CN113904127A - Ultra-wideband high-gain direction-finding antenna based on side lobe suppression antenna feed source - Google Patents
Ultra-wideband high-gain direction-finding antenna based on side lobe suppression antenna feed source Download PDFInfo
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- CN113904127A CN113904127A CN202110966551.3A CN202110966551A CN113904127A CN 113904127 A CN113904127 A CN 113904127A CN 202110966551 A CN202110966551 A CN 202110966551A CN 113904127 A CN113904127 A CN 113904127A
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- 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
- H01Q19/17—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 comprising two or more radiating elements
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The invention discloses an ultra-wideband high-gain direction-finding antenna based on a side lobe suppression antenna feed source, which comprises a parabolic reflector, a main antenna feed source and two side lobe suppression antenna feed sources, wherein the side lobe suppression antenna feed sources are the same as the main antenna feed source and share the parabolic reflector; the two side lobes restrain the antenna feed source to be symmetrically and obliquely arranged, so that the transverse focal length and the longitudinal focal length of the lower end of the frequency are larger, the transverse focal length and the longitudinal focal length of the upper end of the frequency are smaller, and the two side lobes are combined into one path to be output through a one-to-two power divider to form a difference beam. The invention realizes the high-gain side lobe suppression of the high-gain main antenna on the ultra-wideband large parabolic antenna on the premise of not increasing the number of large-caliber antennas.
Description
Technical Field
The invention relates to the technical field of antennas, in particular to an ultra-wideband high-gain direction-finding antenna based on a side lobe suppression antenna feed source.
Background
In a direction-finding system with a specific amplitude, a side lobe suppression antenna is usually adopted to suppress an omnidirectional side lobe of a main antenna, the side lobe suppression antenna and the main antenna are required to work in the same frequency band according to the use requirement of the system, the gain of the side lobe suppression antenna is more than 2dB greater than that of a corresponding airspace side lobe of the main antenna, and the side lobe suppression ratio of the antenna directly influences the precision and the false alarm rate of the direction-finding system.
With the development and use requirements of electronic reconnaissance technology, the direction finding requirement of beyond-line-of-sight high precision is increasingly highlighted, namely, the antenna is required to have a narrow-beam high-gain characteristic. However, the high-gain antenna necessarily has higher side lobes, especially near-range side lobes, and the suppression of the ultra-wideband high-gain near-range side lobes is an urgent problem to be solved in an ultra-long distance direction-finding system.
A high-gain parabolic antenna is often selected as an over-the-horizon antenna in an over-the-horizon reconnaissance system, the frequency high-end gain is larger than 48dBi, the near-region side lobe is larger than 30dBi, and the gain of the side lobe suppression antenna is required to be larger than 32 dBi. In the prior art, two pairs of ultra-wideband high-gain fixed directional antennas are adopted to realize the suppression of near-zone side lobes on the left side and the right side of a main antenna, so that the antenna is complex in composition, large in size and high in cost, and the main beam airspace of the side lobe suppression antenna cannot be well overlapped with the near-zone side lobe airspace of the main antenna.
Disclosure of Invention
In order to solve the problems, the invention provides the ultra-wideband high-gain direction-finding antenna based on the side lobe suppression antenna feed source, which can realize the full-band overlapping of a main beam airspace of the side lobe suppression antenna and a side lobe airspace of a main antenna, reduce the complexity of a system, reduce the size and the weight of the system and reduce the cost.
The technical scheme adopted by the invention is as follows:
an ultra-wideband high-gain direction-finding antenna based on a side lobe suppression antenna feed source comprises a parabolic reflector, a main antenna feed source and two side lobe suppression antenna feed sources, wherein the side lobe suppression antenna feed sources are the same as the main antenna feed source and share the parabolic reflector; the two side lobes restrain the antenna feed source to be symmetrically and obliquely arranged, so that the transverse focal length and the longitudinal focal length of the lower end of the frequency are larger, the transverse focal length and the longitudinal focal length of the upper end of the frequency are smaller, and the two side lobes are combined into one path to be output through a one-to-two power divider to form a difference beam.
Further, in the axial direction of the parabolic reflector, the central frequency phase center point of the primary antenna feed is disposed at the focal point of the parabolic reflector.
