Round polarization short rear radiation antenna with spiral feedback source

Abstract

The invention discloses a circular polarization short backfire antenna with spiral feed source with higher broadband characteristic and smaller using volume from wireless communication antenna field, which comprises a master reflector (1), a sub-reflector (2), a feed source (3), as well as an assisting support (2); the feed source (3) comprises a helical antenna (31) and a feed point allocation device (32); the helical antenna (31) is coiled on the assisting support (2), one end is fixed with the assisting support (2), and the other end is connected with a signal output cable (5) through the feed point allocation device (32). Through adopting the helical antenna as the feed source of backfire antenna, the invention realizes the broadband and circular polarization of the antenna, meanwhile, the invention uses the helical wire to support and replace the special shaft, and to be connected with main parts of the antenna, thereby simplifying the antenna structure, reducing complexity of antenna processing technology, so as to benefit the mass production of the antenna.

Description

Technical field [0001] The present invention relates to wireless communication antenna technology, in particular to the technical field of circularly polarized antennas with high requirements for broadband characteristics and small volume. Background technique [0002] The short backfire antenna is used in the occasions where the antenna volume is required to be small, and it is generally composed of a main reflector, a sub reflector, a feed source and an auxiliary support. Its working principle is that electric waves are reflected back and forth between the main and auxiliary reflectors, and part of the energy is radiated from the auxiliary reflector for each reflection. The existing short backfire antennas mainly use symmetrical elements, crossed dipoles and waveguides as feed sources. [0003] When using symmetrical elements and crossed dipoles as the feed source of the antenna, the resonance characteristics of the symmetrical elements and dipoles themselves determine that the ...

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Problems solved by technology

[0003] When the symmetrical element and crossed dipole are used as the feed source of the antenna, the impedance bandwidth of the antenna is determined to be narrow due to the resonance characteristics of the symmetrical element and the dipole itself. When the waveguide is used as the feed source, the structure of the antenna is relatively complicated. , S and C band feed point waveguide size is larger

In the patent of a modified backfiring antenna with the patent number ZL92203292.0, the working bandwidth of the antenna is increased by adding a corrugated ring around the main reflector, but the processing of the corrugated ring is relatively complicated, which affects the manufacturability of the antenna ; In addition, in this patent, the corrugated ring and the surrounding edge and the surrounding edge and the conical reflector are connected by welding, which affects the consistency of the antenna performance

In patent No. ZL01250096.8, a wide-band high-gain circularly polarized antenna patent, the helical radiator, the back-firing cavity and the converter are connected through a special shaft, and the antenna structure is complicated; in addition, the back-firing cavity is composed of a cavity Composed of built-in load ring, the production cost of the antenna is relatively high

[0004] In the 2002 Vol.23 No.2 "Guidance and Fuze" article "A Novel Design of a Waveguide-fed Short Backfire Antenna", Qiu Jinghui from Harbin Institute of Technology and others proposed to carry out the sub-reflector of the short backfire antenna The improvement of conicity increases the gain of the antenna, but the volume of the antenna is relatively large

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