CN115458912A - High-isolation double-horn antenna structure - Google Patents
High-isolation double-horn antenna structure Download PDFInfo
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- CN115458912A CN115458912A CN202211054663.2A CN202211054663A CN115458912A CN 115458912 A CN115458912 A CN 115458912A CN 202211054663 A CN202211054663 A CN 202211054663A CN 115458912 A CN115458912 A CN 115458912A
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- 238000002955 isolation Methods 0.000 title claims abstract description 40
- 239000004020 conductor Substances 0.000 claims description 9
- 230000009977 dual effect Effects 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 3
- 230000005855 radiation Effects 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000004088 simulation Methods 0.000 description 11
- 238000010586 diagram Methods 0.000 description 9
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/52—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure
- H01Q1/521—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure reducing the coupling between adjacent antennas
- H01Q1/525—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure reducing the coupling between adjacent antennas between emitting and receiving 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
Abstract
The invention discloses a high-isolation double-horn antenna structure, which comprises a choke sleeve, a rectangular horn, a rectangular waveguide and a coaxial feed structure, wherein one end of the rectangular horn is connected with the choke sleeve, and the other end of the rectangular horn is connected with the rectangular waveguide; the coaxial feed structure is arranged on one side of the rectangular waveguide and feeds the antenna structure. The invention has the beneficial effects that: the invention can realize the improvement of the isolation of the two horn antennas by utilizing the three-layer stepped choke sleeve structure. After the three layers of stepped choke sleeves are added, the VSWR of a single rectangular horn antenna is still less than 1.25, good radiation of the antenna can be realized, the gain is improved by 1dB, and the main lobe direction cannot follow the three layers of stepped chokesChange by addition of flow sleeves, at f 1 —f 2 The isolation of the two horn antennas is improved by 25dB. The invention can improve the isolation of the two antennas in a wider frequency band by utilizing the three layers of step-shaped choke sleeves and adjusting the depth of each loop-shaped groove. The three-layer stepped choke sleeve has a simple structure, is easy to process, and is suitable for improving the isolation degree between two antennae only one antenna in a transmitting and receiving antenna is a horn antenna.
Description
Technical Field
The invention relates to the technical field of antennas, in particular to a high-isolation double-horn antenna structure.
Background
The linear frequency modulation continuous wave radar has the advantages of high distance resolution, no distance blind area, simple structure, small size, light weight, low power consumption, low cost and the like, and is widely concerned and applied to various fields. The LFMCW radar transmits and receives simultaneously, and the isolation of the two receiving and transmitting branches seriously influences the overall performance of the radar. The leakage of the transmitted signal to the receiver becomes a noise signal, and will cause the echo signal of the target to be submerged in the noise, so that the radar cannot detect the target at all, and thus cannot obtain the corresponding information of the target. Therefore, the isolation problem of the transmitting and receiving antennas of the LFMCW radar is related to whether the radar can accurately detect the success or failure of the target information.
The isolation of a multi-antenna system can be improved by placing the distance between the receiving and transmitting antennas far enough, but the size of the whole radar is limited by requirements and cannot be infinitely far, so that the isolation of the antennas cannot meet the requirements. Therefore, it is important to improve the isolation between the transmitting and receiving antennas.
Disclosure of Invention
In view of the defects of the prior art, the invention aims to provide a high-isolation dual-horn antenna structure, and by the structure, the isolation of two horn antennas is improved, the antenna structure is simple, the size is small, the isolation between the two horn antennas can be effectively improved, and a radar can accurately measure a target signal.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a high-isolation dual-horn antenna structure comprises a choke sleeve, a rectangular horn, a rectangular waveguide and a coaxial feed structure, wherein one end of the rectangular horn is connected with the choke sleeve, and the other end of the rectangular horn is connected with the rectangular waveguide; the coaxial feed structure is arranged on one side of the rectangular waveguide and feeds the antenna structure.
It should be noted that the choke sleeve is composed of a rectangular conductor, and a connecting position which is used for being connected with one end of the rectangular horn and has the same caliber is arranged in the center of the rectangular conductor.
It should be noted that, at least 3 circular grooves with the same width and a step-shaped depth are arranged outwards from the center of the rectangular conductor.
Note that the coaxial feed structure is 50 ohms.
It should be noted that the isolation between the two antennas can be improved in a wider frequency band by adjusting the depth of each loop-back groove.
The invention has the beneficial effects that:
1. the invention can realize the improvement of the isolation of the two horn antennas by utilizing the three-layer stepped choke sleeve structure. After the three layers of stepped choke sleeves are added, the VSWR of a single rectangular horn antenna is still smaller than 1.25, good radiation of the antenna can be achieved, the gain is improved by 1dB, the direction of a main lobe cannot be changed along with the addition of the three layers of stepped choke sleeves, and the isolation of the two horn antennas is improved by 25dB.
2. The invention can improve the isolation of the two antennas in a wider frequency band by utilizing the three layers of step-shaped choke sleeves and adjusting the depth of each loop-shaped groove.