Furthermore, the relative distance between the minor lobe suppression antenna feed source and the main antenna feed source in the direction away from the parabolic reflector is d1, namely, the minor lobe suppression antenna is axially offset, so that the gain of the minor lobe suppression antenna is reduced compared with that of the main antenna, the beam is widened, and good suppression of a minor lobe in a near region is realized, and the axial offset distance d1 is taken as a rule to ensure that a major lobe directional diagram of the minor lobe suppression antenna is widened but no pit appears.
Furthermore, in the transverse direction of the parabolic reflector, the main antenna feed source is arranged in the middle, the two auxiliary lobe suppression antenna feed sources are arranged on two sides of the main antenna feed source, the relative distance between the top ends is d2, so that the main lobe directional diagram and the main antenna close-zone auxiliary lobe are in the same airspace, and the transverse focal offset distance d2 is determined by the low-frequency-point main antenna auxiliary lobe airspace.
Furthermore, the two side lobe suppression antenna feed sources are respectively inclined by an angle theta to realize that a main lobe airspace of the side lobe suppression antenna and a near-region side lobe airspace of the main antenna are overlapped in a full frequency band, and the inclination angle theta enables the ratio of free space wavelength lambda corresponding to different radiation frequencies of the feed sources to the frequency point feed source phase center to be transversely deviated from the focus of the parabolic reflector to be equal.
Furthermore, the main antenna feed source and the side lobe suppression antenna feed source are in flat and long strip-shaped structures.
Furthermore, the main antenna feed source and the side lobe suppression antenna feed source are ultra wide band constant beam antennas, and the phase center position changes on the feed source axis along with the frequency change.
The invention has the beneficial effects that:
(1) on the premise of not increasing the number of large-caliber antennas, the invention can realize the high-gain side lobe suppression of a high-gain main antenna (more than 40dBi) on an ultra-wideband (more than 7.5: 1) large-scale parabolic antenna.
(2) Compared with the prior art that the side lobe suppression is realized by adopting a plurality of single large-caliber (about 1/4 of the diameter of the main reflector antenna), the invention greatly reduces the complexity of the system, reduces the size and the weight of the system and also reduces the cost.
Drawings
FIG. 1 is a diagram of the positional relationship of a primary antenna feed and a side lobe suppression antenna feed in accordance with an embodiment of the present invention;
FIG. 2 is a diagram of the positional relationship of a primary antenna feed, a secondary lobe canceling antenna feed, and a parabolic reflector in accordance with an embodiment of the present invention;
FIG. 3 is a 0.8GHz directional diagram of an ultra-wideband high-gain direction-finding antenna based on a side lobe suppression antenna feed according to an embodiment of the present invention;
FIG. 4 is a 3GHz directional diagram of an ultra-wideband high-gain direction-finding antenna based on a side lobe suppression antenna feed according to an embodiment of the invention;
fig. 5 shows a 6GHz directional diagram of an ultra-wideband high-gain direction-finding antenna based on a side lobe suppression antenna feed according to an embodiment of the present invention.
The reference numerals are explained below:
| reference numerals | Name (R) |
| 1 | |
| 2 | Side lobe suppression antenna feed |
| d1 | Axial offset focal length |
| d2 | Lateral offset focal length |
| θ | Inclination angle |
| f | Focal length of parabolic reflector |
Detailed Description
In order to more clearly understand the technical features, objects, and effects of the present invention, specific embodiments of the present invention will now be described. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment provides an ultra-wideband high-gain direction-finding antenna based on a side lobe suppression antenna feed source, which comprises a parabolic reflector, a main antenna feed source 1 and two side lobe suppression antenna feed sources 2, wherein the side lobe suppression antenna feed sources 2 are the same as the main antenna feed source 1 and share the parabolic reflector, the position relationship between the main antenna feed source 1 and the side lobe suppression antenna feed sources 2 is shown in figure 1, and the position relationship between the main antenna feed source 1, the side lobe suppression antenna feed sources 2 and the parabolic surface is shown in figure 2. The two side lobes restrain the antenna feed source 2 from being symmetrically and obliquely arranged, so that the transverse focal length and the longitudinal focal length of the lower end of the frequency are larger, the transverse focal length and the longitudinal focal length of the upper end of the frequency are smaller, and the two side lobes are combined into one path to be output through a one-to-two power divider to form a difference beam.
In particular, in the axial direction of the parabolic reflector: the central frequency phase center point of the main antenna feed source 1 is arranged on the focus of the parabolic reflector, the relative distance between the auxiliary lobe suppression antenna feed source 2 and the main antenna feed source 1 in the direction far away from the parabolic reflector is d1, namely, the axial deflection is performed, so that the gain of the auxiliary lobe suppression antenna is reduced compared with that of the main antenna, the wave beam is widened, good suppression of the auxiliary lobe in a near area is realized, and the axial deflection distance d1 is taken as a rule to ensure that the main lobe directional diagram of the auxiliary lobe suppression antenna is widened but no pit is generated.
