CN213242813U - Low-sidelobe high-gain polarization convertible resonant antenna - Google Patents
Low-sidelobe high-gain polarization convertible resonant antenna Download PDFInfo
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- CN213242813U CN213242813U CN202020870924.8U CN202020870924U CN213242813U CN 213242813 U CN213242813 U CN 213242813U CN 202020870924 U CN202020870924 U CN 202020870924U CN 213242813 U CN213242813 U CN 213242813U
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- 230000010287 polarization Effects 0.000 title claims abstract description 38
- 239000002184 metal Substances 0.000 claims abstract description 29
- 238000006243 chemical reaction Methods 0.000 claims abstract description 7
- 230000005684 electric field Effects 0.000 claims abstract description 6
- 239000004020 conductor Substances 0.000 claims description 6
- 230000005855 radiation Effects 0.000 abstract description 7
- 241000446313 Lamella Species 0.000 abstract description 4
- 230000005672 electromagnetic field Effects 0.000 abstract description 2
- 238000007789 sealing Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000000737 periodic effect Effects 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000012938 design process Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
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Abstract
The utility model discloses a convertible resonant antenna of high gain polarization of low vice lamella belongs to high gain antenna technical field, including sealing the resonant cavity and being located the linear polarization feed source that seals the resonant cavity, seal the resonant cavity and include the ground plate, can realize the partial reflecting surface of polarization conversion function and the metal electric wall and the metal magnetic wall that set up all around at partial reflecting surface and ground plate. The utility model avoids the feed network of the traditional high-gain circular polarized antenna, and has simpler structure; the electromagnetic wave emitted by the linear polarization feed source realizes linear-circular polarization conversion through a partial reflection surface to form circular polarization radiation of an aperture surface, and meanwhile, the electric field emitted by the feed source is restrained by a metal electric wall parallel to the electric field direction and the restraint condition of a magnetic field by a magnetic wall parallel to the magnetic field direction are utilized, so that the leakage of fringe fields does not occur on the four walls of the electromagnetic field excited by the feed source, and more uniform field distribution is formed on the aperture surface to effectively reduce the secondary lobe level of the antenna and improve the radiation characteristic.
Description
Technical Field
The utility model belongs to the technical field of the high-gain antenna, concretely relates to convertible resonant antenna of high-gain polarization of low vice lamella.
Background
The fields of modern radar, satellite communication and the like generally need to use a circular polarized antenna with higher gain. It is often necessary to use a feed network to achieve circular polarization amplitude and phase conditions. On the other hand, the cell array is usually adopted to achieve higher gain, and therefore, the feeding complexity and the influence of mutual coupling between cells on the antenna performance are problems. Practical use of such antennas is affected by higher sidelobes of the antenna radiation pattern due to leakage of fringing fields and aperture field maldistribution.
SUMMERY OF THE UTILITY MODEL
Utility model purpose: an object of the utility model is to provide a convertible resonant antenna of high-gain polarization of low vice lamella has solved the complicated and under the less condition of bore face of current high-gain circular polarized antenna feed, because the higher problem of vice lamella that leads to antenna radiation directional diagram of fringe field's leakage and bore field distribution inequality.
The technical scheme is as follows: in order to realize the purpose of the utility model, the utility model adopts the following technical scheme:
a high-gain polarization convertible resonant antenna with low side lobes comprises a closed resonant cavity and a linear polarization feed source positioned in the closed resonant cavity, wherein the closed resonant cavity comprises a ground plate and a partial reflection surface capable of realizing a polarization conversion function, and a metal electric wall and a metal magnetic wall are arranged on the periphery of the ground plate and the partial reflection surface. The feed source is composed of a microstrip patch antenna and is arranged in the middle of the grounding plate.
The metal electric wall is parallel to the direction of the electric field excited by the feed source, and the metal magnetic wall is parallel to the direction of the magnetic field excited by the feed source.
The metal magnetic wall is composed of artificial magnetic conductors.
The center distance between the partial reflection surface and the metal grounding plate satisfies d ═ 1/2+ n/2) lambda0Wherein λ is0Is the free space wavelength of the electromagnetic wave with the center frequency, and n is an integer.
The partial reflection surface has a polarization transformation function and is formed by periodically arranging a plurality of metal patch units in two orthogonal directions, and the period lengths of the metal patch units in the two orthogonal directions are equal.
Has the advantages that: compared with the prior art, the utility model avoids the feed network of the traditional high-gain antenna, and has simpler structure; the linear polarized wave radiated by the feed source can be changed into circular polarized wave by utilizing the partial reflecting surface with the polarization conversion function; meanwhile, the earth plate, the metal electric wall and the metal magnetic wall around the partial reflection surface form a fully-closed cavity, the electromagnetic field excited by the feed source does not leak in the fringe field on the four walls under the constraint condition of the metal electric wall on the electric field excited by the feed source and the constraint condition of the metal magnetic wall on the magnetic field excited by the feed source, and more uniform field distribution is formed on the aperture plane, so that the secondary lobe level of the antenna is effectively reduced, and the radiation characteristic is improved.
Drawings
FIG. 1 is a schematic diagram of the overall structure of a low sidelobe high gain polarization switchable resonator antenna;
FIG. 2 is a side view of a low sidelobe high gain polarization switchable resonator antenna;
FIG. 3 is a schematic view of a partially reflective surface configuration;
FIG. 4 is a schematic structural view of an artificial magnetic conductor;
FIG. 5 is a schematic view of a periodic cell structure of a partially reflective surface;
FIG. 6 is a schematic view of a periodic cell structure of an artificial magnetic conductor;
FIG. 7 is a graph of the reflection coefficient of a low sidelobe high gain polarization switchable resonant antenna;
FIG. 8 is a graph of gain versus axial ratio frequency response for a low sidelobe, high-gain polarization switchable resonant antenna;
fig. 9 is a 0 degree azimuth pattern for a low sidelobe high gain polarization switchable resonator antenna;
fig. 10 is an azimuth plane-90 degree pattern for a low sidelobe high gain polarization switchable resonator antenna.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and the detailed description.
