KR100721871B1 - Waveguide slot array antenna for receiving random polarized satellite signal - Google Patents

Abstract

The present invention relates to a waveguide slotted array antenna that enables the reception of satellite signals having any linearly polarized wave by rotating a vertical or horizontal polarized wave generated from a slot of the waveguide slotted array antenna at an arbitrary angle.

According to the present invention, a waveguide slotted array antenna for receiving a linear signal having an arbitrary linear polarization is formed with a groove communicating with a slot and separated by an upper surface around a slot upper portion of an upper conductor plate, and formed on an upper portion of the upper conductor plate. A linear polarization groove having a slot angle and a skew angle to rotate the linearly polarized wave of the satellite signal by a skew angle, and a matching element formed on both sides of the polarization rotation groove in a semicircular shape to perform impedance matching. The rotor is coupled to optimize the antenna impedance bandwidth by matching the input impedance of the antenna through the linearly polarized rotor, and can minimize the manufacturing cost and power loss by reducing the size of the antenna.

Satellite Antenna, Waveguide, Polarization Rotation

Description

Waveguide Slot Array Antenna for Receiving Satellite Signal with Arbitrary Linear Polarization {Waveguide Slot Array Antenna For Receiving Random Polarized Satellite Signal}

1 is an exploded perspective view of a conventional waveguide slot antenna.

2 is a combined perspective view of a waveguide slotted array antenna for receiving a satellite signal having any linearly polarized wave according to the present invention.

3 is an exploded perspective view of a waveguide slot array antenna for receiving a satellite signal having any linearly polarized wave according to the present invention.

4 is a combined cross-sectional view of a waveguide slot array antenna for receiving a satellite signal having any linearly polarized wave according to the present invention.

5A is a plan view of a lower layer conductor plate according to the present invention, FIG. 5B is a rear view of the lower layer conductor plate, and FIG. 5C is a cross-sectional view of the lower layer conductor plate.

FIG. 6A is a plan view of a multilayer conductor plate according to the present invention, FIG. 6B is a rear view of the multilayer conductor plate, and FIG. 6C is a cross-sectional view of the multilayer conductor plate.

7A is a plan view of an upper conductor plate according to the present invention, FIG. 7B is a rear view of the upper conductor plate, and FIG. 7C is a cross-sectional view of the upper conductor plate.

8A is a plan view of a linearly polarized rotator according to the present invention, and FIG. 8B is a sectional view of the linearly polarized rotator.

9 is a state diagram illustrating a process in which a polarization rotating groove and a matching element of a linear polarization rotating machine according to the present invention are coupled to an upper portion of a slot of an upper conductor plate to rotate a polarized wave.

10A to 10D are examples showing the relationship between the skew angle and the width and length of the polarization rotating groove and the matching element according to the present invention.

11A to 11D are examples of various modifications of a polarization rotating groove and a matching element of a linearly polarized light rotary machine according to another embodiment of the present invention.

※ Explanation of codes for main parts of drawing

100: linearly polarized rotary machine 110: polarized rotation groove

120: matching element 121: stem portion

122: semi-circular part 200: upper conductor plate

210: Slot 220: Cavity

230: Groove 240: Upper surface

300: middle conductor plate 310: radiation groove

320: waveguide 321,322,323: distributor

330: radiation tube 400: lower conductor plate

410: feeding route 420: waveguide

421,422,423: distributor 430: radiation tube

440: Bulge

The present invention relates to a waveguide slot array antenna for receiving a satellite signal having an arbitrary linearly polarized wave. More particularly, a circular groove is formed around a slot of the waveguide slot array antenna, and the vertical groove generated from the slot on the top of the circular groove or Waveguide slot arrangement for receiving a satellite signal with arbitrary linear polarization by combining a linear polarization rotator with a matching element for impedance matching with a circular groove and a polarization rotary groove for rotating the horizontal polarization at an arbitrary angle Relates to an antenna.

In general, as a satellite antenna, a microstrip patch array antenna using a dielectric substrate or a waveguide slot array antenna for obtaining highly efficient antenna characteristics is used.

1 is an exploded perspective view of a conventional waveguide slotted array antenna, which is registered in Korean Patent No. 400657, "Waveguide slot antenna having multiple structures."