In particular, in the transverse direction of the parabolic reflector: the main antenna feed source 1 is arranged in the middle, the two auxiliary lobe suppression antenna feed sources 2 are arranged on two sides of the main antenna feed source 1, the relative distance between the top ends is d2, the main lobe directional diagram and the main antenna close-zone auxiliary lobe are in the same airspace, and the transverse focal offset distance d2 is determined by the low-frequency point main antenna auxiliary lobe airspace. The two side lobe suppression antenna feed sources 2 are respectively inclined by an angle theta to realize that a main lobe airspace of the side lobe suppression antenna and a near-region side lobe airspace of the main antenna are overlapped in a full frequency band, and the inclination angle theta enables the ratio of free space wavelength lambda corresponding to different radiation frequencies of the feed sources to the frequency point feed source phase center transversely deviated from the focus of the parabolic reflector to be equal.
In a preferred embodiment of the present invention, the main antenna feed 1 and the side lobe suppression antenna feed 2 are in a flat profile elongated structure.
In a preferred embodiment of the invention, the primary antenna feed 1 and the side lobe suppressing antenna feed 2 are ultra wide band constant beam antennas and the phase centre position varies on the feed axis with frequency variation.
In a preferred embodiment of the present invention, based on a large parabolic main antenna, the feed is a log periodic antenna, the aperture of the parabolic antenna is 7.5 meters, the axial defocusing distance d1 of the minor lobe suppression antenna feed 2 is 180mm, the transverse defocusing distance d2 is 220mm, the inclination angle θ is 15 °, the working frequency range is: 0.8-6 GHz, and the gain of the center frequency is more than 30 dBi. As shown in fig. 3-5, the difference beam of the side lobe suppression antenna realizes perfect suppression of three side lobes in the near zone of the main antenna.
It should be noted that the terms "center", "upper", "lower", "left", "right", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships conventionally arranged when the present invention is used, and are only used for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
Claims (7)
1. An ultra-wideband high-gain direction-finding antenna based on a side lobe suppression antenna feed source is characterized by comprising a parabolic reflector, a main antenna feed source and two side lobe suppression antenna feed sources, wherein the side lobe suppression antenna feed sources are the same as the main antenna feed source and share the parabolic reflector; the two side lobes restrain the antenna feed source to be symmetrically and obliquely arranged, so that the transverse focal length and the longitudinal focal length of the lower end of the frequency are larger, the transverse focal length and the longitudinal focal length of the upper end of the frequency are smaller, and the two side lobes are combined into one path to be output through a one-to-two power divider to form a difference beam.
2. The ultra-wideband high-gain direction-finding antenna based on a side-lobe suppression antenna feed according to claim 1, wherein the center frequency phase center point of the primary antenna feed is disposed at the focal point of the parabolic reflector in the axial direction of the parabolic reflector.
3. The ultra-wideband high-gain direction-finding antenna based on a side lobe suppression antenna feed as claimed in claim 2, wherein the side lobe suppression antenna feed is at a relative distance d1 from the main antenna feed in a direction away from the parabolic reflector, i.e. the axial offset is used to reduce the gain of the side lobe suppression antenna compared with the main antenna, to widen the beam, to achieve good suppression of the side lobe in the near region, and the axial offset distance d1 is determined to ensure that the side lobe suppression antenna main lobe pattern is widened but no pit is generated.
4. The ultra-wideband high-gain direction-finding antenna based on the secondary lobe suppression antenna feed source as claimed in claim 1, wherein in the transverse direction of the parabolic reflector, the main antenna feed source is arranged in the middle, two secondary lobe suppression antenna feed sources are arranged on two sides of the main antenna feed source, the top end relative distance is d2, so as to realize that the main lobe directional diagram and the main antenna near-region secondary lobe are in the same spatial domain, and the transverse focus offset distance d2 is determined by the low-frequency point main antenna secondary lobe spatial domain.
