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A bandwidth-tunable balanced filter with a broad tuning range and a wide minimum bandwidth

Author

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  • Xianlong Dou
  • Wei Zhang
  • Jianpeng Ren
  • Jin Shi

Abstract

A bandwidth-tunable balanced filter (BTBF) is proposed, which utilizes the quarter-wavelength coupled lines with multi-point loaded varactors and half-wavelength transmission lines. The varactor-loaded coupled lines combined with the pair of the half-wavelength transmission lines provide the basic wideband differential-mode (DM) passband and common-mode (CM) suppression, and the loaded varactors can tune the lower edge, the upper edge and the impedance matching (IM) of the passband. Thus, tunable bandwidth with almost constant center frequency can be achieved by controlling the bridged varactor Cv1 and the series varactors Cv2 and Cv3. Compared to the state-of-the-art designs, the proposed design offers significant advantages of broad tuning range of DM bandwidth, wide minimum DM bandwidth, low insertion loss, and simple structure. For demonstration, a prototype is designed with the DM bandwidth tuning range of 24.7%, the minimum DM fractional bandwidth (FBW) of 46.5%, the maximum insertion loss inside the IM bandwidth of 2.3 dB.

Suggested Citation

  • Xianlong Dou & Wei Zhang & Jianpeng Ren & Jin Shi, 2024. "A bandwidth-tunable balanced filter with a broad tuning range and a wide minimum bandwidth," Journal of Electromagnetic Waves and Applications, Taylor & Francis Journals, vol. 38(12), pages 1387-1405, August.
    • Handle: RePEc:taf:tewaxx:v:38:y:2024:i:12:p:1387-1405
    DOI: 10.1080/09205071.2024.2372683
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