Multi-Channel SIW Filtering Crossover With Flexibly Specified Frequencies and Bandwidths

Substrate-integrated waveguide (SIW) multi-channel filtering crossover is presented with multiple over-mode dual-mode substrate-integrated rectangular cavities (SIRCs) coupled with each other. Orthogonal TE102 and TE201 modes in the dual-mode SIRCs are exploited first to realize cross transmissions and acceptable isolations between the multiple intersecting channels, frequencies and bandwidths of the channels can be specified flexibly by controlling the resonant frequencies and mutual couplings of the SIRCs. An example with 2 + 3 filtering channels centered at 12 and 13.5 GHz with the same channel bandwidths is synthesized, designed, fabricated, and tested for demonstration.