volume | PIER Journals

Abstract

In this letter, a novel ultra-wideband (UWB) bandpass filter (BPF) configuration with a quad-mode resonator (QMR) structure is proposed, which hasa highly selective and compact performance. The QMR is composed of a funnel-shaped resonator loaded in the middle and a low-impedance folded microstrip line. Initially, the resonant frequencies are uniformly distributed in the UWB passband by varying the length of QMR physical stubs, and later the three-line parallel coupled lines are employed to enhance coupling to obtain a flat passband. The feedlines are then loaded with a pair of λ/2 stepped impedance radial stubs (SIRSs) to provide excellent band-stop characteristics. Finally, a filter prototype is created, and its performance is evaluated using the generated data. The proposed UWB filter has sharp roll-off ratio of 99 and 63 dB/GHz, respectively, at the lower and upper edges of the passband.

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Dr. Guangyong Wei

Professor Yun Xiu Wang

Dr. Jie Liu

Dr. Yang Gao

Mr. Xiao Tao Yao