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

Shankar Earla, V. Phani Kumar Kanaparthi and Vamsi Krishna Velidi

Journal of Electromagnetic Waves and Applications, 2024, vol. 38, issue 16, 1811-1821

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.

Date: 2024
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DOI: 10.1080/09205071.2024.2400996

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