Tunable bandpass filters with constant absolute bandwidth cascaded trisection topology

JingJing Yang, Qianyin Xiang, Xiaoguo Huang, Dinghong Jia and Quanyuan Feng

Journal of Electromagnetic Waves and Applications, 2022, vol. 36, issue 1, 18-28

Abstract: A novel cascade trisection (CT) coupling structure, based on half-wavelength resonators, is proposed for designing constant absolute bandwidth (CABW) tunable bandpass filters. The tunable resonators have both electric and magnetic dominant coupling regions with predefined coupling coefficients. The third-order and fifth-order tunable bandpass filters (BPFs), which can realize CABW and a high side cross-coupling transmission zero (Tz), are designed based on the proposed CT structure. Measurement results show that the central frequency tuning of the third-order filter is from 1.47 to 1.83 GHz with −3dB bandwidth of 108.75 ± 2.05 MHz, and the high side 3 to 25 dB attenuation slope is 327.32–623.57 dB/GHz. The tuning range of the fifth-order filter is from 1.45 to 1.92 GHz with −3dB bandwidth of 101.9 ± 1.3 MHz, and high side 3 to 30 dB attenuation slope is 442.75–843.59 dB/GHz.

Date: 2022
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DOI: 10.1080/09205071.2021.1955752

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