas need an antenna that can use multiple bands and must be able to provide various frequency ratios. Accordingly, several studies are being conducted.

One of them is a dual-band common aperture antenna using a perforated patch antenna. A common aperture dual band antenna using a perforated patch can reduce the overall physical size of the dual band antenna by configuring the antenna operating in two bands on one antenna aperture. Many studies have been conducted on dual-band antennas using such a structure.

However, the dual band antenna using the perforated patch has a disadvantage in that the design space of the high frequency band antenna is limited due to the limit of the size of the perforated patch antenna, which is a low frequency band antenna. Also, due to the limitations of the structure, the frequency ratio of the operating band cannot be freely designed.

As another method, in order to extend the bandwidth of the patch antenna, a study was conducted using a substrate having a low dielectric constant and increasing the thickness of the substrate. Using these studies, a method of using a honeycomb substrate with a dielectric constant close to 1 was studied to expand the bandwidth of the common aperture antenna. In this case, if the L-band had 6.4% bandwidth, the C-band had 7.3% bandwidth.

However, a substrate with a dielectric constant close to 1 cannot use the thermal bonding method during the antenna manufacturing process, increasing the manufacturing complexity. When an air layer having a dielectric constant of 1 is used, an additional substrate for the radiation patch is required, which increases the cost. In addition, since a structure between the substrate and the substrate is required for the air layer, the antenna structure is bound to have a weak structure.

Accordingly, research on an antenna having broadband characteristics and excellent radiation characteristics is required.

KR 1174825 B1 KR 2000-0020274 A JP 2009-89217 A

Accordingly, the technical problem of the present invention is conceived in this respect, and an object of the present invention is to provide a dual broadband microstrip patch antenna with a common opening using a cross patch using a cross patch having a broadband characteristic and excellent radiation characteristics.

A common opening dual broadband microstrip patch antenna using a cross patch according to an embodiment for realizing the object of the present invention includes: an S-band stack patch formed in a cross shape on an upper surface of a first substrate; An S-band radiation patch formed in a cross shape overlapping the S-band stack patch on an upper surface of a second substrate coupled to a lower surface of the first substrate; And an S-band feed line partially overlapping the S-band stack patch and the S-band radiation patch on an upper surface of a third substrate coupled to a lower surface of the second substrate. A plurality of X-band stack patches arranged in a matrix shape on an upper surface of the first substrate; A plurality of X-band radiation patches arranged in a matrix shape overlapping the X-band stack patches on an upper surface of the third substrate; And an X-band power supply network formed on a lower surface of the fourth substrate coupled to the lower surface of the third substrate. And a ground plane attached to the upper surface of the fourth substrate and having a plurality of openings overlapping in common with the X-band stack patches and the X-band radiation patches.

In an embodiment of the present invention, the S-band radiation patch is formed to overlap with respect to the same center as the S-band stack patch, and the width of the S-band radiation patch is the same as the S-band stack patch, , The length of the S-band radiation patch may be longer than that of the S-band stack patch.

In an embodiment of the present invention, the X-band stack patches may be formed in a 2×2 arrangement between the cross blades of the S-band stack patch.

In an embodiment of the present invention, the X-band radiation patches are formed in a 2×2 arrangement overlapping each of the X-band stack patches, and each X-band radiation patch is larger than each corresponding X-band stack patch. It can be largely formed.

In an embodiment of the present invention, the plurality of openings may be formed in a 2×2 arrangement overlapping in common with the X-band stack patches and the X-band radiation patches.

In an embodiment of the present invention, the plurality of openings may be formed in an H shape.

In an embodiment of the present invention, the S-band feed line may be formed in a multi-stage line shape having different lengths and widths.

In an embodiment of the present invention, the X-band power supply network includes: a power divider for distributing power supplied from one port in another direction; And a phase shifter connected from the power divider to feed power to the X-band radiation patches in the opposite direction.

