Abstract-In this paper, a new systematic technique to design manifold-coupled multiplexers in waveguide technology is proposed. The new technique uses generalized low-order electromagnetic (EM) distributed models, which constitute a half-way point between the fast but imprecise analytical models, and the more accurate but costly full-wave EM models. The method can be applied to contiguous and non-contiguous channel multiplexers, in both E-plane or H-plane configurations. The paper covers the complete design procedure for manifold multiplexers, starting from the required specifications and finishing with the physical dimensions. After explaining the general design technique for multiplexers with channel filters based on transmissionline resonators, the method is specialized for the design of classic multiplexers with circular-waveguide dual-mode filters. As a further application example, the same methodology is also used for the design of a non-conventional tuning-less wideband multiplexer with a new type of rectangular waveguide filters. The paper is concluded with a comparison between simulation and measurements for the wideband multiplexer. Excellent agreement between measurements and simulations are demonstrated thereby validating the complete design procedure.
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