Compact Quarter Mode and Eighth Mode Substrate Integrated Waveguide Bandpass Filters with Frequency-Dependent Coupling

被引：2

作者：

Shi, Zhiwei ^{[1
]}

Li, Guohui ^{[1
]}

Song, Yulu ^{[1
]}

Cheng, Binbin ^{[1
]}

机构：

[1] Shanghai Univ, Key Lab Specialty Fiber Opt & Opt Access Network, Shanghai, Peoples R China

来源：

PROGRESS IN ELECTROMAGNETICS RESEARCH LETTERS | 2021年 / 97卷

关键词：

15;

D O I：

10.2528/PIERL21012201

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：

This paper presents two size-miniaturized quarter mode (QM) and eighth mode (EM) substrate integrated waveguide (SIW) bandpass filters (BPFs), which are embedded with a novel frequency-dependent coupling (FDC) structure. The proposed FDC is implemented as a composition of balanced folding lines and inductive iris. One additional transmission zero (TZ) introduced by FDC between two cavities leads to higher frequency selectivity and better out-of-band rejection. Higher order modes suppression appears by combining the loaded open stubs on feeder lines with FDC technique, achieving a wide stopband. Meanwhile, the circuit dimension is further reduced by symmetrically cutting SIW. To validate the novel approach, the frequency-dependent coupling matrix (CM) is implemented to determine characteristics of the proposed structure in theory. QM- and EM-SIW BPFs loaded with FDC have been designed, fabricated, and measured. Experimental results illustrate the characteristics of miniaturization and good performance. All results are in good agreement.

引用

页码：51 / 59

页数：9

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