Transformers With Incorporated Filtering Capabilities Exploiting Signal-Interference Principles (1044)

Double-functionality microwave planar circuits hybridizing filtering and impedance transformation capabilities are reported. They are based on signal-interference transversal filtering sections whose design equations are generalized to synthesize the filtering functionality between any pair of real port impedances. For validation, two double-function microstrip prototypes for dual-band and ultra-wideband single-band filtering specifications featuring transformation ratios of 2:1 are developed.