In the registered patent, a feed passage and a first waveguide 32 are formed, and a multistage protrusion 34 is provided at one side of the radiation waveguide 31 to prevent loss of frequency received by the feed passage and the first waveguide 32. The lower conductive plate 30 is formed, and the second feeding path and the second waveguide communicating with the feed path of the lower conductive plate 30 and the first waveguide 32 are formed, and the radial grooves penetrated from the upper part to the lower part. The middle conductor plate 20 having the 21 formed thereon is stacked on the lower conductor plate 30, and protrusions 11 are formed at predetermined intervals on the upper side thereof, and at one side of the protrusions 11 at predetermined intervals. A plurality of slots 12 are arranged and formed to penetrate from the top to the bottom, and a plurality of cavity-type tubes are formed at predetermined intervals on the lower surface thereof, and are stacked on top of the middle conductor plate 20 to receive a frequency. It consists of a plate (10).

The waveguide slot antenna having a multiple structure having the above structure has a small resistance loss and radiation loss by transmitting satellite frequency signals through the waveguide.

However, the registered patent is an antenna for receiving vertical or horizontal polarization like a conventional satellite antenna, and when the signal transmitted from the satellite is a satellite signal having an arbitrary linear polarization, it is skewed to the satellite signal polarization and the reception polarization of the antenna. Skew occurred, resulting in the loss of the received satellite signal according to the skew angle.

In order to reduce the loss of the satellite signal caused by the skew angle, a method of compensating the satellite antenna itself by rotating the skew angle has been used. However, this method rotates the satellite antenna itself. As a result, the manufacturing cost is high and the power loss is large.

The present invention has been proposed to solve the problems of the prior art, an object of the present invention is to rotate the vertical or horizontal polarization by a skew angle using a linear polarization rotator to receive a satellite signal having any linearly polarized It is to provide a waveguide slotted array antenna for receiving a satellite signal having any linearly polarized wave that can receive a signal without loss.

Waveguide slot array antenna for receiving a satellite signal of any linearly polarized wave according to the present invention for achieving the above object is combined with a lower conductor plate and a middle conductor plate to form a waveguide and a feed path through which satellite frequency signals are transmitted. And a plurality of cavities and slots coupled to an upper portion of the middle conductor plate to communicate with the waveguide, and having an upper conductor plate for transmitting and receiving satellite frequency signals, wherein the slot is arranged around a slot upper portion of the upper conductor plate. A groove is formed in communication with the upper surface and the boundary is divided by the upper surface, and a polarization rotary groove for forming a skew angle in the longitudinal direction of the slot on the upper conductive plate to rotate the linear polarization of the satellite signal by the skew angle, and the polarization Matching elements formed in semicircular shapes on both sides of the rotating groove to perform impedance matching The linear polarization rotary machine provided is combined.

The plane of the groove is formed in a circular shape for rotating a linear polarization of the satellite signal, the matching element is a dumbbell consisting of a semi-circular symmetrically formed on both sides of the stem portion penetrating the center of the polarization rotation groove and the stem portion It is preferable that it is formed in a shape.

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

2 is a combined perspective view of a waveguide slot array antenna for receiving satellite signals with arbitrary linearly polarized waves according to an embodiment of the present invention, and FIG. 3 is an exploded perspective view of a waveguide slot array antenna for receiving satellite signals with arbitrary linearly polarized waves. 4 is a combined cross-sectional view of a waveguide slotted array antenna for receiving a satellite signal having arbitrary linearly polarized waves.

As shown in Figures 2 to 4, the waveguide slot array antenna for receiving a satellite signal having any linearly polarized wave according to the present invention is the lower conductor plate 400, the middle conductor plate 300, the upper conductor plate 200 And a linearly polarized rotary machine 100 is stacked, and the fastening hole 401 for coupling to the lower conductor plate 400, the middle conductor plate 300, and the upper conductor plate 200 through a fastening means such as a screw. 301 and 201 are respectively formed at corresponding positions.

5A is a plan view of a lower conductor plate according to an embodiment of the present invention, FIG. 5B is a rear view of the lower conductor plate, and FIG. 5C is a cross-sectional view of the lower conductor plate. 6A is a plan view of a middle conductor plate according to an embodiment of the present invention, FIG. 6B is a rear view of the middle conductor plate, and FIG. 6C is a cross-sectional view of the middle conductor plate.

As shown in FIGS. 2 to 6C, the lower conductor plate 400 and the middle conductor plate 300 include waveguides 420 and 320 for transmitting satellite signals, and dividers 421, 422, and 423 for distributing signals. 321, 322, 323 are formed.

