Design of enhanced microwave multiplexing networks with H-plane T-junctions

The enhanced type of multiplexer has been proven to be able to significantly improve multiplexer performances by forming extra pole in the passband of each channel using the existing manifold. For completeness of the design methodology, the design of the enhanced type of multiplexers with H-plane T-junctions is investigated in this paper. Design equations are given. By changing the distance between the channel filters and the distance between manifold waveguide and channel filter, the resonances and the magnitude of coupling can be readily controlled to satisfy design requirement. Examples are used to demonstrate the feasibility and effectiveness of the design using H-plane T-junctions.