Cross-Coupled Waveguide Bandpass Filters With Inline Footprint and Extremely Flexible Transmission Zeros

被引：0

作者：

Guo, Zai-Cheng ^{[1
]}

Li, Lu-Yan ^{[1
]}

Wang, Anqi ^{[1
]}

Wang, Xuedao ^{[2
,3
]}

Zhu, Lei ^{[4
]}

机构：

[1] Nanjing Normal Univ, Sch Elect & Automat Engn, Jiangsu Key Lab 3D Printing Equipment & Mfg, Nanjing 210023, Peoples R China

[2] Jinling Inst Technol, Sch Elect & Informat Engn, Nanjing 211169, Peoples R China

[3] Nanjing Univ Sci & Technol, Sch Elect & Opt Engn, Nanjing 210094, Peoples R China

[4] Univ Macau, Fac Sci & Technol, Dept Elect & Comp Engn, Macau, Peoples R China

来源：

IEEE MICROWAVE AND WIRELESS TECHNOLOGY LETTERS | 2025年

基金：

中国国家自然科学基金;

关键词：

Couplings; Band-pass filters; Passband; Resonator filters; Microwave filters; Filtering theory; Resonant frequency; Fabrication; Wireless communication; Tolerance analysis; Bandpass filter (BPF); cross coupling; inline footprint; transmission zero (TZ); waveguide filter; DESIGN;

D O I：

10.1109/LMWT.2025.3529695

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

A new class of cross-coupled waveguide bandpass filters (BPFs) with inline footprints is proposed in this letter. The cross coupling is realized by a thin resonant cavity, whose resonant frequency is offset from the center frequency. Due to the cross coupling, a transmission zero (TZ) is produced on either side of the passband without negative coupling structures, even extremely close to the passband. The spurious spikes resulting from the cross-coupled cavity are suppressed by increasing the filter order. Consequently, a fifth-order BPF with a pair of TZs outside the passband and spurious-mode suppression is designed, fabricated, and measured. The measured results demonstrate the feasibility of the proposed BPF.

引用

页数：4

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