Dual-arm coupling quadrature mode coupler with high cross polarization discrimination

Abstract

A dual-arm coupling quadrature mode coupler with high cross polarization discrimination comprises a chamfer matching mode T, a public waveguide, a pubic waveguide transformer, two coupled arms, a waveguide receiving transformer, a low-pass filter, a waveguide transmitting transformer and absorbing load. Excitation of high order modes in the public waveguide is reduced greatly by utilizing symmetrical structures of two coupled arms, and dual-arm feed is realized on the quadrature mode coupler by adopting the chamfer matching mode T, thereby effectively guaranteeing signal division at a coupling port of the quadrature mode coupler, enabling the quadrature mode coupler to achieve excellent uniform amplitude characteristics and fine port isolation, reducing discontinuity, further reducing excitation to the high order modes as few as possible, obviously increasing the cross polarization discrimination, and then successfully resolving problems that a satellite communication antenna achieveshigh cross polarization discrimination at a separation band. In addition, the dual-arm coupling quadrature mode coupler is simple in implementing mode, low in processing cost and high in cost performance ratio and can be widely applied to various frequency ranges.

Description

Technical field [0001] The present invention involves a high -polarized isolation quarantine coupled orthodontic mold coupler, which belongs to the field of satellite communication. Background technique [0002] In the satellite communication, the polarization isolation of the communication antenna is very high. With the rapid development of the satellite communication industry, a pair of communication antennas is applied more and more in the separation band.Narrow belt (usually less width less than 10 %) is relatively easy to obtain high polarization isolation technology, and it is very difficult to obtain high polarization isolation in the separation frequency band (frequency span greater than 1.4: 1)The cut -off frequency of the high -level model is lower than the upper frequency zone, and the high -end model can spread, especially the incentives of high -end models in the branch area. This high -end model reduces the polarization isolation of the orthogonal mode coupling.Ther...

AI Technical Summary

Problems solved by technology

[0004] The technical problem solved by the present invention is to overcome the deficiencies of the prior art and provide a dual-arm coupled quadrature-mode coupler with high polarization isolation, which can obtain excellent equal-amplitude characteristics and comparative High port isolation, successfully solved the problem of satellite communication antennas obtaining high polarization isolation in separate frequency bands

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