Wideband bandpass filter based on ring resonator with high selectivity and multiple transmission zeros

• Published in: Electronics letters Vol. 50; no. 5; pp. 384 - 386
• Main Authors: Zhou, J.G, Chiang, Y.C, Che, W.Q
• Format: Journal Article
• Language: English
• Published: Stevenage The Institution of Engineering and Technology 27.02.2014; Institution of Engineering and Technology; John Wiley & Sons, Inc
• Subjects: Applied sciences; Bandpass filters; band‐pass filters; Circuit properties; Electric, optical and optoelectronic circuits; Electronic circuits; Electronics; Exact sciences and technology; frequency 4.14 GHz to 9.56 GHz; Frequency bands; Frequency filters; high‐selectivity wideband bandpass filter; Microwave circuits, microwave integrated circuits, microwave transmission lines, submillimeter wave circuits; microwave filters; Microwave technology; multiple transmission poles; multiple transmission zeros; Poles; Rejection; resonator filters; Resonators; ring resonator; Simulation; SIR; Stepped; stepped impedance resonators; Wideband; resonator filters; multiple transmission poles; band-pass filters; stepped impedance resonators; frequency 4.14 GHz to 9.56 GHz; microwave filters; multiple transmission zeros; high-selectivity wideband bandpass filter; SIR; ring resonator; GHz range; Prototype; Frequency band; Wide band; Ring resonator; Stepped impedance device; Bandwidth; Band pass filter; Selectivity; Microwave resonator; Transmission zero; Pole zero method
• ISSN: 0013-5194; 1350-911X; 1350-911X
• DOI: 10.1049/el.2013.2908

A high-selectivity wideband bandpass filter consisting of a ring resonator and stepped impedance resonators is proposed. A wideband bandpass filter with multiple transmission poles and transmission zeros is obtained. For demonstration, a prototype operating at the frequency band of 4.14–9.56 GHz (with a fractional bandwidth of 79.1%) is designed and fabricated. Good agreements between the simulated and the measured results have been observed, indicating a very sharp out-of-band rejection.