CN210607636U - X-frequency-band low-grating-lobe circularly polarized antenna - Google Patents
X-frequency-band low-grating-lobe circularly polarized antenna Download PDFInfo
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- CN210607636U CN210607636U CN201921723468.8U CN201921723468U CN210607636U CN 210607636 U CN210607636 U CN 210607636U CN 201921723468 U CN201921723468 U CN 201921723468U CN 210607636 U CN210607636 U CN 210607636U
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Abstract
The utility model relates to a low grating lamella circular polarized antenna of X frequency channel comprises long horn antenna and baffle polarizer. The long horn antenna adopts a multi-cavity design of a metal partition plate, and the aperture field distribution is improved by filling a medium material at the radiation port surface, so that the antenna gain and aperture efficiency are improved, the narrow zero point width of a directional diagram is ensured, and the grating lobe suppression capability is improved. The long horn antenna is connected with a partition plate polarizer through a flange in a waveguide cascade mode, the partition plate polarizer is a square waveguide with a metal partition plate in the middle, the square waveguide is divided into two rectangular waveguides through the metal partition plate, namely, a transmitting channel and a receiving channel are formed, and the guide ports of the two rectangular waveguides realize coaxial waveguide conversion through a stepped impedance converter. The utility model relates to a low grating lamella circular polarized antenna of X frequency channel adopts the waveguide as major structure, has simplified structural design's complexity, has reduced the link loss, has improved the utilization efficiency of the face back bore, has improved later stage assembly production and equipment debugging efficiency.
Description
Technical Field
The utility model relates to a low grating lamella circular polarized antenna of X frequency channel. Belongs to the technical field of antennas.
Background
For research and analysis of the grating lobe suppression technology of the large-spacing array antenna, the development is very rapid at home and abroad, and the method generally focuses on the array surface arrangement method and can adopt a periodic or non-periodic arrangement mode. For the scheme of the antenna array with large unit spacing, if a periodic arrangement mode is adopted, grating lobes appear in a real space in an array synthesis directional diagram, and the grating lobe level is increased along with the increase of the scanning angle, so that the active sub-array can adopt non-periodic arrangement, and the grating lobe level can be effectively reduced. The active subarray is composed of a plurality of antennas, and each antenna is required to have higher antenna gain and can effectively suppress array grating lobes after combination.
The traditional horn antenna or parabolic antenna has the characteristics of large physical caliber and high gain, but has the difficulties of low caliber efficiency and limited grating lobe suppression capability when being applied as an array unit. The general standard gain horn antenna or parabolic antenna has a low aperture efficiency of about 50-60% due to the uneven distribution of the phase and amplitude of the mouth-face field. The aperture field distribution of a general standard gain horn antenna or a general paraboloid antenna is uneven, the zero point width of a directional diagram is wide, and the standard gain horn antenna or the general paraboloid antenna is positioned outside the grating lobe position of the array factor directional diagram, so that the array grating lobe cannot be effectively inhibited.
SUMMERY OF THE UTILITY MODEL
The technical problem to be solved by the utility model is to provide an X-band low-grating-lobe circularly polarized antenna, which adopts a long horn to improve the gain and the aperture efficiency, improves the aperture field distribution by filling artificial dielectric materials at the radiation aperture surface, and improves the array comprehensive grating lobe inhibition capacity by adopting the multi-cavity design of a metal baffle plate; and the waveguide cascade mode is adopted to be connected with the clapboard polarizer, so that the functions of circularly polarized signal formation and feedback are realized.
