KR101874741B1 - Feed horn assembly of small parabolic antenna for multimode monopulse using tm01 mode coupler - Google Patents
Feed horn assembly of small parabolic antenna for multimode monopulse using tm01 mode coupler Download PDFInfo
- Publication number
- KR101874741B1 KR101874741B1 KR1020170035991A KR20170035991A KR101874741B1 KR 101874741 B1 KR101874741 B1 KR 101874741B1 KR 1020170035991 A KR1020170035991 A KR 1020170035991A KR 20170035991 A KR20170035991 A KR 20170035991A KR 101874741 B1 KR101874741 B1 KR 101874741B1
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- KR
- South Korea
- Prior art keywords
- signal
- mode
- feed horn
- order mode
- circular waveguide
- Prior art date
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/27—Adaptation for use in or on movable bodies
- H01Q1/28—Adaptation for use in or on aircraft, missiles, satellites, or balloons
- H01Q1/288—Satellite antennas
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
- H01Q13/02—Waveguide horns
-
- 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
- H01Q15/16—Reflecting surfaces; Equivalent structures curved in two dimensions, e.g. paraboloidal
-
- 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
- H01Q15/24—Polarising devices; Polarisation filters
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q19/00—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic
- H01Q19/10—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces
- H01Q19/12—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces wherein the surfaces are concave
- H01Q19/13—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces wherein the surfaces are concave the primary radiating source being a single radiating element, e.g. a dipole, a slot, a waveguide termination
- H01Q19/132—Horn reflector antennas; Off-set feeding
Abstract
The present invention relates to a feed horn assembly for a small monopulse satellite communication antenna using a high-order mode coupler that meets a pattern standard and a cross polarization specification in a wide band by using a high-order mode coupler that generates a tracking signal using a TM01 mode signal. will be.
The feed horn assembly for a small monopulse satellite communication antenna using a higher order mode coupler according to the present invention includes a feeding horn 32 for receiving a signal and a signal for communication using a circular polarized signal outputted from the feeding horn 32 A circular waveguide 33 for simultaneously generating a TE11 mode and a tracking signal TM01 mode and a plurality of slots 34ba and an H plane TEE connection are formed in the circular waveguide 33, A high-order mode coupler 34 for coupling the tracking signal among the received signals, and an orthogonal mode polarizer 35 for separating the transmission signal and the reception signal from the transmission signal.
Description
The present invention relates to a feed horn assembly for a satellite communication antenna for tracking a multimode monopulse satellite, and more particularly, to a high-order mode coupler for generating a tracking signal using a TM01 mode signal, To a feed horn assembly for a small monopulse satellite communication antenna using a higher order mode coupler that meets the cross polarization specification.
The monopulse tracking system, derived from the radar system, allows the mobile platform to pinpoint and track the position of the target that it is aiming at.
A commonly used multi-horn monopulse tracking system places a plurality of horns on an antenna and uses them to extract a null pattern generated.
However, as described above, the multi-horn monopulse tracking system is difficult to satisfy the requirements of the antenna pattern (co-pol and cross-pol) due to the space constraints of mounting the plurality of horns on the antenna.
If a large base station antenna is applied to a large base station installed at a fixed position on the ground, a higher mode signal other than the basic mode signal is generated in a single horn assembly and a null pattern is extracted therefrom .
The large base station antenna uses a high-order mode coupler with many slots to receive a broadband beacon signal.
However, in a mobile platform such as a vehicle, a plurality of horns can not be installed as in the case of the large base station antenna, and there is also a problem in using a high-order mode coupler having a plurality of slots.
On the other hand, the following prior art document discloses a technique relating to a ring focus antenna for monopulse tracking and its feeding horn.
SUMMARY OF THE INVENTION The present invention has been developed to solve the above-mentioned problems, and it is an object of the present invention to provide a high-order mode coupler and antenna pattern (co-pol and cross-pol) And to provide a feed horn assembly for a small monopulse satellite communication antenna using a high-order mode coupler that can be satisfied at the same time.
It is another object of the present invention to provide a feed horn assembly for a small monopulse satellite communication antenna using a high-order mode coupler that satisfies pattern specifications and cross polarization specifications in a wide band at a high speed and high accuracy.
