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Highly miniaturized dual-band bandpass filter with wide bandwidth and large center frequency ratio

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  • Shankar Earla
  • V. Phani Kumar Kanaparthi
  • Vamsi Krishna Velidi

Abstract

The design of a miniaturized dual-band bandpass filter featuring a broad bandwidth and a high center frequency ratio is demonstrated in this article. A novel symmetrically loaded shunt coupled line with dual stepped impedance stubs has been investigated for the first time and it is utilized to realize a dual-band bandpass filter with seven transmission zeros. The transmission zeros frequencies of the filter response have been theoretically verified using even-odd mode analysis. For experimental validation purposes, a dual-band filter with a center frequency ratio of 4.06 covering 5G applications is implemented using Rogers RT/duroid 5870 substrate and tested. The tested filter has wide 3 dB fractional bandwidths of 53.8% and 17.9% in the first and second passbands, respectively, and has a compact topology of 0.20 × 0.09 λg2. The full-wave simulated and tested magnitude and group delay responses of the proposed filter are in good congruence.

Suggested Citation

  • Shankar Earla & V. Phani Kumar Kanaparthi & Vamsi Krishna Velidi, 2024. "Highly miniaturized dual-band bandpass filter with wide bandwidth and large center frequency ratio," Journal of Electromagnetic Waves and Applications, Taylor & Francis Journals, vol. 38(16), pages 1811-1821, November.
    • Handle: RePEc:taf:tewaxx:v:38:y:2024:i:16:p:1811-1821
    DOI: 10.1080/09205071.2024.2400996
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