A COMPACT CPW-FED UWB BPF USING COMBINED MICROSTRIP SIR

作者：Chen Yu Cheng; Lee Ching Her^*; Hsu Chung I G

来源：Microwave and Optical Technology Letters, 2009, 51(4): 918-921.

DOI：10.1002/mop.24199

• multimode resonator
• ultra-wideband bandpass filter
• coplanar waveguide
• stepped-impedance resonator

This article presents a multimode-resoncaor (MMR)-based ultra-wideband (UWB) bandpass filter (BPF) fed by modified coplanar waveguides (CPWs). The MMR employed in the UWB BPF is formed by combining two quarter-wavelength (lambda/4) microstrip stepped-impedance resonators (SIRs) in a structure-shared fashion. The first two resonant frequencies of the inherent lambda/4 SIRs and the fundamental one of the embedded hay-wavelength (lambda/2) resonator were designed and located inside the UWB passband. Experiments on a prototype UWB BPF were carried out for validating the filter design. The measured frequency responses show an insertion of less than 1 dB between the first and the last vertical bar S(11)vertical bar null frequencies in the UWB passband and an upper -20-dB stopband band-width of about 6.14 GHz.

• 出版日期2009-4