Reduced-size wideband microstrip bandpass filter with low loss and high selectivity

Abstract

A reduced-size low-loss high-selectivity wideband microstrip bandpass filter is proposed using three lambda(g)/4 short-circuited stubs and folded lambda g/2 connecting lines between them. The filter has 2n - 1 poles within the passband, whereas it consists of only n resonators. The 3-dB bandwidth of the filter is about 92% at 2.1 GHz. The insertion loss is around 0.8 dB within the passband. The filter is verified by both simulation and measurement. (c) 2005 Wiley Periodicals, Inc.