A Waveguide Multiplexer with Dual-Mode Filters for Satellite Use

The paper treats the synthesis, optimization and practical realization of a 4 GHz waveguide multiplexer composed of a WR229 straight waveguide manifold with one end shorted and dual TE111-mode Chebyshev bandpass filters arranged at intervals along the broad wall sides. The optimization process includes the filter spacings and several initial elements of each distributed filter equivalent circuit. The results of measurements performed on the breadboard model of a 4-channel multiplexer with 4-pole dual-mode filters are in good agreement with the calculated responses.