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In this letter, a pin‐loaded triple‐mode square patch resonator is proposed for bandpass filter (BPF) design. By loading short‐circuited pins underneath the patch, the patch resonator not only enables DC‐blocking, but also brings out one additional resonant mode, thus a triple‐mode patch resonator can be formed up under operation with a pair of degenerate modes. According to the field distributions, these three resonant modes can be tuned by virtue of loaded slots and pins, while these two degenerate modes can be properly split by offset‐positioning the two sets of pins. In final, a pin‐loaded triple‐mode patch BPF is designed, fabricated and measured to validate the predicted results. [ABSTRACT FROM AUTHOR]

ABSTRACT A sharp-rejection dual-band bandstop filter using transversal signal-interaction with three paths, consisting of a transmission line path and two coupled paths, is proposed. By tuning the coupling coefficient and odd-mode impedance of the coupled lines, the center frequency ratio and bandwidth can be controlled, respectively, and the transmission line impedance is used to allocate the transmission poles to sharp the attenuation rate. A compact dual-band bandstop filter prototype is designed and fabricated. The simulation and measurement results agree well. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:657-660, 2015 [ABSTRACT FROM AUTHOR]