Miniaturized Bandpass Filters Using MISL-Based Slow Wave Meander Line Resonators

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Abstract
This letter proposes a miniaturized wideband bandpass filter (BPF) with flexible transmission zeros (TZs) using slow wave meander line resonators (SWMLRs) based on metal integrated suspended line (MISL) technology. The TZ positions of the BPF are flexibly controllable via different SWMLR arrangements. A third-order BPF is designed and fabricated by introducing separate electric and magnetic coupling paths (SEMCPs) and source-load coupling, enabling multiple TZs on both sides of the passband. Benefiting from the all-metal MISL structure (copper sheets), the BPF eliminates dielectric loss, achieving a low insertion loss (IL) of 0.28 dB. The filter size is as compact as $0.11\lambda _{g} \times 0.092\lambda _{g} \times 0.067\lambda _{g}$ . Finally, the measured results were in good agreement with the simulation results, verifying the proposed design as a promising solution for miniaturized high-performance microwave filters.
Funding Information
  • National Natural Science Foundation of China (62301358)
  • National Natural Science Foundation of China (62341409)
  • National key laboratory of science and technology on space microwave (HTKJ2025KL504008)
  • National Natural Science Foundation of China (2024T170638)

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