According to an aspect of the present invention, there is provided a feed horn assembly for a small monopulse satellite communication antenna using a high-order mode coupler, comprising: a feed horn for receiving a signal; And a H-plane TEE (H-plane TEE) connection is formed between a plurality of slots and a signal for generating a tracking signal (TM01 mode) A high-order mode coupler for coupling the signal and an orthogonal mode polarizer for separating the transmission signal and the reception signal in the transmission and reception signals.
The inner diameter of the circular waveguide is determined such that the communication signal TE11 mode and the tracking signal TM01 mode are generated from the signal received from the feed horn.
The high-order mode coupler is formed such that a pair of slots formed along the circumferential direction of the circular waveguide are symmetrically opposed to each other so that a signal input to the circular waveguide is introduced into the high-order mode coupler.
And the slot is formed in a rectangular shape having long sides along the circumferential direction of the circular waveguide.
A first port in which a signal is input from the circular waveguide and output to the orthogonal mode polarizer and in which the slot is formed; And a second port that is changed to a signal of a spherical waveguide (TE10 mode) and output to a spherical waveguide.
In the high-order mode coupler, the slot selects only a tracking signal from the communication signal (TE11 mode) and the tracking signal (TM01 mode), and extracts the tracking signal into a spherical waveguide using an H plane T connection .
The orthogonal mode polarizer is characterized by being a septum polarizer.
And a sub-reflector support for coupling the rear surface of the sub-reflector of the reflector antenna is further provided at a front end of the feed horn.
According to the feed horn assembly for a small monopulse satellite communication antenna using the high-order mode coupler of the present invention having the above configuration, a feed horn assembly suitable for a platform moving on the ground is realized, It is possible to provide a monopulse tracking system that is smaller and lighter than the monopulse tracking system used.
1A and 1B are a front perspective view and a rear perspective view showing a reflection plate type antenna apparatus to which a feed horn assembly for a small monopulse satellite communication antenna using a high-order mode coupler according to the present invention is applied.
FIGS. 2A and 2B are a perspective view and a sectional view of a feed horn assembly for a small monopulse satellite communication antenna using a high-order mode coupler according to the present invention;
FIGS. 3A through 3C are a perspective view, an exploded perspective view, and a cross-sectional view illustrating a high-order mode coupler applied to a feed horn assembly for a small monopulse satellite communication antenna using a high-order mode coupler according to the present invention;
4A to 4C are schematic views illustrating a signal synthesizing process using a feed horn assembly for a small monopulse satellite communication antenna using a high-order mode coupler according to the present invention.
5 is a graph illustrating a result of measuring a radiation pattern of a basic mode (sum pattern) and a higher-order mode (difference pattern) of a reflection plate type antenna device to which a feed horn assembly for a small monopulse satellite communication antenna using a high- FIG.
Hereinafter, a feed horn assembly for a small monopulse satellite communication antenna using a high-order mode coupler according to the present invention will be described in detail with reference to the accompanying drawings.
1A and 1B, a
The
In addition, the
2A and 2B show a feed horn assembly for a small monopulse satellite communication antenna using a high-order mode coupler according to the present invention.
The
The high-
The
The
The
The
The inner diameter of the
The high-
The high-
The high-
The
The
A plurality of slots 34ba are formed in the inner wall of the
Here, the fact that the signal is coupled means that one of the signals generated in the
The coupling may be variously performed depending on the shape of the slot 34ba. In the present invention, the slot 34ba may be formed in a rectangular shape having long sides along the circumferential direction of the
Also, a signal introduced into the
The
A signal is transmitted from the
A
The
The
The feeding horn assembly for a small monopulse satellite communication antenna using the high-order mode coupler according to the present invention having the above-described structure performs the signal combining process as shown in Figs. 4A to 4C.
4A, when the source horn is moved up and down, left and right, and a signal is applied to the
Accordingly, a high-order mode (TM01 mode) signal can be coupled using the slot 34ba formed in the
The high-
4B shows an electric field of the high-order mode signal TM01 generated inside the
As described above, according to the feed horn assembly for a small monopulse satellite communication antenna using the high-order mode coupler of the present invention, it is possible to satisfy the antenna radiation pattern standard as shown in FIG. 5, It is possible to provide a miniaturized and lightweight monopulse tracking antenna in which a null pattern of a higher-order mode signal (difference signal) is generated.
