【摘要】 紧凑型宽带多零点带通滤波器由于其具有宽频带覆盖与高选择性、陡峭带外抑制等特点，可以采用多模谐振与混合结构设计，加强非线性响应与抗干扰能力，实现相对带宽超过100%的超宽带覆盖、宽阻带的性能。提出了一种基于平行耦合线结构的紧凑型宽带多零点带通滤波器设计。该设计采用新型紧凑耦合线级联宽阻带结构，在保持宽带特性的同时实现了多传输零点，有效拓展了阻带带宽。研究内容包括：滤波器谐振机理与零点特性分析、参数灵敏度研究、电磁仿真建模与优化。最终实测结果表明，3.5 GHz～6.5 GHz的频带内回波损耗优于10 dB，中心频率处插损约为0.29 dB,3-dB FBW为91.2%，其带外抑制在4倍中心频率（20 GHz）处达到20 dB。更多还原

【Abstract】 Compact broadband multi-zero bandpass filters(BPFs) demonstrate superior performance including wide bandwidth, high selectivity, and sharp out-of-band rejection. By employing multi-mode resonance and hybrid structure designs, these filters enhance nonlinear response and interference suppression, achieving ultra-wideband operation(>100% relative bandwidth) while maintaining excellent stopband performance. This paper presents a compact broadband bandpass filter design with multiple transmission zeros based on a parallel-coupled line structure. The proposed design employs a novel cascaded compact coupled-line structure with a wide stopband, achieving multiple transmission zeros while maintaining broadband characteristics, thereby effectively extending the stopband bandwidth. The research includes: analysis of the filter’s resonance mechanism and transmission zero characteristics, parameter sensitivity study, electromagnetic simulation modeling, and optimization. The final measured results demonstrate a return loss better than 10 dB within the 3.5 GHz ～ 6.5 GHz frequency band, an insertion loss of approximately 0.29 dB at the center frequency, a 3-dB fractional bandwidth(FBW) of 91.2%, and an out-of-band suppression of 20 dB at four times the center frequency(20 GHz).更多还原