KR101589721B1 - Dual-polarized monopulse antenna for millimeter-wave band seeker - Google Patents

Dual-polarized monopulse antenna for millimeter-wave band seeker Download PDF

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Publication number
KR101589721B1
KR101589721B1 KR1020150090960A KR20150090960A KR101589721B1 KR 101589721 B1 KR101589721 B1 KR 101589721B1 KR 1020150090960 A KR1020150090960 A KR 1020150090960A KR 20150090960 A KR20150090960 A KR 20150090960A KR 101589721 B1 KR101589721 B1 KR 101589721B1
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South Korea
Prior art keywords
reflector
sum
sub
antenna
polarized
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KR1020150090960A
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Korean (ko)
Inventor
박창현
정채현
이국주
백종균
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엘아이지넥스원 주식회사
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
    • H01Q15/14—Reflecting surfaces; Equivalent structures
    • H01Q15/148—Reflecting surfaces; Equivalent structures with means for varying the reflecting properties
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/42—Housings not intimately mechanically associated with radiating elements, e.g. radome
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q3/00—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
    • H01Q3/26—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the relative phase or relative amplitude of energisation between two or more active radiating elements; varying the distribution of energy across a radiating aperture

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Aerials With Secondary Devices (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)

Abstract

Disclosed is a dual polarized monopulse antenna for millimeter-wave searcher. The dual polarized monopulse antenna according to the present invention can be miniaturized by improving the space utilization by fixing the auxiliary reflector and the feeder and rotating only the main reflector, and it is possible to downsize the searcher, And horizontal polarization, it is possible to realize a double polarization mono-pulse type Cassegrain antenna. Therefore, the present invention not only enables the optimization design of the Cassegrain antenna inside the millimeter-wave searcher, but also the target identification ability can be improved.

Description

DUAL-POLARIZED MONOPULSE ANTENNA FOR MILLIMETER-WAVE BAND SEEKER BACKGROUND OF THE INVENTION [0001]

The present invention relates to a dual polarization monopulse antenna, and more particularly to a dual polarization monopulse antenna for a millimeter wave searcher having a dipole polarization monopulse type feed structure by fixing a sub reflector to a radome to operate in a millimeter wave band.

A waveguide slot array antenna and a reflector antenna are mainly used as guided weapon search antennas that track a target accurately using a monopulse method. In the microwave band, a waveguide slot array antenna is mainly used, but in a millimeter wave band, a reflector antenna of a simple structure is used in consideration of manufacturing precision. Also, the reflector antenna uses a Cassegrain antenna with little influence of electromagnetic interference.

Typical Cassegrain antennas are composed of a main reflector, a sub reflector, and a feed horn. In a typical Cassegrain antenna, the main reflector, the sub reflector, and the feed horn both rotate with the same rotation axis.

A typical Cassegrain antenna will be described with reference to Fig.

FIG. 1 is a view showing an example of a Cassegrain antenna structure implemented in a general radar system, in which (a) shows the basic structure of a general Cassegrain antenna, and (b) shows the movement of the sub reflector and the main reflector.

1A and 1B, a conventional Cassegrain antenna includes a main reflector 10, a sub reflector 20, a feeder 30, and a support structure 40 of the sub reflector 20 .

In the conventional Cassegrain antenna, the main reflector 10, the sub reflector 20, and the feeder 30 are integrally formed and rotate with the same rotation axis. And the auxiliary reflector 20 is supported by the support structure 40 so as to face the power feeder 30. [

In this case, the auxiliary reflector, the main reflector, and the feed horn are all formed integrally so that the support of the sub-reflector causes electromagnetic interference, and the auxiliary reflector rotates integrally with the main reflector, .

SUMMARY OF THE INVENTION It is an object of the present invention to provide a dual polarization monopulse antenna capable of miniaturizing a millimeter wave searcher.

It is another object of the present invention to provide a dual polarization monopulse antenna for a millimeter wave searcher capable of implementing a dual polarization monopulse feed structure.

