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
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[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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