3. The three-layer stepped choke sleeve has a simple structure, is easy to process, and is suitable for improving the isolation degree between two antennae only one antenna in a transmitting and receiving antenna is a horn antenna.
Drawings
FIG. 1 is a schematic structural diagram of a rectangular horn antenna with three additional layers of stepped choke sleeves;
FIG. 2 is a schematic plan view of a rectangular horn antenna;
FIG. 3 is a schematic plan view of a three-layer stepped choke sleeve;
FIG. 4 is a schematic diagram of a simulation structure of two rectangular horn antennas;
FIG. 5 is a diagram illustrating VSWR simulation results of two rectangular horn antennas;
FIG. 6 is a graph showing simulation results of a single rectangular horn antenna gain curve of two rectangular horn antennas;
FIG. 7 is a graph showing simulation results of normalized gain curves of a single rectangular horn antenna of two rectangular horn antennas;
FIG. 8 is a diagram illustrating the results of port1 and port2 isolation simulation for two rectangular horn antennas;
FIG. 9 is a schematic diagram of a structure of two rectangular horn antennas with three layers of stepped chokes;
FIG. 10 is a diagram illustrating the VSWR simulation results of two rectangular horn antennas with three stepped chokes;
FIG. 11 is a diagram illustrating a simulation result of a gain curve of a single horn antenna in two rectangular horn antennas with three stepped choke sleeves;
FIG. 12 is a diagram illustrating the simulation results of normalized gain curves of a single horn antenna in two rectangular horn antennas with three stepped choke sleeves;
fig. 13 is a diagram illustrating a simulation result of the isolation between port1 and port2 of two rectangular horn antennas with three layers of stepped chokes.
Detailed Description
The present invention will be further described with reference to the accompanying drawings, and it should be noted that the present embodiment is based on the technical solution, and the detailed implementation and the specific operation process are provided, but the protection scope of the present invention is not limited to the present embodiment.
As shown in fig. 1, the present invention is a high-isolation dual-horn antenna structure, which includes a choke sleeve, a rectangular horn, a rectangular waveguide and a coaxial feed structure, wherein one end of the rectangular horn is connected to the choke sleeve, and the other end is connected to the rectangular waveguide; the coaxial feed structure is arranged on one side of the rectangular waveguide and feeds the antenna structure.
Furthermore, the choke sleeve is composed of a rectangular conductor, and a connecting position which is used for being connected with one end of the rectangular horn and has the same caliber is arranged in the center of the rectangular conductor.
Furthermore, the rectangular conductor is provided with at least 3 circular grooves which are same in width and distributed in a step shape in depth from the center outwards.
Further, the coaxial feed structure of the present invention is 50 ohms.
Further, the present invention can improve the isolation of the two antennas in a wider frequency band by adjusting the depth of each loop-back groove.
Examples
The invention realizes the effect at f by using a rectangular horn antenna 1 —f 2 The inner VSWR is less than 1.25, the antenna realizes good radiation, and the coverage of the azimuth plane 60 degrees and the pitching plane 30 degrees is realized by adjusting the caliber size of the rectangular horn antenna. According to the invention, the isolation degree of the two rectangular horn antennas in the working frequency band can be improved by adding the three layers of stepped choke sleeves at the aperture of the rectangular horn antenna. The invention utilizes the adjustment of the depths of the three choking sleeve grooves to ensure that the depths of the choking sleeve grooves are distributed in a step shape, and can improve the isolation of the two rectangular horn antennas in a wider working frequency range.
As shown in fig. 1, a rectangular horn antenna with three layers of stepped chokes at least includes: the three-layer stepped choke comprises a three-layer stepped choke sleeve 1, a rectangular horn 2, a rectangular waveguide 3 and a 50-ohm coaxial feed structure 4;
as shown in fig. 2, the rectangular horn antenna has an aperture length Wa =0.8 λ, a width Ha =1.28 λ, and a height Lf =2 λ; rectangular waveguide length wg =0.56 x λ wide Hg =0.256 x λ, high Lg =0.72 x λ;
as shown in fig. 3, the thickness of the three-layer stepped choke sleeve is h =0.48 λ, the wall thickness of the choke sleeve is w1=0.08 λ, the width of the wall gap is w2=0.16 λ, and the three-layer choke sleeve has a groove depth of h1=0.256 λ, h2=0.272 λ and h3=0.304 λ from inside to outside;
as shown in fig. 4, the two rectangular horn antennas are 3.68 x λ apart; the feed axes are all arranged along the same direction.
As shown in fig. 5, f for two rectangular horn antennas is shown 1 —f 2 The result of the inner VSWR parameter. The results show that the VSWR is less than 1.25 and the antenna can achieve better impedance characteristics in the operating band.
As shown in fig. 6 and 7, f for a single rectangular horn antenna of two rectangular horn antennas is given 0 Results of the gain curves, the results show that at f 0 The gain of the horn antenna is 11.2dB; elevation phi =0 half power lobe width up to 36 °, azimuth phi =90 half power lobe width up to 63 °; pitch phi =0 primary to secondary ratio greater than 12dB.
