A MINIATURIZED HIGH-Q DUPLEXER WITH ATTENUATION POLES USING NOVEL MICROSTRIP STACKED OPEN-LOOP RESONATORS

摘要

In this paper, novel microstrip open-loop resonator (OLR) bandpass filters are presented. By introducing additional spiral inductors as well as gap-coupled capacitors, the bandpass filters (BPFs) exhibit another attenuation pole at the upper stopband, Also, a novel miniaturized high-Q duplexer for Universal Mobile Telecommunications System (UMTS) bands using these BPFs is discussed.