According to an aspect of the present invention, there is provided a dual polarized monopulse antenna including: a power feeder for radiating radio waves; A sub reflector arranged to face the radiation surface of the feeding part and selecting and reflecting polarized waves of the emitted radio waves; A radome for fixing the sub-reflecting plate so as to face the emitting surface of the feeding part; A main reflector disposed to face the sub-reflector and reflecting again the polarized wave reflected from the sub-reflector; And driving means for driving the main reflector up and down and left and right in a state where the power feeder and the sub reflector are fixed.

Wherein the auxiliary reflector selectively passes one of a vertical polarization and a horizontal polarization, and the other reflects the light to the main reflector.

The power feeder includes at least four power feeders, and is disposed at the center of the main reflector.

Wherein the power feeder generates a transmission signal and radiates the power through the four power feeders; Four orthogonal mode converters for separating signals received from the four feeders into a vertical polarization signal and a horizontal polarization signal; A first comparator for receiving the horizontal polarization signal among the signals having passed through the four orthogonal mode converters and generating three sum and difference signals SUM_H, AZ_H and EL_H; A second comparator receiving the vertically polarized signal among the signals having passed through the four orthogonal mode converters to generate three sum and difference signals SUM_V, AZ_V and EL_V; And a receiver for receiving the generated sum and difference signals SUM_H, AZ_H, EL_H, SUM_V, AZ_V, and EL_V.

Therefore, the dual polarized monopulse antenna of the present invention can be miniaturized by improving the space utilization by fixing the auxiliary reflector and the feeding part and rotating only the main reflector, and it is possible to miniaturize the searcher, The antenna can be separated into the polarized wave and the horizontal polarized wave, thereby realizing a double polarized monopulse type Cassegrain antenna.

Therefore, the present invention can not only optimize the design of the Cassegrain antenna inside the millimeter-wave searcher but also improve the target identification ability.

1 shows an example of a general Cassegrain antenna structure.
2 schematically shows a dual polarization monopulse antenna configuration according to an embodiment of the present invention.
3 schematically illustrates a dual polarization monopulse type feed structure of a dual polarization monopulse antenna according to an embodiment of the present invention.

In order to fully understand the present invention, operational advantages of the present invention, and objects achieved by the practice of the present invention, reference should be made to the accompanying drawings and the accompanying drawings which illustrate preferred embodiments of the present invention.

Hereinafter, the present invention will be described in detail with reference to the preferred embodiments of the present invention with reference to the accompanying drawings. However, the present invention can be implemented in various different forms, and is not limited to the embodiments described. In order to clearly describe the present invention, parts that are not related to the description are omitted, and the same reference numerals in the drawings denote the same members.

Throughout the specification, when an element is referred to as "including" an element, it does not exclude other elements unless specifically stated to the contrary. The terms "part", "unit", "module", "block", and the like described in the specification mean units for processing at least one function or operation, And a combination of software.

The dual polarization monopulse antenna according to an embodiment of the present invention is implemented for a millimeter wave searcher and can be implemented as a Cassegrain antenna.

FIG. 2 is a schematic view of a dual polarization monopulse antenna according to an embodiment of the present invention. FIG. 2 (a) shows a basic structure of a dual polarization monopulse antenna according to the present invention, A main reflecting plate, and a feeding part, respectively.

Referring to FIG. 2A, a dual polarized monopulse antenna 100 according to the present invention includes a main reflector 110, a sub reflector 120, a feeder 130, and a sub- And a radome 140 as shown in FIG.

The dual polarization monopulse antenna 100 according to the present invention may include the driving unit 150 such that the auxiliary reflector 120 and the feeder 130 are fixed and only the main reflector 110 rotates.

Specifically, the main reflector 110 has a parabolic shape, and an opening of the power feeder 130 protrudes from the center, and the main reflector 110 can be rotated by the driving unit 150. The main reflector 110 can convert the vertical (or horizontal) polarized wave reflected by the sub-reflecting plate 120 into a horizontal (or vertical) polarized wave and reflect it.

The auxiliary reflector 120 is fixed to the radome 140 so as to face the feeder 130 and can be implemented to selectively reflect only horizontal (or vertical) polarized waves and to transmit only vertical (or horizontal) polarized waves. The sub-reflecting plate 120 may be a curved surface.

