{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,12]],"date-time":"2025-10-12T04:26:08Z","timestamp":1760243168569,"version":"build-2065373602"},"reference-count":17,"publisher":"MDPI AG","issue":"1","license":[{"start":{"date-parts":[[2015,12,23]],"date-time":"2015-12-23T00:00:00Z","timestamp":1450828800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Micromachines"],"abstract":"<jats:p>In this paper, different configurations of transmission lines loaded with stepped impedance resonators (SIRs) are reviewed. This includes microstrip lines loaded with pairs of SIRs, and coplanar waveguides (CPW) loaded with multi-section SIRs. Due to the high electric coupling between the line and the resonant elements, the structures are electrically small, i.e., dimensions are small as compared to the wavelength at the fundamental resonance. The circuit models describing these structures are discussed and validated, and the potential applications as notch filters and comparators are highlighted.<\/jats:p>","DOI":"10.3390\/mi7010001","type":"journal-article","created":{"date-parts":[[2015,12,23]],"date-time":"2015-12-23T07:10:20Z","timestamp":1450854620000},"page":"1","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Miniature Microwave Notch Filters and Comparators Based on Transmission Lines Loaded with Stepped Impedance Resonators (SIRs)"],"prefix":"10.3390","volume":"7","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-3962-1480","authenticated-orcid":false,"given":"Lijuan","family":"Su","sequence":"first","affiliation":[{"name":"Centre d\u2019Investigaci\u00f3 en Metamaterials per a la Innovaci\u00f3 en Tecnologies Electr\u00f2nica i de Comunicacions (CIMITEC), Departament d\u2019Enginyeria Electr\u00f2nica, Universitat Aut\u00f2noma de Barcelona, 08193 Bellaterra (Barcelona), Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jordi","family":"Naqui","sequence":"additional","affiliation":[{"name":"Centre d\u2019Investigaci\u00f3 en Metamaterials per a la Innovaci\u00f3 en Tecnologies Electr\u00f2nica i de Comunicacions (CIMITEC), Departament d\u2019Enginyeria Electr\u00f2nica, Universitat Aut\u00f2noma de Barcelona, 08193 Bellaterra (Barcelona), Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Javier","family":"Mata-Contreras","sequence":"additional","affiliation":[{"name":"Centre d\u2019Investigaci\u00f3 en Metamaterials per a la Innovaci\u00f3 en Tecnologies Electr\u00f2nica i de Comunicacions (CIMITEC), Departament d\u2019Enginyeria Electr\u00f2nica, Universitat Aut\u00f2noma de Barcelona, 08193 Bellaterra (Barcelona), Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ferran","family":"Mart\u00edn","sequence":"additional","affiliation":[{"name":"Centre d\u2019Investigaci\u00f3 en Metamaterials per a la Innovaci\u00f3 en Tecnologies Electr\u00f2nica i de Comunicacions (CIMITEC), Departament d\u2019Enginyeria Electr\u00f2nica, Universitat Aut\u00f2noma de Barcelona, 08193 Bellaterra (Barcelona), Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2015,12,23]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"16","DOI":"10.1109\/PROC.1979.11196","article-title":"Compact bandpass filters using stepped impedance resonators","volume":"67","author":"Makimoto","year":"1979","journal-title":"IEEE Proc."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"1090","DOI":"10.1109\/TMTT.2005.864126","article-title":"Miniaturized coplanar waveguide bandpass filters using multisection stepped-impedance resonators","volume":"54","author":"Hualiang","year":"2006","journal-title":"IEEE Trans. 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