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<p>Modern wireless systems demand compact, power-efficient radio frequency (RF) front-end components that support wideband tunability and nonreciprocity. We present a class of miniature bandpass filter that achieves both continuously tunable frequency operation (4.0–17.7 GHz) and high nonreciprocity ( &gt; 25 dB), all within a compact size of 1.07 cm³. The filter employs a microfabricated 18 µm thick Yttrium Iron Garnet (YIG) waveguide with meander-line aluminum transducers, enabling low-loss unidirectional propagation via magnetostatic surface waves. Leveraging a benzocyclobutene planarization fabrication process, this study enables a dispersion profile unique to thick YIG films, resulting in enhanced filter skirt performance with minimal spurious modes. Frequency tuning is enabled by a zero-static-power magnetic bias circuit using transient current pulses, eliminating continuous power consumption. The filter demonstrates low insertion loss (3–5 dB), high out-of-band rejection ( &gt; 30 dB), narrow bandwidth (100–200 MHz), robust power handling ( &gt; 10.4 dBm), and high linearity (IIP3 &gt; 26 dBm).</p>

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A wideband tunable, nonreciprocal bandpass filter using magnetostatic surface waves with zero static power consumption

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年1月14日

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  • Xingyu Du,
  • Yixiao Ding,
  • Shun Yao,
  • Yijie Ding,
  • Dengyang Lu,
  • Shuxian Wu,
  • Chin-Yu Chang,
  • Xuan Wang,
  • Mark G. Allen,
  • Roy H. Olsson III

摘要

Modern wireless systems demand compact, power-efficient radio frequency (RF) front-end components that support wideband tunability and nonreciprocity. We present a class of miniature bandpass filter that achieves both continuously tunable frequency operation (4.0–17.7 GHz) and high nonreciprocity ( > 25 dB), all within a compact size of 1.07 cm³. The filter employs a microfabricated 18 µm thick Yttrium Iron Garnet (YIG) waveguide with meander-line aluminum transducers, enabling low-loss unidirectional propagation via magnetostatic surface waves. Leveraging a benzocyclobutene planarization fabrication process, this study enables a dispersion profile unique to thick YIG films, resulting in enhanced filter skirt performance with minimal spurious modes. Frequency tuning is enabled by a zero-static-power magnetic bias circuit using transient current pulses, eliminating continuous power consumption. The filter demonstrates low insertion loss (3–5 dB), high out-of-band rejection ( > 30 dB), narrow bandwidth (100–200 MHz), robust power handling ( > 10.4 dBm), and high linearity (IIP3 > 26 dBm).