A dual broadband microstrip patch antenna with a common opening using a cross patch according to an embodiment for realizing another object of the present invention described above includes an S-band stack patch formed in a cross shape on an upper surface and a plurality of X -A first substrate on which band stack patches are formed; A second substrate coupled to a lower surface of the first substrate and having an S-band radiation patch formed on an upper surface thereof in a cross shape overlapping the S-band stack patch; A plurality of matrix shapes that are coupled to the lower surface of the second substrate and overlap the S-band feed line and the X-band stack patches partially overlapping the S-band stack patch and the S-band radiation patch on the upper surface. A third substrate on which X-band radiation patches are formed; And a ground plane coupled to a lower surface of the third substrate and having a plurality of openings overlapping in common with the X-band stack patches and the X-band radiation patches on an upper surface, and an X-band power supply network formed on a lower surface thereof. Includes 4 substrates.

In an embodiment of the present invention, the S-band radiation patch is formed to overlap with respect to the same center as the S-band stack patch, and the width of the S-band radiation patch is the same as the S-band stack patch, , The length of the S-band radiation patch may be longer than that of the S-band stack patch.

In an embodiment of the present invention, the X-band stack patches are formed in a 2×2 arrangement between the cross blades of the S-band stack patch, and the X-band radiation patches are each of the X-band stack patches. Are formed in a 2x2 arrangement overlapping with each other, and each X-band radiating patch may be formed larger than a corresponding respective X-band stacked patch.

In an embodiment of the present invention, the plurality of openings may be formed in a 2×2 arrangement overlapping in common with the X-band stack patches and the X-band radiation patches.

In an embodiment of the present invention, the plurality of openings may be formed in an H shape.

In an embodiment of the present invention, the S-band feed line may be formed in a multi-stage line shape having different lengths and widths.

In an embodiment of the present invention, the X-band power supply network includes: a power divider for distributing power supplied from one port in another direction; And a phase shifter connected from the power divider to feed power to the X-band radiation patches in the opposite direction.

According to the dual broadband microstrip patch antenna with a common opening using a cross patch, it has broadband characteristics and excellent radiation characteristics in a dual band by using a cross patch antenna, and reduces the number of substrates used to obtain a dual broadband antenna at a lower cost. Can be implemented.

1 is an overall structural diagram of a dual broadband microstrip patch antenna with a common opening using a cross patch according to an embodiment of the present invention.
2 is a plan view of an upper surface of the first substrate of FIG. 1.
3 is a plan view of an upper surface of the second substrate of FIG. 1.
4 is a plan view of an upper surface of the third substrate of FIG. 1.
5 is a plan view of a ground plane formed on the upper surface of the fourth substrate of FIG. 1.
6 is a plan view of an X-band power supply network formed on a lower surface of the fourth substrate of FIG. 1.
7 is a plan view of the S-band antenna of FIG. 1.
8 is a perspective view of the S-band antenna of FIG. 1.
9 is a plan view of the X-band unit antenna of FIG. 1.
10 is a perspective view of an X-band unit antenna of FIG. 1.
11 is an enlarged view of the X-band power supply network of FIG. 6.

DETAILED DESCRIPTION OF THE INVENTION The detailed description of the present invention to be described later refers to the accompanying drawings, which illustrate specific embodiments in which the present invention may be practiced. These embodiments are described in detail sufficient to enable a person skilled in the art to practice the present invention. It is to be understood that the various embodiments of the present invention are different from each other, but need not be mutually exclusive. For example, specific shapes, structures, and characteristics described herein may be implemented in other embodiments without departing from the spirit and scope of the present invention in relation to one embodiment. In addition, it is to be understood that the location or arrangement of individual components within each disclosed embodiment may be changed without departing from the spirit and scope of the present invention. Accordingly, the detailed description to be described below is not intended to be taken in a limiting sense, and the scope of the present invention, if appropriately described, is limited only by the appended claims, along with all scopes equivalent to those claimed by the claims. Like reference numerals in the drawings refer to the same or similar functions over several aspects.

Hereinafter, preferred embodiments of the present invention will be described in more detail with reference to the drawings.

