CN216773512U - Broadband wide-angle scanning circularly polarized microstrip phased-array antenna - Google Patents
Broadband wide-angle scanning circularly polarized microstrip phased-array antenna Download PDFInfo
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- CN216773512U CN216773512U CN202123177333.6U CN202123177333U CN216773512U CN 216773512 U CN216773512 U CN 216773512U CN 202123177333 U CN202123177333 U CN 202123177333U CN 216773512 U CN216773512 U CN 216773512U
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Abstract
The utility model belongs to the technical field of antennas, and particularly relates to a broadband wide-angle scanning circularly polarized microstrip phased array antenna. The antenna of the present invention comprises three parts: the upper layer copper foil metal patch, the middle microwave dielectric layer and the lower layer metal floor are sequentially arranged; the metal patch is circular, and an asymmetric U-shaped groove is formed in the metal patch; the coaxial feed probe is inserted into the circular holes in the dielectric plate and the floor and is directly connected with the upper metal patch to excite the antenna. The introduction of the asymmetric U-shaped groove can effectively adjust the characteristics of TM10, TM01 and slot modes of the patch antenna, and meanwhile, the length of an electric current path can be increased, and the miniaturization is facilitated. When three orthogonal modes are excited simultaneously, the circularly polarized microstrip phased array antenna with broadband characteristics can be realized. And periodic metalized through holes are formed in the dielectric layer, the diameter of each through hole is 0.3 mm, and the distance between the through holes is 0.5 mm, so that the surface wave propagation is inhibited, and the wide-angle scanning of the phased array is realized.
Description
Technical Field
The utility model belongs to the technical field of antennas, and particularly relates to a broadband wide-angle scanning circularly polarized microstrip phased array antenna.
Background
With the development and wide application of technologies such as satellite communication, remote sensing and remote measuring, radar and the like, the circularly polarized phased array antenna is applied more and more. Compared with a linear polarization antenna, the circularly polarized antenna can eliminate polarization distortion loss caused by ionosphere Faraday rotation effect, and can adapt to receiving of signals on a carrier which is violently swung or rolled. The microstrip antenna has the advantages of low profile, easy conformal with a carrier, easy realization of circular polarization and the like, thereby being widely applied. However, microstrip antennas are high Q resonant antennas and the narrow bandwidth of operation limits further applications. Wireless communication systems also place increasing demands on circularly polarized phased array antennas, especially for wide frequency and wide angle scanning. Therefore, how to improve the bandwidth and the wide-angle scanning capability of the circularly polarized patch antenna becomes one of the problems to be solved urgently in the circularly polarized phased array antenna technology.
Disclosure of Invention
The utility model aims to provide a broadband wide-angle scanning circularly polarized microstrip phased array antenna, which can improve the bandwidth and wide-angle scanning capability of a circularly polarized patch antenna.
The circularly polarized microstrip phased array antenna with wide-band and wide-angle scanning provided by the utility model forms two axial ratio extreme points by using three orthogonal modes of the antenna under the condition of not greatly increasing the volume of the antenna or using a complex feed structure, thereby effectively expanding the bandwidth of a patch antenna. And in the peripheral area of the metal patch unit, periodic metalized through holes are formed in the dielectric layer and are used for inhibiting surface wave propagation and realizing the wide-angle scanning capability of the phased array.
The circularly polarized microstrip phased array antenna with wide-band and wide-angle scanning provided by the utility model is shown in figure 1; the device consists of the following three parts:
the first part is a two-dimensional array with an upper layer composed of 64 unit metal patches, a printed copper foil metal layer is adopted, and the thickness is 18-35 microns; an asymmetric U-shaped groove is formed in the unit metal patch; in the two-dimensional array, a 2 multiplied by 2 two-dimensional subunit at the upper left corner is taken as a basis, wherein U-shaped grooves in the patch units are sequentially rotated by 90 degrees according to respective central points; then, extending the 2 x 2 two-dimensional subunits at the upper left corner to the right and downward respectively for 4 periods to obtain a two-dimensional array consisting of 64 unit metal patches;
the asymmetric U-shaped groove is used for adjusting the characteristics of TM10, TM01 and a slot mode of the patch antenna, and meanwhile, the length of a current path can be increased by slotting, so that miniaturization is facilitated; the three modes are excited simultaneously, and broadband circularly polarized electromagnetic waves can be radiated.
