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This paper proposes an automated design method for microstrip filters which comprises topology exploration and parameter optimization stages. In the topology exploration stage, a novel grid-like topology is utilized in conjunction with an efficient generation and deduplication algorithm based on VF2++ isomorphism detection, significantly expanding the available design freedom of RF filter. The parameter optimization depends on a hybrid mode combining simulated annealing and gradient optimization, reducing computation time and simplifying the design process. To validate the method's effectiveness and practicality, a dual-band bandpass filter for 6G communication (1.8–2.7GHz and 3.4–3.7GHz) was successfully designed and implemented within 5 h (4 h of computation and 1 h of manual layout design). The electromagnetic (EM) simulation results show that the filter, within a compact size of \(0.275{\lambda }_{g} \times 0.285{\lambda }_{g}\) , achieves frequency selectivity with an insertion loss below 0.6 dB in the passband, roll-off rates of 71/100 dB/GHz and 180/87 dB/GHz for the first and second frequency passbands respectively, and effective out-of-band suppression.

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Automated Topology Exploration and Design of Passive Microstrip Filters Based on Grid-Like Topology

  • 会议论文

  • 发表日期：

    2026年

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  • Jingyun Bi,
  • Xinyu Zhou

摘要

This paper proposes an automated design method for microstrip filters which comprises topology exploration and parameter optimization stages. In the topology exploration stage, a novel grid-like topology is utilized in conjunction with an efficient generation and deduplication algorithm based on VF2++ isomorphism detection, significantly expanding the available design freedom of RF filter. The parameter optimization depends on a hybrid mode combining simulated annealing and gradient optimization, reducing computation time and simplifying the design process. To validate the method's effectiveness and practicality, a dual-band bandpass filter for 6G communication (1.8–2.7GHz and 3.4–3.7GHz) was successfully designed and implemented within 5 h (4 h of computation and 1 h of manual layout design). The electromagnetic (EM) simulation results show that the filter, within a compact size of \(0.275{\lambda }_{g} \times 0.285{\lambda }_{g}\) , achieves frequency selectivity with an insertion loss below 0.6 dB in the passband, roll-off rates of 71/100 dB/GHz and 180/87 dB/GHz for the first and second frequency passbands respectively, and effective out-of-band suppression.