Novel broadband coaxial waveguide orthomode coupler based on turnstile structure

A technology of orthogonal mode coupler and coaxial waveguide, which is applied in the direction of waveguide devices, electrical components, connecting devices, etc., can solve the problem of not being able to realize ultra-wideband operating characteristics, and the lack of design schemes for coaxial waveguide orthogonal mode couplers and other issues to achieve the effect of compact structure, high reflection loss, and high port isolation

Inactive Publication Date: 2015-09-23
常州吉赫射频电子技术有限公司
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  • Application Information

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Problems solved by technology

There are few design schemes for coaxial waveguide orthogonal mode couplers, and there are almost no examples that can achieve ultra-wideband operating characteristics

Method used

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  • Novel broadband coaxial waveguide orthomode coupler based on turnstile structure
  • Novel broadband coaxial waveguide orthomode coupler based on turnstile structure
  • Novel broadband coaxial waveguide orthomode coupler based on turnstile structure

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specific Embodiment approach 1

[0030] Orthogonal mode couplers are usually placed after the common feed antenna for transmitting and receiving. For the receive mode, the feed antenna receives any polarized signal and then transmits it in the feed waveguide. The orthogonal mode coupler connected after the feed waveguide can polarize the signal in the feed waveguide to obtain two orthogonal signals; for the transmission mode, a certain frequency can be added to the two input / output ports 9 The excitation corresponds to orthogonally polarized radiation, and the two signals enter the common channel at the same time, and then enter the feed waveguide and feed antenna, and radiate to free space. Different excitation methods correspond to different antenna radiation polarization characteristics.

specific Embodiment 2

[0031] The main test index of the quadrature mode coupler is the reflection coefficient at the 2 output / input ports 9 and the isolation between them. During the test, the two output / input ports 9 need to be connected to the two test ports of the vector network analyzer respectively, and the common coaxial waveguide 4-port connection can cover the broadband matching load of the Ku frequency band, so that the test can be performed, such as Figure 5 and Figure 6 As shown, the structure is compact and easy to integrate into the feed antenna system.

[0032] Compared with the prior art, the broadband coaxial waveguide orthogonal mode coupler of the present invention can effectively reduce the excitation of high-order modes in the coaxial waveguide, and by adopting a turnstile structure, high Reflection loss, high port isolation characteristics. After simulation optimization testing and other links, the performance results of the coupler are as follows: In the range of 12.3-16.2...

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Abstract

The invention relates to a novel broadband coaxial waveguide orthomode coupler based on a turnstile structure. The novel broadband coaxial waveguide orthomode coupler comprises the turnstile structure, two power synthesizers or distributors or two impedance transformers, wherein the turnstile structure comprises a coaxial waveguide, an impedance matching structure and a coupling rectangular waveguide; each of the power synthesizers or distributors comprises a bent waveguide and a three-port cavity structure; and the impedance transformers are fifth-order rectangular waveguide step gradual-changing structures. According to the novel broadband coaxial waveguide orthomode coupler, the orthogonalp polar signal coupling problem in a coaxial feed waveguide in a multi-frequency satellite communication antenna system, and the broadband working characteristic problem of the coaxial waveguide orthomode coupler are solved, and the orthogonal signal coupling function requirements within dual receiving and sending frequency bands of a Ku-frequency-band satellite communication feed source antenna can be satisfied.

Description

technical field [0001] The invention relates to a novel broadband coaxial waveguide orthogonal mode coupler based on a turnstile structure. Background technique [0002] In the satellite communication system, the multi-frequency antenna can improve the communication capacity and reduce the construction cost of the ground station, so it is widely used. For the design of satellite communication feed antenna, when the multi-polarization working mode is required, it is generally necessary to connect an orthogonal mode coupler after the feed horn. In the design process of some feed antennas, coaxial waveguide feeding structure will be adopted due to consideration of multi-frequency operation, transceiver isolation and other index requirements; at this time, the common port of the orthogonal mode coupler should also be a coaxial waveguide port. There are few design schemes for coaxial waveguide orthogonal mode couplers, and there are almost no examples that can achieve ultra-wide...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01P5/12
Inventor 邱景辉张鹏宇
Owner 常州吉赫射频电子技术有限公司
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