A Flat-Passband Predistorted Bandpass Filter With Folded Substrate Integrated Waveguide

IF 4 2区工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEE Transactions on Circuits and Systems II: Express Briefs Pub Date : 2021-06-28 DOI:10.1109/TCSII.2021.3092973

Liang-Feng Qiu;Bing Xie;Lin-Sheng Wu;Jun-Fa Mao

{"title":"A Flat-Passband Predistorted Bandpass Filter With Folded Substrate Integrated Waveguide","authors":"Liang-Feng Qiu;Bing Xie;Lin-Sheng Wu;Jun-Fa Mao","doi":"10.1109/TCSII.2021.3092973","DOIUrl":null,"url":null,"abstract":"A predistorted folded substrate integrated waveguide (FSIW) filter is developed for a flat passband. The unloaded \n<inline-formula> <tex-math>${Q}$ </tex-math></inline-formula>\n-factor of FSIW cavity is predicted numerically and then applied to the coupling matrix synthesis. A filter prototype is fabricated with the low temperature cofired ceramic technology (LTCC), where the direct and cross couplings are realized in a 3D configuration. The synthesized, simulated and measured results agree well with each other. The insertion loss is 3.48 dB at 5 GHz and the 0.2-dB bandwidth is 338 MHz which is equivalent to a conventional filter with the uniform unloaded \n<inline-formula> <tex-math>${Q}$ </tex-math></inline-formula>\n-factor of 870, much higher than the one of 180 provided by the applied FSIW resonator. Two transmission zeros locate at 4.50 and 5.46 GHz to improve the frequency selectivity. The filter size is only \n<inline-formula> <tex-math>$18.04\\times 9.2\\times 1.4$ </tex-math></inline-formula>\n mm\n<sup>3</sup>\n and the occupied area is \n<inline-formula> <tex-math>$0.72\\times 0.37\\,\\,\\lambda _{d}^{2}$ </tex-math></inline-formula>\n.","PeriodicalId":13101,"journal":{"name":"IEEE Transactions on Circuits and Systems II: Express Briefs","volume":"69 2","pages":"324-328"},"PeriodicalIF":4.0000,"publicationDate":"2021-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"8","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"IEEE Transactions on Circuits and Systems II: Express Briefs","FirstCategoryId":"5","ListUrlMain":"https://ieeexplore.ieee.org/document/9466236/","RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"ENGINEERING, ELECTRICAL & ELECTRONIC","Score":null,"Total":0}

引用次数: 8

Abstract

A predistorted folded substrate integrated waveguide (FSIW) filter is developed for a flat passband. The unloaded

${Q}$

-factor of FSIW cavity is predicted numerically and then applied to the coupling matrix synthesis. A filter prototype is fabricated with the low temperature cofired ceramic technology (LTCC), where the direct and cross couplings are realized in a 3D configuration. The synthesized, simulated and measured results agree well with each other. The insertion loss is 3.48 dB at 5 GHz and the 0.2-dB bandwidth is 338 MHz which is equivalent to a conventional filter with the uniform unloaded

${Q}$

-factor of 870, much higher than the one of 180 provided by the applied FSIW resonator. Two transmission zeros locate at 4.50 and 5.46 GHz to improve the frequency selectivity. The filter size is only

$18.04\times 9.2\times 1.4$

mm ³ and the occupied area is

$0.72\times 0.37\,\,\lambda _{d}^{2}$

查看原文本刊更多论文

折叠衬底集成波导平板带通预失真带通滤波器

针对平面通带，提出了一种预失真折叠基片集成波导滤波器。对FSIW腔的空载${Q}$因子进行了数值预测，并将其应用于耦合矩阵的综合。利用低温共烧陶瓷技术（LTCC）制作了一个滤波器原型，其中直接耦合和交叉耦合以3D配置实现。合成结果、模拟结果和实测结果基本一致。在5GHz下插入损耗为3.48dB，0.2dB带宽为338MHz，这相当于具有870的均匀无负载${Q}$因子的传统滤波器，远高于所应用的FSIW谐振器提供的180因子。两个传输零点分别位于4.50和5.46 GHz，以提高频率选择性。过滤器大小仅为$18.04\乘以9.2\乘以1.4$mm3，占用面积为$0.72\乘以0.37\，\，\lambda _｛d｝^｛2｝$。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

IEEE Transactions on Circuits and Systems II: Express Briefs 工程技术-工程：电子与电气

CiteScore

7.90

自引率

20.50%

发文量

883

审稿时长

3.0 months

期刊介绍： TCAS II publishes brief papers in the field specified by the theory, analysis, design, and practical implementations of circuits, and the application of circuit techniques to systems and to signal processing. Included is the whole spectrum from basic scientific theory to industrial applications. The field of interest covered includes: Circuits: Analog, Digital and Mixed Signal Circuits and Systems Nonlinear Circuits and Systems, Integrated Sensors, MEMS and Systems on Chip, Nanoscale Circuits and Systems, Optoelectronic Circuits and Systems, Power Electronics and Systems Software for Analog-and-Logic Circuits and Systems Control aspects of Circuits and Systems.