Suppression of spurious responses in microstrip half‐wavelength filters combining stagger tuning and resistive attenuation

Abstract

ABSTRACTStagger tuning and resistive attenuation are combined to attenuate harmonic responses of microstrip filters with half‐wavelength resonators, extending the technique previously used for quarter‐wave resonators. In a measured filter with 0.93 GHz center frequency and 22% bandwidth, the worst spurious peak between 1.3 and 2.7 GHz is about 10 dB better than with stagger tuning alone, while the next two peaks at 2.75 and 3 GHz are suppressed by a further 5 dB. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:1955–1957, 2016