1 is an overall structural diagram of a dual broadband microstrip patch antenna with a common opening using a cross patch according to an embodiment of the present invention. 2 is a plan view of an upper surface of the first substrate of FIG. 1. 3 is a plan view of an upper surface of the second substrate of FIG. 1. 4 is a plan view of an upper surface of the third substrate of FIG. 1. 5 is a plan view of a ground plane formed on the upper surface of the fourth substrate of FIG. 1. 6 is a plan view of an X-band power supply network formed on a lower surface of the fourth substrate of FIG. 1.

The common opening dual broadband microstrip patch antenna (10, hereinafter referred to as antenna) using a cross patch according to the present invention is a broadband common opening patch antenna combining an S-band cross antenna and an X-band antenna designed in a 2×2 array. This study describes a design method of a dual broadband microstrip patch antenna with a common opening using a cross patch with excellent radiation characteristics.

Specifically, in order to have broadband characteristics in the S-band, a new S-band close-coupled feed patch antenna that uses a cross-radiation patch and a cross-stack patch and integrates an impedance matcher in the feed line, and 2 to have broadband characteristics in the X-band. A stack patch arranged in ×2 and an opening-coupled feeding X-band patch antenna having an antenna patch below it are vertically coupled to have a common opening.

The antenna 10 according to the present invention uses a cross-stacked patch antenna as a low-frequency band antenna, and can have various frequency ratios compared to a conventional antenna, and a degree of design freedom is large. In addition, the dual broadband antenna with a common opening designed using the method proposed in the present invention has broadband characteristics of 20% and 40% or more, respectively, in a low frequency band and a high frequency band, and has excellent radiation characteristics.

Referring to FIG. 1, the antenna 10 according to the present invention uses four substrates of a first substrate 11, a second substrate 12, a third substrate 13, and a fourth substrate 14, It includes a vertically coupled S-band proximity coupling feed patch antenna (100, hereinafter referred to as S-band antenna) and an X-band opening coupling feed patch antenna (300, hereinafter referred to as X-band antenna).

For example, the size of the antenna 10 is 77.7 mm × 54 mm × 10.32 mm.

The S-band antenna 100 includes a cross-stack patch 110, a cross-radiation patch 130, and a feed line 150 for impedance matching with these, and is a single antenna that operates by receiving a single input. The stack patch 110 and close-coupled power supply are used.

The X-band antenna 300 is unit antennas constituting a 2×2 array, and each unit antenna is composed of stack patches 311, 312, 313, 314 and antenna patches 331, 332, 333, and 334. Use opening-coupled feed.

In one embodiment, all of the first substrate 11, the second substrate 12, the third substrate 13, and the fourth substrate 14 have a dielectric constant of 2.2 and a loss tangent of 0.0009. TLY-5 can be used. Such a substrate configuration increases the mechanical strength and convenience of manufacturing the antenna, and prevents an increase in thickness and cost due to an air substrate (air layer).

For example, the first substrate 11, the second substrate 12, and the third substrate 13 may have a thickness of 3.18 mm, and the fourth substrate 14 may have a thickness of 0.78 mm. .

1 and 2, an S-band stack patch 110 formed in a cross shape and a plurality of X-band stack patches 311 and 312 arranged in a matrix shape on the upper surface of the first substrate 11 313, 314) are formed. The S-band stack patch 110 and the X-band stack patches 311, 312, 313, and 314 do not overlap each other.

The X-band stack patches 311, 312, 313, 314 are formed in a 2×2 arrangement between the cross blades of the S-band stack patch 110, and may be formed in, for example, a rectangular shape. have.

1 and 3, the second substrate 12 is vertically coupled to the lower surface of the first substrate 11. An S-band radiation patch 130 formed in a cross shape is formed on the upper surface of the second substrate 12.

The S-band radiation patch 130 is formed in a cross shape overlapping the S-band stack patch 110 formed on the first substrate 11.

1 and 4, the third substrate 13 is vertically coupled to the lower surface of the second substrate 12. An S-band feed line 150 and a plurality of X-band radiation patches 331, 332, 333 and 334 are formed on the upper surface of the third substrate 13. The S-band feed line 150 and the X-band radiation patches 331, 332, 333, and 334 do not overlap each other.

The S-band feed line 150 may be formed in a multi-stage line shape partially overlapping with the S-band stack patch 110 and the S-band radiation patch 130.