As shown in fig. 8, a simulation result of the isolation between two rectangular horn antennas is shown, and the result shows that two horn antennas f 1 —f 2 The isolation of the inner port1 port and the port2 port is-44 dB-47 dB.
As shown in fig. 9, a structure in which three layers of stepped choke sleeves are added to the apertures of two rectangular horn antennas spaced by 3.68 × λ as shown in fig. 4 is shown in the figure;
as shown in FIG. 10, two rectangular horn antennas with three-layer stepped chokes are shown at f 1 —f 2 The result of the inner VSWR parameter. The results show that the VSWR is less than 1.25 and the antenna can achieve better impedance characteristics in the operating band.
As shown in FIG. 11 and FIG. 12, the two additional three-layer stepped choke sleeve rectangular horn antennas are shown at f 0 Gain curveThe result of (a) shows that at f 0 The gain of the horn antenna is 12.5dB; elevation phi =0 half power lobe width up to 32 °, azimuth phi =90 half power lobe width up to 60 °; pitch phi =0 primary to secondary ratio greater than 14dB.
As shown in fig. 12, a simulation result of the isolation between two rectangular horn antennas with three additional layers of stepped choking sleeves is shown, and the result shows that the two horn antennas f 1 —f 2 The isolation of the port1 port and the port2 port is-69.5 dB-73.5 dB.
As shown in fig. 8 and 13, the results of comparing the front and rear isolation of the rectangular horn antenna with three layers of stepped choke sleeves show that the two horn antennas f 1 —f 2 The increased isolation of the inner port1 and port2 ports by 25dB shows that by adding three layers of stepped chokes, the current is prevented from passing when the surface wave flows through the slots of the chokes, thereby increasing the isolation between the two antennas within the operating band.
Various other changes and modifications to the above-described embodiments and concepts will become apparent to those skilled in the art from the above description, and all such changes and modifications are intended to be included within the scope of the present invention as defined in the appended claims.
Claims (5)
1. A high-isolation dual-horn antenna structure is characterized in that the antenna structure comprises a choke sleeve, a rectangular horn, a rectangular waveguide and a coaxial feed structure, wherein one end of the rectangular horn is connected with the choke sleeve, and the other end of the rectangular horn is connected with the rectangular waveguide; the coaxial feed structure is arranged on one side of the rectangular waveguide and feeds the antenna structure.
2. The high-isolation dual-horn antenna structure as claimed in claim 1, wherein the choke sleeve is formed of a rectangular conductor, and a connection position having the same caliber and used for being connected to one end of the rectangular horn is provided at the center of the rectangular conductor.
3. The structure of claim 2, wherein at least 3 loop-shaped slots with the same width and a step-shaped depth are disposed outward from the center of the rectangular conductor.
4. A high isolation dual horn antenna structure as claimed in claim 1 wherein the coaxial feed structure is 50 ohms.
5. The high-isolation dual-horn antenna structure of claim 3, wherein the isolation of the two antennas can be improved in a wider frequency band by adjusting the depth of each loop-shaped groove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211054663.2A CN115458912A (en) | 2022-08-31 | 2022-08-31 | High-isolation double-horn antenna structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211054663.2A CN115458912A (en) | 2022-08-31 | 2022-08-31 | High-isolation double-horn antenna structure |
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| Publication Number | Publication Date |
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| CN115458912A true CN115458912A (en) | 2022-12-09 |
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| CN202211054663.2A Pending CN115458912A (en) | 2022-08-31 | 2022-08-31 | High-isolation double-horn antenna structure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115986434A (en) * | 2023-03-16 | 2023-04-18 | 安徽大学 | Multiple-input multiple-output millimeter wave antenna array |
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| CN106785469A (en) * | 2016-12-02 | 2017-05-31 | 航天恒星科技有限公司 | Double-frequency coaxial feed and the antenna with it |
| CN109478725A (en) * | 2016-09-23 | 2019-03-15 | 康普技术有限责任公司 | Double frequency-band paraboloid microwave antenna system |
| CN110289483A (en) * | 2019-06-17 | 2019-09-27 | 北京达顺威尔科技有限公司 | Dual-band dual-circular polarization navigation TT&C antenna feed |
| CN111313156A (en) * | 2019-11-28 | 2020-06-19 | 中国科学院国家天文台 | Medium-loaded ultra-wideband corrugated horn feed source |
| CN212968070U (en) * | 2020-10-23 | 2021-04-13 | 西安安坦纳微波科技有限公司 | Horn antenna |
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2022
- 2022-08-31 CN CN202211054663.2A patent/CN115458912A/en active Pending
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115986434A (en) * | 2023-03-16 | 2023-04-18 | 安徽大学 | Multiple-input multiple-output millimeter wave antenna array |
| CN115986434B (en) * | 2023-03-16 | 2023-06-09 | 安徽大学 | Multiple-input multiple-output millimeter wave antenna array |
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