{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,9]],"date-time":"2026-05-09T16:54:22Z","timestamp":1778345662605,"version":"3.51.4"},"reference-count":23,"publisher":"MDPI AG","issue":"24","license":[{"start":{"date-parts":[[2020,12,19]],"date-time":"2020-12-19T00:00:00Z","timestamp":1608336000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>This article presents the detailed theoretical, simulation, and experimental analysis of a half-mode substrate integrated waveguide (HMSIW)-based multimode wideband filter. A third-order, semicircular HMSIW filter is developed in this paper. A semicircular HMSIW cavity resonator is adopted to achieve wide band characteristics. A U-shaped slot (acts as a \u03bb\/4 stub) in the center of a semicircular HMSIW cavity resonator and L-shaped open-circuited stubs are used to improve the out-of-band response by generating multiple transmission zeros (TZs) in the stop-band region of the filter. The TZs on either side of the passband can be controlled by adjusting dimensions of a U-shaped slot and L-shaped open-circuited stubs. The proposed filter covers a wide fractional bandwidth, has a lower insertion loss value, and has multiple TZs (which improves the selectivity). The simulated response of filter agrees well with the measured data. The proposed HMSIW bandpass filter can be integrated with any planar wideband communication system circuit, thanks to its planar structure.<\/jats:p>","DOI":"10.3390\/s20247320","type":"journal-article","created":{"date-parts":[[2020,12,21]],"date-time":"2020-12-21T01:01:08Z","timestamp":1608512468000},"page":"7320","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":18,"title":["Multimode HMSIW-Based Bandpass Filter with Improved Selectivity for Fifth-Generation (5G) RF Front-Ends"],"prefix":"10.3390","volume":"20","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-8312-7087","authenticated-orcid":false,"given":"Amjad","family":"Iqbal","sequence":"first","affiliation":[{"name":"Centre For Wireless Technology, Faculty of Engineering, Multimedia University, Cyberjaya 63100, Malaysia"}]},{"given":"Jun","family":"Jiat Tiang","sequence":"additional","affiliation":[{"name":"Centre For Wireless Technology, Faculty of Engineering, Multimedia University, Cyberjaya 63100, Malaysia"}]},{"given":"Sew","family":"Kin Wong","sequence":"additional","affiliation":[{"name":"Centre For Wireless Technology, Faculty of Engineering, Multimedia University, Cyberjaya 63100, Malaysia"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6074-8019","authenticated-orcid":false,"given":"Mohammad","family":"Alibakhshikenari","sequence":"additional","affiliation":[{"name":"Electronic Engineering Department, University of Rome \u201cTor Vergata\u201d, Via del Politecnico 1, 00133 Rome, Italy"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4911-9753","authenticated-orcid":false,"given":"Francisco","family":"Falcone","sequence":"additional","affiliation":[{"name":"Electrical Engineering Department, Public University of Navara, 31006 Pamplona, Spain"},{"name":"Institute of Smart Cities, Public University of Navarre, 31006 Pamplona, Spain"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4668-7461","authenticated-orcid":false,"given":"Ernesto","family":"Limiti","sequence":"additional","affiliation":[{"name":"Electronic Engineering Department, University of Rome \u201cTor Vergata\u201d, Via del Politecnico 1, 00133 Rome, Italy"}]}],"member":"1968","published-online":{"date-parts":[[2020,12,19]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","unstructured":"Iqbal, A., Tiang, J.J., Kwang Lee, C., and Muhammad, S. 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