The second part is an intermediate microwave dielectric layer which is a carrier of the metal patch and is used for supporting the metal patch; the thickness of the dielectric layer is 3-4 mm; a cylindrical hole with the diameter of 1-1.3 mm is formed at the feeding position; and in the peripheral area of the metal patch unit, periodic metalized through holes are formed in the dielectric layer, the diameter of each through hole is 0.3 mm, and the distance between every two through holes is 0.5 mm, so that the surface wave propagation is inhibited, and the wide-angle scanning of the phased array is realized.
The third part is a lower layer metal floor, a cylindrical hole with the diameter of 2.5-4 mm is formed in the position, corresponding to the cylindrical hole in the dielectric layer, on the floor and used for inserting a feed probe, and the floor is square as a whole. The floor plays a role in reflecting electromagnetic waves, and the antenna gain is improved.
The coaxial feed probe is inserted into corresponding cylindrical holes in the dielectric plate and the metal floor and is directly connected with the upper-layer metal patch to excite the phased array antenna.
In the utility model, the shape of the metal patch unit is square, circular or rectangular, and the specific shape is selected according to the practical use environment constraint of the antenna. Preferably square.
In the utility model, the asymmetric U-shaped groove in the metal sheet can also be square or arc, and the specific shape is selected according to the practical antenna use environment constraint.
In the utility model, the line width of the U-shaped groove is 1-2 mm, the depth is 18-35 microns, the length and the distance of the U-shaped groove are both smaller than the size of the unit, and the specific size is determined according to the impedance and the axial ratio bandwidth required by the actual antenna.
The circularly polarized microstrip phased array antenna has a simple structure and a low section, and can realize good circularly polarized beam scanning capability within a bandwidth of 10-13 GH and within plus and minus 65 degrees.
Drawings
Fig. 1 is an oblique view of a broadband wide angle scanning circularly polarized microstrip phased array antenna.
Fig. 2 is a simulation diagram of the variation of the active standing wave of the central unit of the broadband wide-angle scanning circularly polarized microstrip phased array antenna with the scanning angle.
FIG. 3 is a simulated beam scanning pattern of the broadband wide-angle scanning circularly polarized microstrip phased array antenna at 11.5 GHz.
FIG. 4 is a simulation diagram of the axial ratio of the broadband wide-angle scanning circularly polarized microstrip phased array antenna at 11.5 GHz changing with the scanning angle.
Reference numbers in the figures: the metal floor board comprises a dielectric board, a circular patch, a microwave dielectric board, a lower-layer metal floor board, a unit patch, a coaxial connector inner conductor, a microwave dielectric board and a circular patch, wherein the dielectric board is 1 which is a periodic metalized through hole in the dielectric board, the circular patch is 2 which is a U-shaped seam, the unit patch is 3 which is a unit patch, the coaxial connector inner conductor is 4 which is a microwave dielectric board, and the lower-layer metal floor board is 6 which is a lower-layer metal floor board.
Detailed Description
The antenna adopts a structure of a metal-medium-metal sandwich, an upper layer metal copper foil patch 3 with the thickness of 18-35 microns is printed on a microwave dielectric plate 5 by using a PCB process, a U-shaped groove 2 is formed in the patch 3, the line width of the groove is preferably 1-2 mm wide, the depth is preferably 18-35 microns deep, the length and the width of the U-shaped groove are both smaller than the diameter of a circular patch, and the specific size is determined according to the impedance and the axial ratio bandwidth required by the actual antenna; then, a thin cylindrical hole with a diameter of 1.3 mm is formed at the feeding position of the dielectric plate. Then, a metal floor 6 is attached below the dielectric sheet 5. Finally, a coaxial probe is inserted into the medium and is connected with the upper metal patch 1.
