A compact CPW-Fed UWB BPF using combined microstrip SIR

✍ Scribed by Yu-Cheng Chen; Ching-Her Lee; Chung-I. G. Hsu

• Publisher: John Wiley and Sons
• Year: 2009
• Tongue: English
• Weight: 278 KB
• Volume: 51
• Category: Article
• ISSN: 0895-2477
• DOI: 10.1002/mop.24199

✦ Synopsis

Abstract

This article presents a multimode‐resonator (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 (λ/4) microstrip stepped‐impedance resonators (SIRs) in a structure‐shared fashion. The first two resonant frequencies of the inherent λ/4 SIRs and the fundamental one of the embedded half‐wavelength (λ/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 loss of less than 1 dB between the first and the last |S11| null frequencies in the UWB passband and an upper −20‐dB stopband bandwidth of about 6.14 GHz. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 918–921, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24199