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

An orthogonal mode coupler and polarization isolation technology, which is applied in the field of satellite communication to achieve the effects of low processing cost, wide application prospects, and improved polarization isolation.

Active Publication Date: 2010-04-14
XIAN INSTITUE OF SPACE RADIO TECH
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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 obtai

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

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[0014] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments:

[0015] The quadrature mode coupler is a four-port device electrically. The common port is connected to the feeding horn, providing 2 electrical ports, which are respectively assigned to 2 independent quadrature modes. The remaining 2 ports are transceiver ports, which only transmit their respective Archetype. The quadrature mode coupler discriminates the independent signals of 2 quadrature primary modes on the common port and feeds them to the primary mode of a single signal port, matching all ports and having high polarization discrimination between the 2 signals. The excitation of high-order modes in the branch region of the common waveguide has an adverse effect on isolation and matching, and ultimately affects the radiation pattern of the antenna. Selecting an appropriate common port size and using the symmetrical branch structure...

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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 achieves high 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 invention relates to a double-arm coupled orthogonal mode coupler with high polarization isolation, which belongs to the field of satellite communication. Background technique [0002] In satellite communication, the polarization isolation of communication antenna is very high. With the rapid development of satellite communication, a pair of communication antenna is used more and more in separate frequency bands. Orthogonal mode coupler of satellite communication antenna is used in It is relatively easy to obtain high polarization isolation technology in narrowband (usually bandwidth less than 10%), but it is very difficult to obtain high polarization isolation in separated frequency band (frequency span greater than 1.4:1), because the orthogonal mode coupler works in the separated frequency band , the cut-off frequency of the high-order mode is lower than the upper frequency band, and the high-order mode can propagate, especially the excitation o...

Claims

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Application Information

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IPC IPC(8): H01P5/20
Inventor 崔兆云杨慧杰史莉莉冯小星王五兔
Owner XIAN INSTITUE OF SPACE RADIO TECH
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