Fig. 1 is an oblique view of a broadband wide angle scanning circularly polarized microstrip phased array antenna.
Fig. 2 is a simulation diagram of the variation of the active standing wave of the central unit of the broadband wide-angle scanning circularly polarized microstrip phased array antenna with the scanning angle.
FIG. 3 is a simulated beam scanning pattern of the broadband wide-angle scanning circularly polarized microstrip phased array antenna at 11.5 GHz.
FIG. 4 is a simulation diagram of the axial ratio of the broadband wide-angle scanning circularly polarized microstrip phased-array antenna at 11.5 GHz changing with the scanning angle.
Claims (4)
1. The circularly polarized microstrip phased array antenna with wide-band and wide-angle scanning is characterized by comprising the following three parts:
the upper layer is a two-dimensional array consisting of 64 unit metal patches, a printed copper foil metal layer is adopted, and the thickness is 18-35 microns; asymmetric U-shaped grooves for adjusting the characteristics of TM10 and TM01 of the patch antenna and the slot mode and increasing the length of a current path are formed in the unit metal patches; the 64 unit metal patches are arranged in an 8 × 8 two-dimensional array: wherein, 4 unit metal patches are arranged into 2 × 2 two-dimensional subunits, and an 8 × 8 two-dimensional array is formed by arranging 4 × 4 two-dimensional subunits; the opening directions of the U-shaped grooves in the 4 unit metal patches in the two-dimensional subunit are sequentially 90 degrees apart in the clockwise direction;
the middle part is a microwave dielectric layer which is a carrier of the metal patch and is used for supporting the metal patch; the thickness of the dielectric layer is 3-4 mm; a cylindrical hole with the diameter of 1-1.3 mm is formed at the feeding position; in the peripheral area of the metal patch unit, periodic metalized through holes are formed in the dielectric layer, the diameter of each through hole is 0.3 mm, the distance between every two through holes is 0.5 mm, and the through holes are used for inhibiting surface wave propagation and realizing wide-angle scanning of the phased array;
thirdly, the lower layer is a metal floor, a cylindrical hole with the diameter of 2.5-4 mm is formed in the position, corresponding to the cylindrical hole in the dielectric layer, of the floor, the cylindrical hole is used for inserting a feed probe, and the floor is integrally square; the floor plays a role in reflecting electromagnetic waves, and the antenna gain is improved;
the coaxial feed probe is inserted into corresponding cylindrical holes in the dielectric plate and the metal floor and is directly connected with the upper-layer metal patch to excite the phased array antenna.
2. The wideband wide angle scanning circularly polarized microstrip phased array antenna according to claim 1 wherein the metal patch elements are square, circular or rectangular in shape.
3. The wideband wide angle scanning circularly polarized microstrip phased array antenna according to claim 1 wherein the asymmetric U-shaped groove inside the metal patch element is square or arc shaped.
4. The circularly polarized microstrip phased array antenna for wide-band wide-angle scanning according to claim 1, wherein the U-shaped slot has a line width of 1-2 mm and a depth of 18-35 μm, and the length and pitch of the U-shaped slot are smaller than the size of the element.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123177333.6U CN216773512U (en) | 2021-12-16 | 2021-12-16 | Broadband wide-angle scanning circularly polarized microstrip phased-array antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123177333.6U CN216773512U (en) | 2021-12-16 | 2021-12-16 | Broadband wide-angle scanning circularly polarized microstrip phased-array antenna |
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| Publication Number | Publication Date |
|---|---|
| CN216773512U true CN216773512U (en) | 2022-06-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123177333.6U Active CN216773512U (en) | 2021-12-16 | 2021-12-16 | Broadband wide-angle scanning circularly polarized microstrip phased-array antenna |
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| CN (1) | CN216773512U (en) |
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2021
- 2021-12-16 CN CN202123177333.6U patent/CN216773512U/en active Active
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