Four-Way Filtering Crossover Based on Quadruple-Mode Cavity Resonator

A novel waveguide four-channel filter, namely four-way filtering crossover, is presented in this paper. A quadruple-mode cavity resonator, integrated with two fundamental modes TE
011
, TE
101
and two high-order modes TM210, TM120, is adopted to dominate each channel of the proposed four-way filtering crossover, respectively. The proposed quadruple modes are excited in the first order, simultaneously, and transmitted through to the last order with specified external quality factors (Qe) and coupling coefficient (K). By this method, the circuit volume is significantly reduced. A 3
^rd
-order four-way filtering crossover prototype is manufactured and tested. The measured results match well with the simulated ones to verify the proposed design methodology.