Design of a Rectangular-circular Mode Converter for Waveguide
In the large-diameter reflector antenna and feederline system of air traffic control radar,the mode conversion process between rectangular waveguide and circular waveguide has always been unavoidable.However,the traditional gradient waveguide rectangular-circular mode convert-er is too long and not compact enough,which greatly restricts the volume of the radar feed source.This paper uses the microwave radio frequency(RF)simulation software ANSYS HFSS to design a short and compact waveguide rectangular-circular mode converter.By simply loading two steps of transformation between the rectangular waveguide and the circular waveguide transition sec-tions,the transformation from rectangular waveguide TE10 mode to circular waveguide TE11 mode can be achieved.And later physical processing testing verifies that the electrical performance is good,the voltage standing wave ratio(VSWR)of the waveguide port is less than 1.05,and the in-sertion loss is less than 0.01 dB,which effectively verifies the feasibility of this design.The struc-ture is simple,compact,easy to process,and has good electrical performance,so the design has cer-tain research value in the feed line system of air traffic control radar.
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