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Design of compact dual-band bandpass filters using λ/2 and combined λ/4 stepped-impedance resonators

✍ Scribed by Ching-Her Lee; Yi-Huan Hsieh; Min-Hua Ho

Publisher: John Wiley and Sons
Year: 2007
Tongue: English
Weight: 208 KB
Volume: 49
Category: Article
ISSN: 0895-2477
DOI: 10.1002/mop.22823

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✦ Synopsis

Abstract

This paper presents a compact dual‐band bandpass filter (BPF) that consists of a pair of L‐shape half‐wavelength (λ/2) stepped‐impedance resonators (SIRs) and an inverted Z‐shape resonator. The latter is actually a combined structure of two λ/4 SIRs along with a magnetic coupling in between and hence designed to reduce the circuit size. Cross‐coupled SIR configuration and 0° tapped‐feed structures are adopted to introduce attenuation poles around the passband edges for selectivity improvement. A wider −20‐dB upper stopband is achieved by properly separating the third resonant frequencies of the SIRs of different types. The newly designed dual‐band BPF was verified by circuit implementation, and a very good agreement between the simulated and measured results was observed. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 2703–2706, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22823

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