KR200247173Y1 - A broad-band dual-polarized microstrip array antenna - Google Patents

Abstract

The present invention relates to a microstrip array antenna, and more particularly, to a wideband dual polarization microstrip array antenna having a parallel feed structure in which two feed layers generating each polarization are separated.

The broadband dual polarization microstrip array antenna according to the present invention minimizes the interference effect of each other by placing transmission paths for each linear polarization on different layers, and by excitation and proximity coupling method by each transmission line. Two polarized waves can be obtained separately from the excitation by the aperture coupled method. By arranging the transmission paths for generating each polarization on a different layer, the parallel path method can be configured to eliminate the bandwidth reduction of the array antenna caused by the conventional serial and parallel mixing methods.

Description

A broad-band dual-polarized microstrip array antenna

The present invention relates to a microstrip array antenna, and more particularly, to a wideband dual polarization microstrip array antenna having a parallel feed structure in which two feed layers generating each polarization are separated.

The conventional microstrip array antenna is a feeder plate on which a feed line is formed, and the thickness of the system is increased by using a dielectric substrate, and the manufacturing cost increases. In addition, there is a disadvantage in that only one polarized wave can be received because it has one excitation section for one patch antenna. In addition, in case of using a single feeder plate, even if the patch antenna has two excitation parts, it is not possible to provide enough space to arrange the excitation transmission line for other polarization. In this case, when the serial feed method and the parallel feed method are mixed, there are disadvantages of having a complicated transmission line structure and a decisive disadvantage of reducing the bandwidth of the array antenna.

1 shows a configuration of a conventional microstrip array antenna. In the drawing, part (1) represents a power input unit, and power is divided into two transmission lines in the upper and lower sides of the drawing after input, and is further divided into two powers left and right again in the power distribution unit 2. Reference numeral 3 is an excitation section for transmitting input power to the patch antenna 4. As described above, in the conventional microstrip array antenna as described above, since it has one excitation part 3, only one polarization reception is possible.

The present invention is to solve the problems of the prior art as described above, by using a plurality of films instead of a dielectric substrate to achieve a reduction in manufacturing cost, at the same time separate the feed layer for generating each polarization into two parallel feed method An object of the present invention is to provide a wideband dual polarized microstrip array antenna having a transmission line structure.

Other objects and advantages of the present invention will become more apparent upon reading the following detailed description of the invention and with reference to the accompanying drawings.

1 is a block diagram of a conventional microstrip array antenna.

Figure 2 is a preferred embodiment of a wideband dual polarized microstrip array antenna according to the present invention.

3 is a layout view of a transmission line for close coupling excitation of the array antenna shown in FIG.

4 is a layout view of an aperture coupled excitation transmission line of the array antenna of FIG. 2.

FIG. 5 shows a layer of slot portions formed in the third film of the array antenna according to FIG. 2.

FIG. 6 shows the transmission line layer of the opening coupling method of the fourth film of the array antenna shown in FIG.

FIG. 7 is a view of overlapping four films of the array antenna shown in FIG. 2. FIG.

8 is a partially enlarged view of FIG. 7.

<Brief description of the main parts of the drawings>

100: array antenna 110,130,150,170: film

112: closed space 114,116: patch antenna

120,140,160,180: Styrofoam

Hereinafter, a wideband dual polarization microstrip array antenna 100 according to the present invention will be described with reference to FIG. 2, which is an embodiment of the present invention.

In the broadband dual polarization microstrip array antenna 100 according to the present invention, a first film 110 coated with a metal material is installed on the entire upper surface except for the inside of the closed space 112 that is arranged in a predetermined array shape. In the middle of the first film (also referred to as ground), a portion of the metal is removed to form a closed space 112, and a patch antenna 114 is formed in the middle of the closed space 112. The patch antenna 116 is also formed outside the closed space 112 of the first film 110.

In the present invention, the film means a metal material coated on a thin vinyl film. This material is about 20% cheaper than a dielectric substrate.

3 illustrates a patch antenna layer in which a plurality of patch antennas having the same structure as the first film of FIG. 1 are formed. That is, the quadrangles on the outside of the small squares of FIG. 3 represent the patch antenna 116 formed on the first film of FIG. 1, and the small squares inside the patch antennas 114 installed in the center of the closed space 112 of FIG. 1. ).

A transmission line (not shown in FIG. 1) passes under the first film 110, and the first film 110 serves to reduce radiation loss in the transmission line. The closed space 112 is a space in which radiation is caused by the resonance of the patch antenna 114.

The first styrofoam 120 is positioned under the first film, and the second film 130 is installed under the first styrofoam. In the second film, a transmission line layer of a close coupling type as shown in FIG. 4 is formed, and the transmission line layer can be excited without being directly connected to the patch antenna. In addition, the transmission line layer of the second film uses a parallel connection method while avoiding the closed space 112 of the first film, thereby preventing a decrease in bandwidth generated when the array is formed. That is, the transmission line layer of the second film is connected to each other in parallel to the lower end of the first film except the closed space 112 to excite each of the patch antennas according to the current supply applied from the outside to generate the first polarization. At this time, the thickness of the styrofoam is preferably 1mm.

The second styrofoam 140 is installed below the second film 130, and the third film 150 is formed at the bottom of the second styrofoam 140. Slots 152 are formed in the third film 150 to allow electromagnetic waves to penetrate at positions corresponding to the patch antennas. 5 shows a layer of slot portions 152 formed in the third film 150.