As shown in fig. 1, a high-gain polarization transformable resonant antenna with low sidelobe comprises a closed resonant cavity 2 and a linear polarization feed 1 located in the closed resonant cavity 2. The linearly polarized feed source 1 is constituted by a microstrip patch antenna.
As shown in fig. 2-4, the closed resonant cavity 2 includes a grounding plate 21, a partial reflection surface 22 with polarization transformation function, a grounding plate 21, and a metal electric wall 24 and a metal magnetic wall 25 arranged around the partial reflection surface 22, wherein the metal electric wall 24 is parallel to the direction of the electric field excited by the feed source, the magnetic wall 25 is parallel to the direction of the magnetic field excited by the feed source, and the magnetic wall 25 is formed by an artificial magnetic conductor 26.
The center distance between the ground plate 21 and the partial reflection surface 22 satisfies d ═ 1/2+ n/2 λ0In which λ is0N is 0,1,2. Wherein n is an integer.
The partial reflection surface 22 is formed by periodically arranging a plurality of metal patch units 23 in two orthogonal directions, as shown in fig. 5, the period lengths of the metal patch units 23 in the two orthogonal directions are equal, and are both Pf。
To facilitate the explanation of the design process of each structural parameter, the structural parameters are given as follows: the side length 2w of the metal patch unit 23 is 4.1mm, and the period is Pf7mm, the period of the metal square unit of the artificial magnetic conductor 26 is Pa3.4mm on a side 2a 2.9mm and the partially reflecting surface 22 on a side 40mm (about 2 λ)0) The center frequency f is 16.2GHz, the center distance between the grounding plate 21 and the partial reflection surface 22 is 11mm, and d is approximately equal to 1/2 lambda0Wherein λ is0The free space wavelength of an electromagnetic wave at a center frequency. The aperture of the antenna is 2 lambda0*2λ0。
Selecting high-frequency simulation software such as HFSS of Ansoft company, Microwave Studio CST of CST company and the like, and performing analog simulation on a computer to obtain: as shown in the reflection coefficient graph of fig. 7 and the gain and axial ratio frequency response graph of fig. 8, it can be seen that the gain of the antenna reaches 14.6dBi and the axial ratio reaches 1dB at the center frequency f of 16.2 GHz; the 0 degree azimuth radiation pattern of fig. 9 shows that the side lobe level is better than-20 dB; the 90 degree azimuth radiation pattern shown in figure 10 shows that the side lobe level is better than-28 dB. The curves obtained above are actually obtained under given conditions, and similar curves can be obtained by changing the structural parameters.
The above is only the preferred embodiment of the present invention, and it should be noted that: for those skilled in the art, without departing from the principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be considered as the protection scope of the present invention.
Claims (7)
1. A high-gain polarization convertible resonant antenna with low sidelobe is characterized in that: the polarization conversion device comprises a closed resonant cavity (2) and a linear polarization feed source (1) positioned in the closed resonant cavity (2), wherein the closed resonant cavity (2) comprises a grounding plate (21) and a partial reflection surface (22) capable of realizing a polarization conversion function, and a metal electric wall (24) and a metal magnetic wall (25) are arranged on the periphery of the grounding plate (21) and the partial reflection surface (22).
2. A low sidelobe, high gain polarization switchable resonator antenna according to claim 1, wherein: the linear polarization feed source (1) is composed of a microstrip patch antenna, and the linear polarization feed source (1) is arranged in the middle of the grounding plate (21).
3. A low sidelobe, high gain polarization switchable resonator antenna according to claim 1, wherein: the metal electric wall (24) is parallel to the direction of an electric field excited by the feed source, and the metal magnetic wall (25) is parallel to the direction of a magnetic field excited by the feed source.
4. A low sidelobe, high gain polarization switchable resonator antenna according to claim 1, wherein: the partially reflective surface (22) has a polarization conversion function.
5. A low sidelobe, high gain polarization switchable resonator antenna according to claim 3, wherein: the metal magnetic wall (25) is composed of an artificial magnetic conductor (26).
6. A low sidelobe, high gain polarization switchable resonator antenna according to claim 1, wherein: the center distance between the grounding plate (21) and the partial reflection surface (22) satisfies d ═ 1/2+ n/2) lambda0Wherein λ is0Is the free space wavelength of the electromagnetic wave with the center frequency, and n is an integer.
7. A low sidelobe, high gain polarization switchable resonator antenna according to claim 4, wherein: the partial reflection surface (22) is formed by periodically arranging a plurality of metal patch units (23) in two orthogonal directions, and the period lengths of the metal patch units (23) in the two orthogonal directions are equal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020870924.8U CN213242813U (en) | 2020-05-21 | 2020-05-21 | Low-sidelobe high-gain polarization convertible resonant antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020870924.8U CN213242813U (en) | 2020-05-21 | 2020-05-21 | Low-sidelobe high-gain polarization convertible resonant antenna |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213242813U true CN213242813U (en) | 2021-05-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020870924.8U Expired - Fee Related CN213242813U (en) | 2020-05-21 | 2020-05-21 | Low-sidelobe high-gain polarization convertible resonant antenna |
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| Country | Link |
|---|---|
| CN (1) | CN213242813U (en) |
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2020
- 2020-05-21 CN CN202020870924.8U patent/CN213242813U/en not_active Expired - Fee Related
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