All‐resonator‐based waveguide diplexer with cross‐couplings

This is the authors' abstract. We don't add key points for this paper.

An investigation into new diplexer topologies, based on all‐resonator structures with cross‐couplings between common resonators (shared by both channels) and branch resonators is reported. This all‐resonator structure eliminates the need for separate frequency distribution networks and uses resonators to achieve this functionality. For diplexers based on such all‐resonator structures, cross‐couplings can be added between the common resonators and branch resonators to achieve some desired specification (e.g. improved isolation). Two diplexer topologies with such cross‐couplings are presented. The first topology is implemented at the X‐band using waveguide technology. Excellent measurement results verified the proposed topology as well as the design procedure.