In this paper, dual-band and tri-band bandpass filters (BPFs) with fully independent and controllable passbands based on multipath-embedded resonators are presented. The dual-band BPF consists of two double open-ended stub-loaded terminal-shorted resonators (DOESL-TSRs) with a common via-hole connected along the symmetric plane of the filter. Based on DOESL-TSRs, a triple open-ended stub-loaded terminal-shorted resonator (TOESL-TSR) is proposed in the design of tri-band BPFs. The resonant characteristics of DOESL-TSR/TOESL-TSR are analyzed by the numerical calculation method. The measured results of the dual-band BPF show that the center frequencies (CFs) are located at 2.595 and 5.75 GHz, respectively, with 3 dB fraction bandwidth (FBWs) of 15 and 12.8%. The measured CFs of the tri-band BPF are located at 2.545, 3.775, and 5.95 GHz, respectively, with 3 dB FBWs of 9.8, 9.3, and 5.5%. Both of the filters exhibit the merits of fully independent and controllable passbands, high selectivity, and compact size.

中文翻译：

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基于多径嵌入式谐振器的具有完全独立和可控通带的双/三带通滤波器

在本文中，提出了基于多径嵌入式谐振器的具有完全独立和可控通带的双波段和三波段带通滤波器 (BPF)。双频带 BPF 由两个双开端短截线负载终端短路谐振器 (DOESL-TSR) 组成，其中一个公共通孔沿滤波器的对称平面连接。在DOESL-TSRs的基础上，在三频段BPF的设计中提出了一种三重开路短截线负载端短路谐振器（TOESL-TSR）。采用数值计算方法分析了DOESL-TSR/TOESL-TSR的谐振特性。双频 BPF 的测量结果表明，中心频率（CF）分别位于 2.595 和 5.75 GHz，3 dB 分数带宽（FBW）分别为 15% 和 12.8%。三频 BPF 的测量 CF 分别位于 2.545、3.775 和 5.95 GHz，3 dB FBW 分别为 9.8、9.3 和 5.5%。两种滤波器都具有通带完全独立可控、选择性高、体积小等优点。