Design of high-power millimeter wave corrugated circular waveguide mode converter

Based on the general coupled wave equations in corrugated circular waveguide with trapered radius, this paper presents the numerical optimization method Runge-Kutta to get the design parameters of 3 mm TE03-TE02 and TE02-TE01 high efficiency mode converter. The optimized structure and computational results are obtained by optimized programme. Simulation results of the structure by CST microwave studio are in excellent agreement with the numerical computed values. The center frequency of TE03-TE02 and TE02-TE01 mode converter is 94 GHz, and the mode converters designed in this way have high conversion efficiencies above 98.5% with their absolute bandwidth exceeding 3.5 GHz and 7.0 GHz respectively.