The utility model provides a technical scheme that above-mentioned problem adopted does: an X-frequency-band low-grating-lobe circularly polarized antenna comprises a long horn antenna and a partition plate polarizer which are connected with each other, wherein the long horn antenna comprises a feed square waveguide, a horn waveguide and a radiation port surface which are connected in sequence, the feed square waveguide is a standard waveguide and is used for realizing coupling and conversion of signals received and sent by the partition plate polarizer, one side, away from the antenna port surface, of the feed square waveguide is provided with a flange for connecting with the partition plate polarizer, the other side of the feed square waveguide is connected with a small caliber of the horn waveguide, and the radiation port surface is positioned at a large caliber of the horn waveguide and serves as a horn port of the long horn antenna; the baffle polarizer comprises a metal baffle, a transmitting port, a transmitting impedance converter, a receiving port and a receiving impedance converter, the baffle polarizer is a standard square waveguide, is a three-port network and is respectively a transmitting port, a receiving port and an open waveguide port, and the open waveguide port is provided with a flange and is connected with the long horn antenna; the utility model discloses a metal baffle plate, including baffle plate polarizer, metal baffle plate, transmission port and receiving port, metal baffle plate is located the intermediate position of baffle plate polarizer, divide into two rectangular waveguide with the baffle plate polarizer, forms transmission circular polarization formation district and receiving circular polarization transmission area promptly, transmission port and receiving port link to each other with transmission impedance converter, receiving impedance converter respectively, and are located the metal baffle plate both sides, the one side that transmission port and receiving port were kept away from to the metal baffle plate is the ladder face for mode circular polarization signal of quadrature is produced after the metal baffle plate to the mode signal of following the input of transmission port, produces the mode circular polarization signal of quadrature behind the metal baffle plate from the mode signal that the baffle plate polarizer opened waveguide.
Preferably, two mutually perpendicular partition plates are arranged in the horn waveguide, so that the long horn antenna is changed into four radiators from one radiator, and the two partition plates are crossed.
Preferably, the radiation port surface is filled with a polytetrafluoroethylene medium, so that the aperture field distribution is improved, and the aperture efficiency of the horn is improved.
Preferably, the transmitting port and the receiving port are standard SMA ports for inputting or outputting radio frequency signals. Preferably, the transmitting impedance converter and the receiving impedance converter are in a step shape, and the transmitting impedance and the receiving impedance are matched by simulating, optimizing and adjusting the height and the length of the step.
Compared with the prior art, the utility model has the advantages of:
the utility model discloses a long horn antenna adopts metal baffle's many inner chambers design, through filling dielectric material in radiation mouthful face department, improves bore field distribution to improve antenna gain, bore efficiency, guarantee narrower directional diagram zero point width, improve grating lamella inhibition ability. The long horn antenna is connected with a partition plate polarizer through a flange in a waveguide cascade mode, the partition plate polarizer is a square waveguide with a metal partition plate in the middle, the square waveguide is divided into two rectangular waveguides through the metal partition plate, namely, a transmitting channel and a receiving channel are formed, and the guide ports of the two rectangular waveguides realize coaxial waveguide conversion through a stepped impedance converter. The utility model relates to a low grating lamella circular polarized antenna of X frequency channel adopts the waveguide as major structure, has simplified structural design's complexity, has reduced the link loss, has improved the utilization efficiency of the face back bore, has improved later stage assembly production and equipment debugging efficiency. The method specifically comprises the following beneficial effects:
(1) high gain: through waveguide cascade, loss is reduced; the antenna aperture is uniformly distributed in amplitude and phase through the partition plate of the horn antenna, and the antenna gain is improved.
(2) Low axial ratio: through the optimization of integrated design, the circular polarizer realizes that the axial ratio is lower than 1.1 dB.
(3) High integration: through the integrated design, the integration level is improved, the structure is simple, and the assembly and debugging are simple.
Drawings
Fig. 1 is the whole structure diagram of the antenna in the X-band low-grating lobe circular polarized antenna of the present invention.
Fig. 2 is the structure diagram of the long horn antenna in the X-band low-grating lobe circular polarized antenna of the present invention.
Fig. 3 is the front view size diagram of the long horn antenna in the X-band low-grating lobe circular polarized antenna of the present invention.
Fig. 4 is a dimension diagram of the long horn antenna baffle radiation aperture face position in the X-band low-grating lobe circular polarized antenna of the present invention.
Fig. 5 is a dimension diagram of the long horn antenna spacer square waveguide position in the X-band low-grating lobe circular polarized antenna of the present invention.
Fig. 6 is the structure diagram of the baffle polarizer in the X-band low-grating lobe circular polarized antenna of the present invention.
Fig. 7 is the antenna gain test chart of the utility model discloses among the low grating lobe circular polarized antenna of X frequency channel.
Fig. 8 is the utility model discloses antenna 3D directional diagram among the low grating lobe circular polarized antenna of X frequency channel.
Fig. 9 is the antenna axial ratio test chart of the X-band low-grating lobe circular polarized antenna of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the following embodiments.
