Millimeter-wave Ka-band H-plane diplexers and multiplexers

Millimeter-wave H-plane diplexers/multiplexers are designed using modified H-plane waveguide T-junctions and modified inductive window bandpass filter s. Modeling of the diplexers/multiplexers are performed using the full-wave mode-matching method to obtain the generalized scattering matrices of the building blocks and by the cascading procedure to provide the overall frequ ency response. A complete systematic optimization procedure leads to the de sired diplexer/multiplexer design. The validity of employing the modified H -plane T-junctions in the diplexer/multiplexer configurations are demonstra ted by the design examples. A millimeter-wave Ka upper band diplexer based on the simulated results was built and tested. Without any tuning, excellen t experimental results are obtained, which verified the full-wave mode-matc hing-based precise design.