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<p>Dual-band filters have become essential front-end modules for modern transceivers and wireless systems. In this work, a sub-THz band dual-band cavity filter is synthesized through linearly coupling three mixed TE<sub>301</sub>- and TE<sub>102</sub>-mode cavities. Full high-order mode resonators can feature the high <i>Q</i>-factor and weak error susceptibility, which are strong candidates for high frequency waveguide filter designing. The TE<sub>301</sub>-mode and TE<sub>102</sub>-mode can be independently regarded as each operating passband mode for this 3rd-order dual-band filter. In addition, three extra transmission zeros have been generated for improving out-of-band suppression with adopting the singlet concept. The filter prototype fabricated by the CNC technology has achieved 3-dB fractional bandwidths of 3.1% (93.4–96.3&#xa0;GHz) and 3.5% (99.5–103.1&#xa0;GHz), and the return losses are both better than − 15&#xa0;dB. The low insertion losses of − 0.6&#xa0;dB and − 0.5&#xa0;dB have been obtained too. The measured results are agreement well with simulations. The performance of this dual-band filter is highlighted comparing with the reported ones.</p>

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Sub-THz Fully Inline Dual-band Filter Based on High-Order Mode Resonators

  • 期刊论文

  • 发表日期：

    2025年12月7日

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  • Jiang-Qiao Ding,
  • Yi Yuan,
  • Qi-Yao Liang,
  • Rong-Huai Nie,
  • Jun Jiang

摘要

Dual-band filters have become essential front-end modules for modern transceivers and wireless systems. In this work, a sub-THz band dual-band cavity filter is synthesized through linearly coupling three mixed TE301- and TE102-mode cavities. Full high-order mode resonators can feature the high Q-factor and weak error susceptibility, which are strong candidates for high frequency waveguide filter designing. The TE301-mode and TE102-mode can be independently regarded as each operating passband mode for this 3rd-order dual-band filter. In addition, three extra transmission zeros have been generated for improving out-of-band suppression with adopting the singlet concept. The filter prototype fabricated by the CNC technology has achieved 3-dB fractional bandwidths of 3.1% (93.4–96.3 GHz) and 3.5% (99.5–103.1 GHz), and the return losses are both better than − 15 dB. The low insertion losses of − 0.6 dB and − 0.5 dB have been obtained too. The measured results are agreement well with simulations. The performance of this dual-band filter is highlighted comparing with the reported ones.