Referring to fig. 1 to 6, the X-band low-grating-lobe circularly polarized antenna according to the present embodiment is configured to provide a grating lobe suppression capability to a large-pitch array antenna, and includes a long horn antenna 1 and a diaphragm polarizer 2, where:
the long horn antenna 1 comprises a feed square waveguide 1.1, a horn waveguide 1.2 and a radiation opening surface 1.3, the long horn antenna 1 is evolved from a standard horn antenna, in order to improve gain, the horn opening is subjected to extension treatment, and optimization is carried out according to an optimal horn through simulation; the feed square waveguide 1.1 is a standard waveguide and is used for realizing the coupling and conversion of the receiving and sending signals of the clapboard polarizer 2, namely, the clapboard polarizer 2 outputs circularly polarized signals to feed the bell mouth, the signals received by the bell mouth are fed into the clapboard polarizer 2, and one side of the feed square waveguide 1.1, which is far away from the antenna mouth surface, is provided with a flange for being connected with the clapboard polarizer 2; two mutually perpendicular partition plates are arranged in the horn waveguide 1.2, the long horn antenna 1 is changed from a radiator into four radiators, and the two partition plates are crossed, so that single-mode transmission is guaranteed, the bandwidth is expanded, and the gain is improved; the radiation opening surface 1.3 is the horn opening of the long horn antenna 1, and the polytetrafluoroethylene medium is filled, so that the aperture field distribution is improved, and the aperture efficiency of the horn is improved.
The baffle polarizer 2 comprises a metal baffle 2.1, a transmitting port 2.2, a transmitting impedance converter 2.3, a receiving port 2.4 and a receiving impedance converter 2.5, the baffle polarizer 2 is a standard square waveguide and is a three-port network, namely 2 standard interface transmitting ports 2.2, 2.4 receiving ports and 1 open waveguide port, and the waveguide port is provided with a flange for connecting with the long horn antenna 1; the metal partition plate 2.1 is positioned in the middle of the partition plate polarizer 2, the partition plate polarizer 2 is divided into two rectangular waveguides, namely, a transmitting circular polarization forming area and a receiving circular polarization transmission area are formed, one surface far away from the transmitting port 2.2 and the receiving port 2.4 is a step surface, a TE10 mode signal input from the transmitting port 2.2 passes through the metal partition plate 2.1 to generate orthogonal TE10 and TE01 mode circular polarization signals, and a TE10 mode signal input from the open waveguide port of the partition plate polarizer 2 passes through the metal partition plate 2.1 to generate orthogonal TE10 and TE01 mode circular polarization signals; the transmitting port 2.2 and the receiving port 2.4 are standard SMA ports and are used for inputting or outputting radio frequency signals, and the requirements of isolation and axial ratio are realized by applying finite element analysis and optimizing the height and length of each section of step of the step surface; the transmission impedance converter 2.3 is in a step shape, and transmission impedance matching is realized by simulating, optimizing and adjusting the height and the length of the step; the receiving impedance converter 2.4 is in a step shape, and receiving impedance matching is realized by simulating, optimizing and adjusting the height and the length of the step.
The long horn antenna and the partition plate polarizer in the X-frequency-band low-grating-lobe circularly polarized antenna realize the circularly polarized antenna in a waveguide cascade mode, and the X-frequency-band low-grating-lobe circularly polarized antenna is simple in structure and low in loss.
The X-frequency-band low-grating-lobe circularly polarized antenna adopts the metal cross partition plate to partition the long horn antenna into four small horns, so that the horn aperture efficiency is improved, and the antenna unit gain is improved.
In addition to the above embodiments, the present invention also includes other embodiments, and all technical solutions formed by equivalent transformation or equivalent replacement should fall within the protection scope of the claims of the present invention.
Simulation verification:
drawing a structure diagram in the HFSS according to the design size, optimizing parameters according to the optimization conditions, and obtaining the final result as shown in figures 7-9, wherein the gain is about 13.9dB at 9.5GHz, the on-axis ratio in the same band is less than 1.0, and the 3D directional diagram can meet the requirement of spatial scanning coverage and has narrower zero bandwidth.
In addition to the above embodiments, the present invention also includes other embodiments, and all technical solutions formed by equivalent transformation or equivalent replacement should fall within the protection scope of the claims of the present invention.
