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Compact tunable wideband bandpass filter using mixed coupling lumped dual-mode resonator

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  • Jin Xu

Abstract

In this paper, a compact microstrip varactor-tuned wideband bandpass filter (BPF) is proposed by using mixed coupling lumped dual-mode resonator. The proposed tunable wideband BPF has a pair of transmission zeros around the passband, resulting in high passband selectivity. The measured results show that the passband can be tuned in a frequency range from 1.01 to 2.04 GHz with an almost 3 dB constant fractional bandwidth of 28 ± 1%. Within the tuning range, the insertion loss varies from 2.1 to 1.65 dB and the return loss is better than 10 dB. In addition, the tunability of 3 dB fractional bandwidth at 1.5 GHz is from 23 to 43%.

Suggested Citation

  • Jin Xu, 2016. "Compact tunable wideband bandpass filter using mixed coupling lumped dual-mode resonator," Journal of Electromagnetic Waves and Applications, Taylor & Francis Journals, vol. 30(6), pages 714-720, April.
    • Handle: RePEc:taf:tewaxx:v:30:y:2016:i:6:p:714-720
    DOI: 10.1080/09205071.2016.1145074
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