The feeder 130 is located at the center of the main reflector 110 and emits horizontal (or vertical) polarized waves to the side of the sub-reflector 120 during transmission and is reflected by the sub- ) Polarization can be received.

The radome 140 may be a dome-shaped cover provided on the front surface of the main reflector 110, and may fix the sub-reflector 120 to face the feeder 130. Since the auxiliary reflector 120 is fixed to the radome 140, a separate support structure for supporting the auxiliary reflector 120 is unnecessary and electromagnetic interference caused by the support structure can be prevented.

The driving means 150 is a means for rotating the main reflector 110. In the present invention, only the main reflector 110 can be rotated.

Referring to FIG. 2B, the dual polarization monopulse antenna 100 according to the present invention includes a sub reflector 120 and a feeder 130 fixed to each other, and only the main reflector 110 is driven by the driving means 150 It can rotate.

That is, in the present embodiment, the antenna can be configured to rotate the main reflector and the auxiliary reflector 120 and the feeder 130 so that the miniaturization of the searcher can be achieved.

As described above, in the dual polarized monopulse antenna of the present invention, the auxiliary reflector is fixed to the radome so as to face the feeder without a separate support structure, and only the main reflector is rotated so that the antenna can be optimally designed. can do.

Meanwhile, in the dual polarized monopulse antenna according to an embodiment of the present invention, the feeder 130 may have a feeder structure for monopulse implementation and a feeder structure for dual polarization implementation.

Hereinafter, the dual polarization monopulse feeding system according to the present invention will be described in detail with reference to FIG.

3 schematically shows a feed structure of a dual polarization monopulse type feeder in a dual polarization monopulse antenna according to an embodiment of the present invention.

3, the feeding unit 130 of the dual polarized monopulse antenna 100 according to the present invention includes four feeding units 131, 132, 133 and 134, an orthogonal mode converter (OMT) A first comparator 220 and a second comparator 220, a transmitter 230, and a receiver 240. The first and second comparators 220 and 221,

Specifically, the four feeders 131, 132, 133, and 134 can generate a monopulse sum and difference signal in azimuth AZ and elevation angle (EL) directions. The four feeders 131, 132, 133, and 134 may receive vertical (or horizontal) polarized waves reflected from the sub reflector 120. That is, a signal input to the four power feeders 131, 132, 133, and 134 may be a signal in which a plurality of polarized waves are simultaneously received from the target.

The orthogonal mode transducers 210, 211, 212, and 213 may separate the signals received from the four feeders 131, 132, 133, and 134 into vertical and horizontal polarized signals.

The first comparator 220 converts the horizontal polarized signal among the signals having passed through the orthogonal mode transducers 210, 211, 212 and 213 into three sum and difference signals SUM_H, AZ_H and EL_H and transmits them to the receiver 240 have.

The second comparator 221 converts the vertically polarized signal among the signals having passed through the orthogonal mode transducers 210, 211, 212 and 213 into three sum and difference signals SUM_V, AZ_V and EL_V and transmits them to the receiver 240 have.

Namely, each of the polarized signals having passed through the orthogonal mode transducers (OMTs 210, 211, 212, 213) is divided into six sum, difference signals SUM_H, AZ_H, EL_H, SUM_V, AZ_V, and EL_V), and transmits the result to the receiver 240.

The transmission unit 230 may generate a transmission signal and radiate it through the four power feeders 131, 132, 133, and 134.

The receiver 240 may receive the sum, difference signals SUM_H, AZ_H, EL_H, SUM_V, AZ_V, and EL_V generated by the first and second comparators 220 and 221.

As described above, the dual polarized monopulse antenna of the present invention realizes the target distance, the azimuth angle and the elevation angle more accurately than the conventional single polarization polarized type Caspian antenna by implementing the dual polarization monopulse type feed structure, Not only the identification ability is improved, but also the ability to cope with electromagnetic jamming can be enhanced.

The method according to the present invention can be implemented as a computer-readable code on a computer-readable recording medium. A computer-readable recording medium includes all kinds of recording apparatuses in which data that can be read by a computer system is stored. Examples of the recording medium include a ROM, a RAM, a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device, and the like, and a carrier wave (for example, transmission via the Internet). The computer-readable recording medium may also be distributed over a networked computer system so that computer readable code can be stored and executed in a distributed manner.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art.

Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

Claims (4)

A feeding part for radiating radio waves;
A sub reflector arranged to face the radiation surface of the feeding part and selecting and reflecting polarized waves of the emitted radio waves;
A radome for fixing the sub-reflecting plate so as to face the emitting surface of the feeding part;
A main reflector disposed to face the sub-reflector and reflecting again the polarized wave reflected from the sub-reflector; And
And driving means for driving the main reflector in the up / down / right / left directions while the power feeder and the sub reflector are fixed,
Wherein the power feeder includes at least four power feeders,
Wherein the power feeder generates a transmission signal and radiates the power through the four power feeders;
Four orthogonal mode converters for separating signals received from the four feeders into a vertical polarization signal and a horizontal polarization signal;
A first comparator for receiving the horizontal polarization signal among the signals having passed through the four orthogonal mode converters and generating three sum and difference signals SUM_H, AZ_H and EL_H;
A second comparator receiving the vertically polarized signal among the signals having passed through the four orthogonal mode converters to generate three sum and difference signals SUM_V, AZ_V and EL_V; And
And a receiver for receiving the generated sum and difference signals SUM_H, AZ_H, EL_H, SUM_V, AZ_V, and EL_V. The method according to claim 1,
Wherein the auxiliary reflector selectively passes one of the vertically polarized wave and the horizontally polarized wave and reflects the other one to the main reflector side. delete delete
KR1020150090960A 2015-06-26 2015-06-26 Dual-polarized monopulse antenna for millimeter-wave band seeker KR101589721B1 (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101775688B1 (en) 2016-12-02 2017-09-06 엘아이지넥스원 주식회사 Apparatus for tracking target using multiple sensor and method thereof
CN109462017A (en) * 2018-10-25 2019-03-12 东南大学 A kind of circular polarisation pulse Cassegrain antenna
KR101938778B1 (en) * 2018-06-28 2019-04-10 엘아이지넥스원 주식회사 Apparatus for Dual Mode Composite Sensor Based on Radio Frequency and Semi-Active Laser
KR101968330B1 (en) 2018-10-16 2019-04-11 엘아이지넥스원 주식회사 Homing apparatus with multiple sensor
KR20230040752A (en) * 2021-09-16 2023-03-23 국방과학연구소 Apparatus and method for detecting the direction of a target using cassegrain antenna

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR860000332B1 (en) * 1980-08-28 1986-04-09 미쯔비시덴끼 가부시기 가이샤 A antenna
KR950010165A (en) * 1993-09-08 1995-04-26 배순훈 Casserole Antenna with Secondary Reflector
KR20140037332A (en) * 2012-09-17 2014-03-27 (주)인텔리안테크놀로지스 Satellite communication antenna

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR860000332B1 (en) * 1980-08-28 1986-04-09 미쯔비시덴끼 가부시기 가이샤 A antenna
KR950010165A (en) * 1993-09-08 1995-04-26 배순훈 Casserole Antenna with Secondary Reflector
KR20140037332A (en) * 2012-09-17 2014-03-27 (주)인텔리안테크놀로지스 Satellite communication antenna

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101775688B1 (en) 2016-12-02 2017-09-06 엘아이지넥스원 주식회사 Apparatus for tracking target using multiple sensor and method thereof
KR101938778B1 (en) * 2018-06-28 2019-04-10 엘아이지넥스원 주식회사 Apparatus for Dual Mode Composite Sensor Based on Radio Frequency and Semi-Active Laser
KR101968330B1 (en) 2018-10-16 2019-04-11 엘아이지넥스원 주식회사 Homing apparatus with multiple sensor
CN109462017A (en) * 2018-10-25 2019-03-12 东南大学 A kind of circular polarisation pulse Cassegrain antenna
KR20230040752A (en) * 2021-09-16 2023-03-23 국방과학연구소 Apparatus and method for detecting the direction of a target using cassegrain antenna
KR102564033B1 (en) * 2021-09-16 2023-08-04 국방과학연구소 Apparatus and method for detecting the direction of a target using cassegrain antenna

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