Broadband and circularly polarized microstrip antenna
A microstrip antenna and circular polarization technology, which is applied in the direction of resonant antenna, antenna grounding switch structure connection, radiation element structure, etc., can solve the problems of phase center instability, limited application range, narrow bandwidth, etc., and achieve phase center stability , The effect of wide antenna axial ratio bandwidth
Pending Publication Date: 2019-05-24
CHENGDU UNIV OF INFORMATION TECH
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Problems solved by technology
The current broadband circularly polarized microstrip antenna has a narrow bandwidth and cannot cover multiple frequency bands at the same time, which limits the application range and the phase center is unstable.
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Embodiment 2
[0083] Embodiment two: if Figure 6 , different from Embodiment 1, there are five linearly polarized microstrip antenna units 2 in this embodiment, which are arranged to form a regular pentagon in plan view, and the broadband phase-shifting network 3 in this embodiment has four sub-units. Net 31:
[0084] The input terminal 310 of the first subnetwork 31a is the signal terminal 10, one output terminal 311 is connected to the feeding metal strip 8 of the first linearly polarized microstrip antenna unit 2a, and the other output terminal 311 is the input terminal of the second subnetwork 31b 310;
[0085] One output end 311 of the second subnetwork 31b is the input end 310 of the third subnetwork 31c, and the other output end 311 is the input end 310 of the fourth subnetwork 31d;
[0086] One output end 311 of the third subnetwork 31c is connected to the second linearly polarized microstrip antenna unit 2b, and the other output end 311 is connected to the third linearly polariz...
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The invention relates to the field of wireless communication, and particularly relates to a broadband and circularly polarized microstrip antenna. The broadband and circularly polarized microstrip antenna comprises a metal bottom plate, linearly polarized microstrip antenna units and a broadband phase-shifting network. The linearly polarized microstrip antenna units are vertically arranged on themetal bottom plate and are annularly arranged in a closed manner. The broadband phase-shifting network is arranged on the metal bottom plate and is used for feeding power to the ports of the linearlypolarized microstrip antenna units. The broadband phase-shifting network can realize the broadband fixed phase shifting function. By adopting the four-unit sequential feeding, the phase center of theantenna can be stable. After the broadband phase-shifting network is combined with a four-unit array, a wide antenna axial ratio bandwidth can be realized.
Description
technical field [0001] The invention relates to the field of wireless communication, in particular to a broadband circularly polarized microstrip antenna. Background technique [0002] The broadband antenna can make the antenna work in a wider frequency band, and can be used in a wider range of occasions. It can receive and send signals in multiple frequency bands at the same time, which improves the space utilization and increases the capacity of the channel. Circularly polarized antennas have advantages due to their circularly polarized properties: (1) incoming waves of any polarization can be received by circularly polarized antennas, on the contrary, circularly polarized waves radiated by circularly polarized antennas can be received by any polarized Antenna acceptance; (2) Orthogonality of circularly polarized antenna; (3) Symmetrical target will change the direction of circularly polarized wave. Therefore, radars using circularly polarized waves have the ability to re...
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IPC IPC(8): H01Q1/36H01Q1/38H01Q1/50H01Q9/04
Inventor 李荣强李波杜国宏
Owner CHENGDU UNIV OF INFORMATION TECH