Compact Balanced Bandpass Filter Design Using Asymmetric SIR Pairs and Spoof Surface Plasmon Polariton Feeding Structure

This letter demonstrates a design of a compact balanced bandpass filter (BPF) with stopband extension and common-mode (CM) suppression using asymmetric stepped-impedance resonator (SIR) pairs and a spoof surface plasmon polariton (SPP) feeding structure. The configuration of balanced SIR pairs is an...

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Bibliographic Details
Published inIEEE microwave and wireless components letters Vol. 28; no. 11; pp. 987 - 989
Main Authors Liu, Haiwen, Liu, Tiankang, Zhang, Qingfeng, Ren, Baoping, Wen, Pin
Format Journal Article
LanguageEnglish
Published IEEE 01.11.2018
Subjects
Balanced filter
Band-pass filters
common-mode (CM) suppression
Impedance
Passband
Resonant frequency
spoof surface plasmon polariton (SPP)
stepped-impedance resonator (SIR) pairs
wide stopband
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Summary:This letter demonstrates a design of a compact balanced bandpass filter (BPF) with stopband extension and common-mode (CM) suppression using asymmetric stepped-impedance resonator (SIR) pairs and a spoof surface plasmon polariton (SPP) feeding structure. The configuration of balanced SIR pairs is analyzed theoretically to obtain a wide stopband response and intrinsic CM suppression within differential-mode passband. Moreover, a novel SPP feeding structure is adopted as a low-pass filter and impedance matching section for enhancing filter transmission responses. Finally, a balanced BPF operating at 0.85 GHz with the SPP feeding structure is designed and fabricated to verify the design method.
ISSN:1531-1309
1558-1764
DOI:10.1109/LMWC.2018.2873209