{"title":"Quad-Band Bandpass Filter Using Asymmetric Short Stub Loaded E-Type Resonators","authors":"Meng Liu, Lei Chen, Jin Yi Liu, Tian Tian Zhang","doi":"10.1002/mop.70334","DOIUrl":null,"url":null,"abstract":"<div>\n \n <p>In this study, a quad-band bandpass filter (BPF) with high selectivity and independently controllable passbands is proposed. The proposed BPF is achieved by employing two pairs of asymmetric short stub loaded E-type resonators. Each pair of E-type resonators achieves a dual-frequency filtering characteristic. One pair of E-type resonators operates at 1.57 and 3.0 GHz, and the other pair operates at 2.4 and 3.5 GHz, respectively. The three lines parallel coupling (TLPC) structure is employed between the source and load to generate eight transmission zeros (TZs), which greatly improves the selectivity of the filter. To verify the feasibility of the proposed model, a prototype was designed and fabricated, whose simulations and measurements are in good agreement.</p>\n </div>","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"67 8","pages":""},"PeriodicalIF":1.2000,"publicationDate":"2025-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Microwave and Optical Technology Letters","FirstCategoryId":"5","ListUrlMain":"https://onlinelibrary.wiley.com/doi/10.1002/mop.70334","RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"ENGINEERING, ELECTRICAL & ELECTRONIC","Score":null,"Total":0}
引用次数: 0
Abstract
In this study, a quad-band bandpass filter (BPF) with high selectivity and independently controllable passbands is proposed. The proposed BPF is achieved by employing two pairs of asymmetric short stub loaded E-type resonators. Each pair of E-type resonators achieves a dual-frequency filtering characteristic. One pair of E-type resonators operates at 1.57 and 3.0 GHz, and the other pair operates at 2.4 and 3.5 GHz, respectively. The three lines parallel coupling (TLPC) structure is employed between the source and load to generate eight transmission zeros (TZs), which greatly improves the selectivity of the filter. To verify the feasibility of the proposed model, a prototype was designed and fabricated, whose simulations and measurements are in good agreement.
期刊介绍：
Microwave and Optical Technology Letters provides quick publication (3 to 6 month turnaround) of the most recent findings and achievements in high frequency technology, from RF to optical spectrum. The journal publishes original short papers and letters on theoretical, applied, and system results in the following areas.
- RF, Microwave, and Millimeter Waves
- Antennas and Propagation
- Submillimeter-Wave and Infrared Technology
- Optical Engineering
All papers are subject to peer review before publication
求助内容：
应助结果提醒方式：
京公网安备 11010802042870号