The X-band radiation patches 331, 332, 333, and 334 are formed in a matrix shape overlapping the X-band stack patches 311, 312, 313, and 314 formed on the first substrate 11, respectively. .

The X-band radiation patches 331, 332, 333, and 334 are formed in a 2×2 arrangement with the S-band feed line 150 interposed therebetween, and may be formed in, for example, a rectangular shape.

1, 5, and 6, the fourth substrate 14 is vertically coupled to the lower surface of the fourth substrate 14. A ground plane including openings 351, 352, 353, and 354 for an X-band antenna is located on the upper surface of the fourth substrate 14, and a power supply network 370 for an X-band antenna is located on the lower surface.

The openings 351, 352, 353, 354 overlap in common with the X-band stack patches 331, 332, 333, 334 and the X-band radiation patches 331, 332, 333, 334 It is formed in a 2x2 arrangement.

The openings 351, 352, 353, 354 are formed to have a size smaller than that of the X-band stack patches 331, 332, 333, 334 and the X-band radiation patches 331, 332, 333, 334 And, for example, may be formed in an H shape.

Hereinafter, each structure of the S-band antenna 100 and the X-band antenna 300 will be described in more detail.

7 is a plan view of the S-band antenna of FIG. 1. 8 is a perspective view of the S-band antenna of FIG. 1.

7 and 8, the S-band antenna 100 uses the cross stack patch 110, the cross radiation patch 130, and the feed line 150 serving as an impedance matcher. It has broadband characteristics.

,

,

을 가진다. 예를 들어, 1단, 2단, 3단의 길이와 폭은 서로 다를 수 있으며, 상기 폭(

,

,

)은 단계적으로 증가하는 형태일 수 있다.The impedance matcher for bandwidth expansion consists of three stages, and the length (width) of the first, second, and third stages is

,

,

Have. For example, the length and width of the first, second, and third stages may be different, and the width (

,

,

) May be in the form of increasing step by step.

In addition, cross-stack patch resonance is used to extend the bandwidth. To extend the bandwidth, the substrate and the air layer with a dielectric constant of close to 1 are not used, and the bandwidth is extended by using the structural variables of the cross-stacked patch 110 and the impedance matcher.

The S-band antenna 100 is composed of the cross stacked patch 110 and the cross radiation patch 130, and all of the patch forms are cross-shaped. The cross patch has no perforation compared to the perforated patch, so it has a wider design space for the high-frequency band antenna, and the selection of the arrangement spacing of the high-frequency band antenna is free.

Accordingly, it is possible to adjust the spacing between the cross patch and the high frequency band patch through the adjustment of the arrangement spacing, so that the isolation between bands and the radiation characteristics can be improved. The broadband characteristic can be implemented by using the stacked cross-patch resonance and the multi-section feed line 150.

(

)과

(

)로 표현하였다. The length and width of the cross-radiation patch 130 and the cross-stack patch 110 are respectively

(

)and

(

).

In addition, the S-band radiation patch 130 is formed to overlap with respect to the same center as the S-band stack patch 110, and the width of the S-band radiation patch 130 is the S-band stack The same as the patch 110, the length of the S-band radiation patch 130 may be formed longer than the S-band stack patch 110.

Table 1 below shows examples of design parameters of an S-band cross stacked patch antenna designed according to the present invention.

S-band Radial Cross Patch Stack Cross Patch

(mm)

(mm)

(mm)

(mm)

(mm) 27.8 7 27.2 7 Multi-stage feeding line length Multi-stage feeding line width

(mm)

(mm)

(mm)

(mm)

(mm)

(mm) 6.5 21.3 16 1.2 1.3 2.2

9 is a plan view of the X-band unit antenna of FIG. 1. 10 is a perspective view of an X-band unit antenna of FIG. 1.

9 and 10, the X-band antenna 300 has a broadband characteristic by using a stack patch resonance and an opening resonance. The X-band antenna 300 is designed in an empty space of the S-band cross patch, and impedance matching uses a series stub at the end of the feed line.

