Mode Transducer Utilizing Asymmetric Waveguide Narrow-Wall Coupling

A computer aided design of a rectangular waveguide H20 - H10 - mode transducer is described which consists of an asymmetric narrow-wall coupler with branch lines of unequal length and width. The theory is based on the method of field expansion into orthogonal eigenmodes which includes higher order mode excitation and coupling effects at the discontinuities in the computations. Numerical optimization of the design parameters achieves a crosstalk attenuation of over 50 dB.