Broadband eight-element dual circular polarization and beamforming network and design method

Abstract

The invention discloses a broadband eight-element dual circular polarization and beamforming network and a design method, and relates to the technical field of single-pulse antennas. The broadband eight-element dual circular polarization and beamforming network comprises two 3dB branch line couplers, six Wilkinson power dividers, two 45-degree phase shift lines, two 90-degree phase shift lines, and five 180-degree phase shift lines; The beamforming network designed by the invention, in the frequency band of 8 GHz to 12.4 GHz, has a port standing wave ratio less than 1.82, an output port amplitude difference less than 1.8dB, a port isolation greater than 15dB, and a phase unbalance within + / -7 degree. The network has good amplitude and phase characteristics, and satisfies the requirements of the dual circular polarization and beam generated by an eight-element antenna array.

Description

technical field [0001] The invention relates to the technical field of monopulse antennas, in particular to a broadband eight-element dual-circular polarization and beam forming network and a design method. Background technique [0002] In the modern reconnaissance system, passive reconnaissance is unknown to the frequency and polarization of incoming waves, so it is necessary to use ultra-wideband dual circularly polarized antennas for reconnaissance. The antenna is generally in the form of a parabola, combined with an ultra-wideband feed and a dual circularly polarized beamforming network to form the entire antenna feeder system. In order to track after signal detection, it is necessary to adopt the monopulse and difference beam system. The monopulse antenna system is a key component of the monopulse radar system, and the beamforming network determines whether the monopulse antenna array can realize the sum and difference function. Contents of the invention [0003] Ai...

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Problems solved by technology

[0003] Aiming at the problems of interlaced wiring and complex topological structure in the above network design, the present invention provides a broadband eight-element dual circular polarization and beamforming network and a design method, and the designed beamforming network operates at 8GHz-12.4GHz In the frequency band, the VSWR of the port is less than 1.82, the amplitude difference of the output port is less than 1.8dB, the isolation of the port is greater than 15dB, and the phase imbalance is within ±7°

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