{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,2,21]],"date-time":"2026-02-21T19:26:00Z","timestamp":1771701960698,"version":"3.50.1"},"reference-count":56,"publisher":"MDPI AG","issue":"13","license":[{"start":{"date-parts":[[2023,7,5]],"date-time":"2023-07-05T00:00:00Z","timestamp":1688515200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100001840","name":"Icelandic Centre for Research (RANNIS)","doi-asserted-by":"publisher","award":["217771"],"award-info":[{"award-number":["217771"]}],"id":[{"id":"10.13039\/501100001840","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100001840","name":"Icelandic Centre for Research (RANNIS)","doi-asserted-by":"publisher","award":["2020\/37\/B\/ST7\/01448"],"award-info":[{"award-number":["2020\/37\/B\/ST7\/01448"]}],"id":[{"id":"10.13039\/501100001840","id-type":"DOI","asserted-by":"publisher"}]},{"name":"National Science Centre of Poland","award":["217771"],"award-info":[{"award-number":["217771"]}]},{"name":"National Science Centre of Poland","award":["2020\/37\/B\/ST7\/01448"],"award-info":[{"award-number":["2020\/37\/B\/ST7\/01448"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>The article presents a novel circular substrate-integrated waveguide (SIW) bandpass filter (BPF) with controllable bandwidth. The proposed BPF was configured using two microstrip feed lines, semi-circular SIW cavities, capacitive slots, and inductive vias. The circular cavity was divided into two halves, and the two copies were cascaded. The resulting bisected and cascaded structures were then connected back-to-back. Finally, by introducing two inductive vias to the circular center cavity, a transmission zero was generated. In order to examine the design concept, a coupling matrix was generated. To demonstrate the theory, a third-order BPF was realized, fabricated, and experimentally validated. The BPF prototype features a wide passband of 8.7%, a low insertion loss of 1.1 dB, and a stopband of 1.5 f0 with a rejection level better than 20 dB, which makes it a potential candidate for microwave sensing and communication industries.<\/jats:p>","DOI":"10.3390\/s23136162","type":"journal-article","created":{"date-parts":[[2023,7,6]],"date-time":"2023-07-06T00:54:41Z","timestamp":1688604881000},"page":"6162","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":7,"title":["Bandwidth-Controllable Third-Order Band Pass Filter Using Substrate-Integrated Full- and Semi-Circular Cavities"],"prefix":"10.3390","volume":"23","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-3670-9604","authenticated-orcid":false,"given":"Nrusingha Charan","family":"Pradhan","sequence":"first","affiliation":[{"name":"Engineering Optimization and Modeling Center, Reykjavik University, 102 Reykjavik, Iceland"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9063-2647","authenticated-orcid":false,"given":"Slawomir","family":"Koziel","sequence":"additional","affiliation":[{"name":"Engineering Optimization and Modeling Center, Reykjavik University, 102 Reykjavik, Iceland"},{"name":"Faculty of Electronics, Telecommunication and Informatics, Gdansk University of Technology, 80-233 Gdansk, Poland"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7691-2485","authenticated-orcid":false,"given":"Rusan Kumar","family":"Barik","sequence":"additional","affiliation":[{"name":"Engineering Optimization and Modeling Center, Reykjavik University, 102 Reykjavik, Iceland"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2319-6782","authenticated-orcid":false,"given":"Anna","family":"Pietrenko-Dabrowska","sequence":"additional","affiliation":[{"name":"Faculty of Electronics, Telecommunication and Informatics, Gdansk University of Technology, 80-233 Gdansk, Poland"}]}],"member":"1968","published-online":{"date-parts":[[2023,7,5]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"593","DOI":"10.1109\/TMTT.2002.807820","article-title":"Single-substrate integration technique of planar circuits and waveguide filters","volume":"51","author":"Deslandes","year":"2003","journal-title":"IEEE Trans. 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