Meanwhile, the lower conductive plate 400 is formed with a radiation tube 430 and a bulge 440 for changing the direction of the received satellite signal and transmitting the received satellite signal to the waveguide 420. A feed path 410 is formed at the end of the 420 to output the satellite signal to the outside. In addition, a radiation tube 330 is formed at the final end of the waveguide 320 distributed through the distributors 321, 322, 323 in the middle conductor plate 300, and the upper portion of the radiation tube 330 Radiating groove 310 is formed in communication with the upper outer side.

7A is a plan view of an upper conductor plate according to an embodiment of the present invention, FIG. 7B is a rear view of the upper conductor plate, and FIG. 7C is a cross-sectional view of the upper conductor plate.

A plurality of slots 210 penetrating the upper and lower portions are formed in the upper conductive plate 200, and grooves of which upper portions are opened at predetermined depths around the slots 210 are formed around the upper portions of the slots 210. A top surface 240 is formed to form a boundary between the groove 230 and the groove 230. In addition, a cavity 220 is formed in the lower portion of the upper conductive plate 200, the lower side of which is open and the upper side thereof communicates with the slot 210. The cavity 220 communicates with four adjacent slots 210. It is divided into sizes to be formed respectively.

The slot 210 serves to receive satellite signals, and the groove 230 and the top surface 240 serve to minimize interference between satellite signals respectively received in the plurality of slots 210. The cavity 220 collects satellite signals received through each slot 210 while extending the impedance bandwidth of the antenna and transmits them to the radiation groove 310 of the middle conductor plate 300.

In the embodiment of the present invention, the shape of the groove 230 is formed as a circular column having a diameter equal to or similar to the length of the slot 210 to rotate the linearly polarized wave at an arbitrary angle. The upper surface 240 forming a boundary between the plurality of grooves 230 serves to prevent satellite signals applied to each slot 210 from leaking out sideways to cause mutual interference.

8A is a plan view of a linearly polarized rotator according to an embodiment of the present invention, and FIG. 8B is a cross-sectional view of the linearly polarized polarizer.

The linearly polarized rotator 100 is formed of a film type, the linearly polarized rotator 100 is formed with a polarization rotating groove 110 for rotating a horizontal or vertical polarization signal emitted from the slot 210 at any angle. The semicircular matching element 120 smaller than the circular groove 230 is formed symmetrically about the polarization rotation groove 110 on both sides of the polarization rotation groove 110.

FIG. 9 is a state diagram illustrating a process of rotating a linearly polarized wave by coupling a polarization rotating groove and a matching element of a linearly polarized light rotating machine according to an embodiment of the present invention to an upper portion of a slot of an upper conductor plate.

As shown in FIG. 9, the polarization rotating groove 110 of the linearly polarized rotary machine 100 is spaced apart from the slot 210 by the depth of the groove 230 formed in the upper conductive plate 200, thereby providing the slot 210. The slot is rotated to form a constant angle with the slot 210 to maintain a constant skew angle. Accordingly, the polarization rotating groove 110 rotates the vertical and horizontal polarization radiated from the slot 210 by the skew angle formed by the slot 210 and the polarization rotating groove 110.

In the embodiment of the present invention, the depth of the groove 230 forming the separation distance between the slot 210 and the polarization rotating groove 110 is about 0.25 times the length of the satellite signal frequency wavelength, which is a slot having different impedances. In order to prevent the satellite signal from being lost due to reflection or the like when the satellite signal is transmitted between the 210 and the polarization rotating grooves 110, the satellite signal can be smoothly transmitted.

In order to improve the impedance bandwidth of the antenna, the polarization rotating groove 110 should be appropriately changed in size such as width and length according to skew angle. On the other hand, in the embodiment of the present invention, the matching element 120 is a stem portion 121 penetrating the center of the longitudinal direction of the polarization rotation groove 110 and a semi-circular portion (symmetrically formed on both sides of the stem portion 121) It is made of a dumbbell shape having a 122, this matching element 120 serves to improve the impedance bandwidth of the antenna by matching the input impedance of the antenna. Like the polarization rotation groove 110, the matching element 120 may be designed to have an optimal impedance bandwidth by adjusting its size.