At this time, the surface of the third film 150 is coated with a metal material like the first film and there is no slot.

The slot 152 is for opening coupling excitation, and serves as a ground of a transmission line installed in the upper layer 130 and the lower layer 170 of the ground 150 to maintain isolation between each other.

The third styrofoam 160 is installed at the lower end of the third film 150, and the fourth film 170 is installed at the lower end of the third styrofoam 160. The fourth film 170 has an opening coupling excitation transmission line connected to each other in parallel to excite each of the patch antennas through the slot 152 according to a current supply applied from the outside to generate a second polarization. Is formed. A fourth styrofoam 180 is installed at a lower end of the fourth film 170, and a thin metal plate 190 is installed at a lower end of the fourth styrofoam 180. That is, the fourth film 170 has a transmission line for opening coupling excitation of the patch antenna of the first film 110, is excited to each patch antenna through the slot 152 of the upper ground 150, and the fourth film ( 170 is blocked by the lower mold 190 and the upper ground 150 to reduce the radiation loss by the transmission line. In the present invention, the bandwidth of the array antenna is improved by using the parallel connection method as shown in FIG. 4. 6 illustrates a transmission line layer of an opening coupling method of the fourth film 170. The two-band close coupling excitation transmission line and the opening coupling excitation transmission line are disposed perpendicular to each other.

FIG. 7 illustrates a case where four films of the array antenna of FIG. 2 are overlapped, and FIG. 8 illustrates an enlarged part of FIG. 7.

As described above, the present invention minimizes the interference effect of each other by placing transmission paths for each linear polarization on different layers, and excitation and opening coupling methods by proximity feeding method by each transmission line ( Two polarizations can be obtained separately from excitation by Aperture coupled method. Such transmission paths for generating each polarized wave are arranged in different layers, and thus, by using only the parallel feed method, bandwidth reduction of the array antenna caused by the conventional serial and parallel mixing methods can be eliminated.

On the other hand, the present invention adopts a strip-type transmission line structure instead of a microstrip-type transmission line in order to prevent the transmission loss that may occur by using a plurality of films instead of a dielectric substrate to reduce the manufacturing cost.

In the present invention, since the opening coupling excitation transmission line is surrounded by the lowermost metal plate 190 and the third film 150, the radiation loss on the transmission line is prevented, and the transmission line is formed in parallel to increase the bandwidth of the array antenna. Let's do it.

The present invention may be variously modified and may take various forms and the detailed description of the present invention has been described only with respect to specific embodiments thereof. It is to be understood, however, that the present invention is not limited to the particular form referred to in the detailed description of the invention, but rather includes all modifications, equivalents, and substitutes within the spirit and scope of the invention as defined by the appended claims. It should be understood to do.

In the present invention, the manufacturing cost is reduced by replacing a plurality of films instead of a conventional dielectric substrate, and at the same time, a transmission path for each linear polarization is placed on a different layer to minimize interference effects between each other. Two polarizations can be obtained separately from the excitation by the proximity feeding method and the excitation by the aperture coupled method.

In addition, by arranging transmission paths for each polarization generation on a different layer, the parallel path method can be configured to eliminate bandwidth reduction of the array antenna caused by the conventional serial and parallel mixing methods.

In addition, the present invention adopts a method of using a strip line instead of a microstrip line for each feed layer, thereby reducing energy loss generated at the feed portion.

In addition, the present invention has the advantage of operating the antenna by electromagnetic coupling without directly coupling each of the feeder and the patch antenna element.

Claims (8)

Claim 1 has been deleted. Claim 2 has been deleted. Claim 3 has been deleted. A first film in which a plurality of patch elements are arranged in a constant array shape and a metal material is coated on the entire upper surface thereof; A closed space formed in the center of the first film; A patch antenna formed in the center of the closed space and emitting radiation by resonance in the closed space; A first styrofoam positioned at the bottom of the first film; Located at the bottom of the first styrofoam, but connected to each other in parallel to the bottom of the first film excluding the closed space to excite each of the patch antennas according to the current supply from the outside to generate a first polarization A second film having a transmission line for close coupling excitation; A second styrofoam positioned at the bottom of the second film; A third film positioned at a lower end of the second styrofoam and penetrating at a position corresponding to each patch antenna to form a slot; A third styrofoam positioned at the bottom of the third film part; Located at the lower end of the third styrofoam, and connected in parallel to each other formed in accordance with the current supplied from the outside to excite each of the patch antenna through the slot to form an opening coupling excitation transmission line for generating a second polarization Fourth film; A fourth styrofoam positioned at the bottom of the fourth film; And And a thin metal plate positioned at the bottom of the fourth styrofoam. 5. The wideband dual polarization microstrip array antenna of claim 4, wherein each feed layer uses a strip line to reduce energy losses occurring at the feed portion. 6. The wideband dual polarization microstrip array antenna of claim 5 wherein each of the feeders and patch elements are electromagnetically coupled to operate as antennas. 7. The method of claim 6, wherein one of the two polarizations is the polarization of the patch element by the parallel feed portion using the proximity feeding (proximity feeding) method, the other polarization is the electromagnetic wave generated from the parallel feed portion is opening And a patch device radiates through the slot unit using an aperture coupled method. 8. The wideband dual polarization microstrip array antenna of claim 7, wherein the second film and the fourth film are disposed at right angles to each other on a horizontal plane formed by the first to fourth styrofoams.