In addition, the present invention can provide a monopulse tracking system with faster and higher accuracy due to the feed horn assembly, which is also suitable for platforms moving on the ground.
1: reflector antenna
10: Main reflector
20:
30: feed horn assembly
31: auxiliary reflector assembly
32: Feeding horn
33: Circular waveguide
34: Higher order mode coupler
34a: Housing
34b:
34ba: Slot
34c: second port
34d: Through hole
34e: dummy port
35: Septum deflector
Claims (8)
A circular waveguide for simultaneously generating a communication signal (TE11 mode) and a tracking signal (TM01 mode) using the circular polarization signal output from the feed horn,
A high-order mode coupler in which a plurality of slots and an H-plane TEE are formed and coupling the tracking signal among the signals received by the circular waveguide;
And an orthogonal mode polarizer for separating the transmission signal and the reception signal from the transmission / reception signal,
Wherein the high-order mode coupler is formed such that a pair of slots formed along a circumferential direction of the circular waveguide are symmetrically opposed to each other so that a signal input to the circular waveguide is introduced into the high-order mode coupler,
A first port in which a signal is input from the circular waveguide and output to the orthogonal mode polarizer and in which the slot is formed; (TE10 mode) of the spherical waveguide and outputting the signal to the spherical waveguide,
Wherein a through hole is formed in the middle of the housing to penetrate the housing in the longitudinal direction of the circular waveguide, the width of the through hole is larger than the outer diameter of the first port,
And the width direction of the second port is perpendicular to the longitudinal direction of the circular waveguide. The feed horn assembly for a small monopulse satellite communication antenna using the high order mode coupler.
Wherein the inner diameter of the circular waveguide is determined such that the communication signal TE11 mode and the tracking signal TM01 mode are generated from the signal received from the feed horn. Feeding horn assembly.
Wherein the slot is formed in a rectangular shape having long sides along the circumferential direction of the circular waveguide.
In the higher order mode coupler,
The slot selects only the tracking signal from the communication signal (TE11 mode) and the tracking signal (TM01 mode)
Wherein the tracking signal is extracted as a spherical waveguide using a H plane T connection. ≪ RTI ID = 0.0 > 11. < / RTI >
Wherein the orthogonal mode polarizer is a septum polarizer. ≪ RTI ID = 0.0 > 15. < / RTI > A feed horn assembly for a small monopulse satellite communication antenna using a high order mode coupler.
Wherein the feed horn further comprises a sub reflector support coupled to a rear surface of a sub reflector of the reflector antenna at a front end of the feed horn.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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KR1020170035991A KR101874741B1 (en) | 2017-03-22 | 2017-03-22 | Feed horn assembly of small parabolic antenna for multimode monopulse using tm01 mode coupler |
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KR1020170035991A KR101874741B1 (en) | 2017-03-22 | 2017-03-22 | Feed horn assembly of small parabolic antenna for multimode monopulse using tm01 mode coupler |
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KR101874741B1 true KR101874741B1 (en) | 2018-07-04 |
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KR1020170035991A KR101874741B1 (en) | 2017-03-22 | 2017-03-22 | Feed horn assembly of small parabolic antenna for multimode monopulse using tm01 mode coupler |
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Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2695427B2 (en) * | 1988-03-24 | 1997-12-24 | 三菱電機株式会社 | Antenna feeding circuit |
KR101557781B1 (en) * | 2015-03-04 | 2015-10-06 | 국방과학연구소 | Feed horn assembly of parabolic antenna for multimode monopulse |
-
2017
- 2017-03-22 KR KR1020170035991A patent/KR101874741B1/en active IP Right Grant
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2695427B2 (en) * | 1988-03-24 | 1997-12-24 | 三菱電機株式会社 | Antenna feeding circuit |
KR101557781B1 (en) * | 2015-03-04 | 2015-10-06 | 국방과학연구소 | Feed horn assembly of parabolic antenna for multimode monopulse |
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