5. The ultra-wideband high-gain direction-finding antenna based on the side lobe suppression antenna feed source according to claim 4, wherein the two side lobe suppression antenna feed sources are respectively inclined by an angle theta to realize that a main lobe airspace of the side lobe suppression antenna and a near-zone side lobe airspace of the main antenna are overlapped in a full frequency band, and the inclination angle theta enables the ratio of free space wavelength lambda corresponding to different radiation frequencies of the feed sources to the frequency point feed source phase center which is transversely deviated from the focus of the parabolic reflector to be equal.
6. The ultra-wideband high-gain direction-finding antenna based on the side lobe suppression antenna feed according to any one of claims 1 to 5, wherein the main antenna feed and the side lobe suppression antenna feed are flat-shaped elongated structures.
7. An ultra-wideband high-gain direction-finding antenna based on a side lobe suppression antenna feed as claimed in any of claims 1-5 wherein the primary and side lobe suppression antenna feeds are ultra-wideband constant beam antennas and the phase centre position varies with frequency variation on the feed axis.
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| CN202110966551.3A CN113904127B (en) | 2021-08-23 | 2021-08-23 | Ultra-wideband high-gain direction-finding antenna based on side lobe suppression antenna feed source |
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| CN202110966551.3A CN113904127B (en) | 2021-08-23 | 2021-08-23 | Ultra-wideband high-gain direction-finding antenna based on side lobe suppression antenna feed source |
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| CN113904127A true CN113904127A (en) | 2022-01-07 |
| CN113904127B CN113904127B (en) | 2023-04-11 |
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Citations (8)
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|---|---|---|---|---|
| US5134423A (en) * | 1990-11-26 | 1992-07-28 | The United States Of America As Represented By The Secretary Of The Air Force | Low sidelobe resistive reflector antenna |
| US5341150A (en) * | 1988-09-28 | 1994-08-23 | Georgia Tech Research Corp. | Low sidelobe reflector |
| US20020126063A1 (en) * | 2001-03-02 | 2002-09-12 | Strickland Peter C. | Rectangular paraboloid truncation wall |
| US20030038753A1 (en) * | 2001-08-23 | 2003-02-27 | Mahon John P. | High gain, low slide lobe dual reflector microwave antenna |
| CN105226398A (en) * | 2015-08-28 | 2016-01-06 | 南京理工大学 | Based on the shaping method of the satellite-borne multi-beam reflector antenna of bat algorithm |
| CN111786126A (en) * | 2020-08-03 | 2020-10-16 | 常熟达顺威尔通信技术有限公司 | RDSS (radio data system) and VSAT (very small aperture terminal) composite parabolic antenna device |
| CN112909559A (en) * | 2021-02-03 | 2021-06-04 | 南京理工大学 | Offset-feed type reflecting surface sum-difference network antenna |
| CN113078471A (en) * | 2020-01-03 | 2021-07-06 | 南京大学 | Reflecting surface sum-difference network antenna |
-
2021
- 2021-08-23 CN CN202110966551.3A patent/CN113904127B/en active Active
Patent Citations (8)
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|---|---|---|---|---|
| US5341150A (en) * | 1988-09-28 | 1994-08-23 | Georgia Tech Research Corp. | Low sidelobe reflector |
| US5134423A (en) * | 1990-11-26 | 1992-07-28 | The United States Of America As Represented By The Secretary Of The Air Force | Low sidelobe resistive reflector antenna |
| US20020126063A1 (en) * | 2001-03-02 | 2002-09-12 | Strickland Peter C. | Rectangular paraboloid truncation wall |
| US20030038753A1 (en) * | 2001-08-23 | 2003-02-27 | Mahon John P. | High gain, low slide lobe dual reflector microwave antenna |
| CN105226398A (en) * | 2015-08-28 | 2016-01-06 | 南京理工大学 | Based on the shaping method of the satellite-borne multi-beam reflector antenna of bat algorithm |
| CN113078471A (en) * | 2020-01-03 | 2021-07-06 | 南京大学 | Reflecting surface sum-difference network antenna |
| CN111786126A (en) * | 2020-08-03 | 2020-10-16 | 常熟达顺威尔通信技术有限公司 | RDSS (radio data system) and VSAT (very small aperture terminal) composite parabolic antenna device |
| CN112909559A (en) * | 2021-02-03 | 2021-06-04 | 南京理工大学 | Offset-feed type reflecting surface sum-difference network antenna |
Non-Patent Citations (2)
| Title |
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| AHMED A. KISHK ET AL.: "Small Reflector Antenna With Low Sidelobes" * |
| 杨晓蓉等: "影响反射面天线副瓣性能的机理" * |
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| CN113904127B (en) | 2023-04-11 |
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