와

를 갖는 정사각형 구조일 수 있다. In the present invention, a stacked patch antenna having an opening coupled feed using both the stacked patch resonance and the opening resonance is used to obtain broadband characteristics. The X-band radiation patch and stack patch each have a side length

Wow

It may have a square structure.

와

로 표현하였다. 개구부의 양단에 H 모양을 만들기 위해 추가로 돌출된 구조의 길이와 폭은 각각

와

로 표현하였다. The opening etched on the ground plane is designed in an H-shape to reduce the length of the opening, and the length and width of the opening are respectively

Wow

Expressed as. The length and width of the additionally protruding structure to make H shape at both ends of the opening

Wow

Expressed as.

와

로 표현하였다. 본 발명에 따라 설계된 X-대역 단위 패치 안테나의 설계 파라미터의 예들을 아래의 표 2에 나타내었다.The characteristic impedance of the feed line is designed to be 100 Ω in consideration of the feed network, and the length and width of the stub for impedance matching are each

Wow

Expressed as. Table 2 below shows examples of design parameters of an X-band unit patch antenna designed according to the present invention.

S-band Radiation Patch Opening

(mm)

(mm)

(mm)

=

(mm)

(mm) 6.8 6.3 1.2 3 Stack patch Feed line

(mm)

(mm)

(mm)

(mm) 5.9 3.7 2 0.7

11 is an enlarged view of the X-band power supply network of FIG. 6.

Referring to FIG. 11, a power supply network 370 for a 2×2 X-band array antenna includes a power divider 373 and the power divider 373 for distributing power supplied from one port (Port 5) in different directions. ) And a phase shifter 371 for feeding the X-band radiation patches in the opposite direction.

For example, the power divider 373 may use a Wilkinson power divider, and the phase shifter 371 may use a broadband 180° phase shifter. In order to suppress the cross polarization of the 2×2 X-band array antenna, the antenna connected to Port 1 and Port 3 and the antenna connected to Port 2 and Port 4 are fed in opposite directions, and two elements with the same feeding direction are fed to the T-distributor. I can connect.

A broadband 180° phase shifter that provides 180° phase difference between the two ports so that the antennas corresponding to Port 1 and Port 3 fed in opposite directions and the antenna corresponding to Port 2 and Port 4 radiate electromagnetic waves of the same phase in a broadband. In addition, two 50 Ω feed lines connected to a broadband 180° phase shifter can be connected to a Wilkinson power divider to reduce the effects of reflected waves.

Although the above has been described with reference to embodiments, it is understood that those skilled in the art can variously modify and change the present invention without departing from the spirit and scope of the present invention described in the following claims. You can understand.

The present invention is a multi-function radar used in military radar as a dual-band antenna having a simple structure and a small number of substrates to be used compared to the prior art developed for a high-performance antenna, and has broadband characteristics and excellent radiation characteristics, As a dual-band antenna used for a composite aperture radar, it will also be used as a civilian antenna such as a next-generation mobile communication dual-band antenna and a 5G mobile communication base station antenna.

10: antenna
100: S-band antenna
300: X-band antenna
110: S-Band Cross Stack Patch
130: S-band cross-radiation patch
150: S-band feed line
311, 312, 313, 314: X-Band Stack Patch
331, 332, 333, 334: X-band radiation patch
351, 352, 353, 354: opening
370: X-band feed network
371: phase shifter
373: power divider
11: first substrate
12: second substrate
13: third substrate
14: fourth substrate

Claims (15)