10A to 10D illustrate an example of a relationship between a skew angle and a width and a length of a polarization rotating groove and a matching element according to an embodiment of the present invention. FIG. 10A illustrates a polarization when the skew angle of the slot and the polarization rotating groove is 45 degrees. 10B is an example of a polarization groove and a matching element when the skew angle of the slot and the polarization rotation groove is 50 degrees, and FIG. 10C and FIG. 10D are a skew angle of the slot and the polarization rotation groove. In the case of a figure, it is an example of a polarization rotation groove and a matching element.

As shown in FIGS. 10A to 10C, when the skew angle formed by the slot 210 and the polarization rotating groove 110 is greater than 45 degrees, the size of the polarization rotating groove 110 is reduced and the matching element 120 is reduced. The diameter of the semi-circle portion 122 is reduced but the width of the stem portion 121 is shown to be wider.

On the contrary, when the skew angle formed by the slot 210 and the polarization rotating groove 110 is smaller than 45 degrees, the size of the polarization rotating groove 110 is increased and the diameter of the semicircle 122 of the matching element 120 is increased. Although larger, the width of the stem 121 is tended to be narrowed. Meanwhile, when the skew angle formed by the slot 210 and the polarization rotating groove 110 is 15 degrees, a rectangular groove may be formed at a 15 degree angle in a circle of the matching element 120 as shown in 10d.

The size of the polarized rotation groove 110, the size of the entire semicircular portion 122 of the matching element 120, the width of the stem 121 causes a capacitance or inductance component to match the impedance of the antenna.

Meanwhile, in the exemplary embodiment of the present invention, the linearly polarized rotary machine 100 including the polarized rotary groove 110 and the matching element 120 may be variously modified to perform the same to similar functions.

11A to 11D are examples of various modifications of a polarization rotating groove and a matching element of a linearly polarized light rotary machine according to another embodiment of the present invention.

As shown in FIG. 11A, the matching element 120 may be formed with the stem 121 of the matching element 120 omitted and only the semicircle 122 remaining, and as shown in FIG. 11B. The stem portion 121 of the 120 may be shorted in the middle, and the stem portion 121 of the matching element 120 may be formed in a streamline shape as illustrated in FIG. 11C.

As such, the polarization rotating groove 110 and the matching element 120 of the linearly polarized light rotating machine 100 according to the present invention may be modified in various forms to improve antenna impedance bandwidth by matching antenna impedance.

As described above, the waveguide slotted array antenna for receiving a satellite signal having any linearly polarized wave according to the present invention is radiated from the slot through a linearly polarized rotator provided with a polarizing groove and a matching element for forming a constant skew angle with the slot. The antenna impedance bandwidth can be optimized by matching the input impedance of the antenna by rotating horizontal or vertical polarization.

In addition, the waveguide slot array antenna for receiving a satellite signal having an arbitrary linearly polarized wave according to the present invention uses a linearly polarized rotator to rotate the linearly polarized wave by the skew angle without rotating the antenna by the skew angle to remove skew generated from the antenna. It can rotate to reduce the size of the antenna, there is an effect that can minimize the manufacturing cost and power loss.

Claims (3)

The lower conductor plate and the middle conductor plate are combined to form waveguides and feed paths through which satellite frequency signals are transmitted, and a plurality of cavities and slots coupled to the upper portion of the intermediate conductor plate to communicate with the waveguide form satellite signals. A waveguide slotted array antenna having an upper conductor plate for transmitting and receiving, A groove 230 is formed around the upper portion of the upper slot plate 210 of the upper conductive plate 200 to communicate with the slot 210 and the boundary is separated by the upper surface 240. On the upper portion of the upper conductive plate 200, a polarization rotation groove 110 for forming a skew angle and a skew angle of the slot 210 to rotate linear polarization of the satellite signal by the skew angle, and the polarization rotation groove 110 A waveguide slotted array antenna for receiving a satellite signal having any linearly polarized wave, characterized in that a linearly polarized rotator (100) having a matching element (120) formed in a semicircle shape and performing impedance matching on both sides thereof is coupled. The method according to claim 1, The plane of the groove 230 is a waveguide slot array antenna for receiving a satellite signal of any linear polarization, characterized in that formed in a circular shape for rotating the linear polarization of the satellite signal. The method according to claim 1, The matching element 120 is a dumbbell shape consisting of a stem portion 121 penetrating the center of the polarization rotation groove 110, and a semi-circular portion 122 formed symmetrically in a semicircular shape on both sides of the stem portion 210. A waveguide slot array antenna for receiving a satellite signal having an arbitrary linear polarization, characterized in that consisting of.

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