Claims (5)
1. The utility model provides a low grating lobe circular polarization antenna of X frequency channel, it comprises interconnect's long horn antenna and baffle polarizer which characterized in that: the long horn antenna comprises a feed square waveguide, a horn waveguide and a radiation port surface which are sequentially connected, wherein the feed square waveguide is a standard waveguide and is used for realizing the coupling and conversion of a transmitting and receiving signal of the partition plate polarizer, one side of the feed square waveguide, which is far away from the antenna port surface, is provided with a flange and is used for being connected with the partition plate polarizer, the other side of the feed square waveguide is connected with a small caliber of the horn waveguide, and the radiation port surface is positioned at a large caliber of the horn waveguide and is used as a horn port of the long horn antenna; the baffle polarizer comprises a metal baffle, a transmitting port, a transmitting impedance converter, a receiving port and a receiving impedance converter, the baffle polarizer is a standard square waveguide, is a three-port network and is respectively a transmitting port, a receiving port and an open waveguide port, and the open waveguide port is provided with a flange and is connected with the long horn antenna; the utility model discloses a metal baffle plate, including baffle plate polarizer, metal baffle plate, transmission port and receiving port, metal baffle plate is located the intermediate position of baffle plate polarizer, divide into two rectangular waveguide with the baffle plate polarizer, forms transmission circular polarization formation district and receiving circular polarization transmission area promptly, transmission port and receiving port link to each other with transmission impedance converter, receiving impedance converter respectively, and are located the metal baffle plate both sides, the one side that transmission port and receiving port were kept away from to the metal baffle plate is the ladder face for mode circular polarization signal of quadrature is produced after the metal baffle plate to the mode signal of following the input of transmission port, produces the mode circular polarization signal of quadrature behind the metal baffle plate from the mode signal that the baffle plate polarizer opened waveguide.
2. The X-band low-grating lobe circularly polarized antenna of claim 1, wherein: two mutually perpendicular clapboards are arranged in the horn waveguide, so that the long horn antenna is changed into four radiators from one radiator, and the two clapboards are crossed.
3. The X-band low-grating lobe circularly polarized antenna of claim 1, wherein: the radiation port surface is filled with polytetrafluoroethylene medium, so that the aperture field distribution is improved, and the aperture efficiency of the horn is improved.
4. The X-band low-grating lobe circularly polarized antenna of claim 1, wherein: the transmitting port and the receiving port are standard SMA ports and are used for inputting or outputting radio frequency signals.
5. The X-band low-grating lobe circularly polarized antenna of claim 1, wherein: the transmitting impedance converter and the receiving impedance converter are in a step shape, and the transmitting impedance matching and the receiving impedance matching are realized by simulating, optimizing and adjusting the height and the length of the step.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921723468.8U CN210607636U (en) | 2019-10-15 | 2019-10-15 | X-frequency-band low-grating-lobe circularly polarized antenna |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921723468.8U CN210607636U (en) | 2019-10-15 | 2019-10-15 | X-frequency-band low-grating-lobe circularly polarized antenna |
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| CN210607636U true CN210607636U (en) | 2020-05-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201921723468.8U Expired - Fee Related CN210607636U (en) | 2019-10-15 | 2019-10-15 | X-frequency-band low-grating-lobe circularly polarized antenna |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110661103A (en) * | 2019-10-15 | 2020-01-07 | 中国人民解放军63686部队 | X-frequency-band low-grating-lobe circularly polarized antenna |
| CN112864598A (en) * | 2021-01-12 | 2021-05-28 | 北京邮电大学 | Circularly polarized antenna suitable for millimeter wave communication and communication equipment |
| CN115863995A (en) * | 2022-12-07 | 2023-03-28 | 深圳职业技术学院 | Broadband high-gain horn antenna |
-
2019
- 2019-10-15 CN CN201921723468.8U patent/CN210607636U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110661103A (en) * | 2019-10-15 | 2020-01-07 | 中国人民解放军63686部队 | X-frequency-band low-grating-lobe circularly polarized antenna |
| CN112864598A (en) * | 2021-01-12 | 2021-05-28 | 北京邮电大学 | Circularly polarized antenna suitable for millimeter wave communication and communication equipment |
| CN115863995A (en) * | 2022-12-07 | 2023-03-28 | 深圳职业技术学院 | Broadband high-gain horn antenna |
| CN115863995B (en) * | 2022-12-07 | 2023-06-27 | 深圳职业技术学院 | Broadband high-gain horn antenna |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200522 Termination date: 20201015 |