An S-band stack patch formed in a cross shape on an upper surface of the first substrate; An S-band radiation patch formed in a cross shape overlapping the S-band stack patch on an upper surface of a second substrate coupled to a lower surface of the first substrate; And an S-band feed line partially overlapping the S-band stack patch and the S-band radiation patch on an upper surface of a third substrate coupled to a lower surface of the second substrate.
A plurality of X-band stack patches arranged in a matrix shape on an upper surface of the first substrate; A plurality of X-band radiation patches arranged in a matrix shape overlapping the X-band stack patches on an upper surface of the third substrate; And an X-band power supply network formed on a lower surface of the fourth substrate coupled to the lower surface of the third substrate. And
A common opening double broadband micro using a cross patch, which is attached to the upper surface of the fourth substrate and includes a ground plane having a plurality of openings overlapping the X-band stack patches and the X-band radiation patches in common Strip patch antenna.
The method of claim 1, wherein the S-band radiation patch,
It is formed to overlap the S-band stack patch and the same center as the reference, the width of the S-band radiation patch is the same as the S-band stack patch, and the length of the S-band radiation patch is the S-band stack A dual broadband microstrip patch antenna with a common opening using a cross patch that is formed longer than the patch.
The method of claim 1, wherein the X-band stack patches,
A dual broadband microstrip patch antenna with a common opening using a cross patch, which is formed in a 2×2 array between the cross wings of the S-band stack patch.
◈ Claim 4 was abandoned upon payment of the set registration fee. The method of claim 3, wherein the X-band radiating patches,
A double broadband microstrip patch with a common opening using a cross patch, each formed in a 2×2 arrangement overlapping the X-band stack patches, and each X-band radiation patch is formed larger than each corresponding X-band stack patch antenna.
The method of claim 1, wherein the plurality of openings,
A dual broadband microstrip patch antenna with a common opening using a cross patch, which is formed in a 2x2 array that overlaps the X-band stack patches and the X-band radiation patches in common.
The method of claim 1, wherein the plurality of openings,
A double broadband microstrip patch antenna with a common opening using a cross patch, formed in an H shape.
The method of claim 1, wherein the S-band feed line,
A dual broadband microstrip patch antenna with a common opening using a cross patch, formed in a multi-stage line shape of different lengths and widths.
The method of claim 1, wherein the X-band power supply network,
A power divider for distributing power supplied from one port in another direction; And
A common opening dual broadband microstrip patch antenna using a cross patch, comprising a phase shifter connected from the power divider to feed the X-band radiation patches in an opposite direction.
A first substrate on which an S-band stack patch formed in a cross shape and a plurality of X-band stack patches arranged in a matrix shape are formed on an upper surface;
A second substrate coupled to a lower surface of the first substrate and having an S-band radiation patch formed on an upper surface thereof in a cross shape overlapping the S-band stack patch;
A plurality of matrix shapes that are coupled to the lower surface of the second substrate and overlap the S-band feed line and the X-band stack patches partially overlapping the S-band stack patch and the S-band radiation patch on the upper surface. A third substrate on which X-band radiation patches are formed; And
A fourth ground plane coupled to a lower surface of the third substrate and having a plurality of openings overlapping in common with the X-band stack patches and the X-band radiation patches on an upper surface and an X-band power supply network formed at the lower surface Board;
Containing, a common opening dual broadband microstrip patch antenna using a cross patch.
The method of claim 9, wherein the S-band radiating patch,
It is formed to overlap the S-band stack patch and the same center as the reference, the width of the S-band radiation patch is the same as the S-band stack patch, and the length of the S-band radiation patch is the S-band stack A dual broadband microstrip patch antenna with a common opening using a cross patch that is formed longer than the patch.
The method of claim 9,
The X-band stack patches,
It is formed in a 2×2 arrangement between the cross wings of the S-band stack patch,
The X-band radiation patches,
A double broadband microstrip patch with a common opening using a cross patch, each formed in a 2×2 arrangement overlapping the X-band stack patches, and each X-band radiation patch is formed larger than each corresponding X-band stack patch antenna.
The method of claim 9, wherein the plurality of openings,
A dual broadband microstrip patch antenna with a common opening using a cross patch, which is formed in a 2x2 array that overlaps the X-band stack patches and the X-band radiation patches in common.
The method of claim 9, wherein the plurality of openings,
A double broadband microstrip patch antenna with a common opening using a cross patch, formed in an H shape.
The method of claim 9, wherein the S-band feed line,
A dual broadband microstrip patch antenna with a common opening using a cross patch, which is formed in a multi-stage line shape with different lengths and widths.
The method of claim 9, wherein the X-band power supply network,
A power divider for distributing power supplied from one port in another direction; And a phase shifter connected from the power divider to feed the X-band radiation patches in an opposite direction. A dual broadband microstrip patch antenna with a common opening using a cross patch.

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