{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,2,24]],"date-time":"2026-02-24T18:14:44Z","timestamp":1771956884165,"version":"3.50.1"},"reference-count":24,"publisher":"MDPI AG","issue":"21","license":[{"start":{"date-parts":[[2021,10,26]],"date-time":"2021-10-26T00:00:00Z","timestamp":1635206400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"FRIDA-UAM","award":["12713607"],"award-info":[{"award-number":["12713607"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>In this article, a combination of rectangular loop array and slot radiator for multiband applications is presented. The antenna is configured by arranging, concentrically, a set of rectangular loop radiators excited by electromagnetic coupling provided by a dumbbell slot. The size of the loops is calculated to obtain the desired resonant frequencies, which are almost independent of the adjacent rings. The exciting slot is designed to operate in a wideband frequency range to cover the upper desired resonance. In addition, to obtain directive radiation patterns, a reflector shaped like a box is introduced, giving a stable gain, radiation pattern shape, and port matching at the selected frequencies. The configuration presents great results, since to the authors\u2019 knowledge, even a similar configuration given in the open literature presents some disadvantages compared to this one; moreover, not just any structure can be employed as the resonating elements, obtaining multiband behavior at the same time.<\/jats:p>","DOI":"10.3390\/s21217082","type":"journal-article","created":{"date-parts":[[2021,10,26]],"date-time":"2021-10-26T23:54:33Z","timestamp":1635292473000},"page":"7082","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Directive Multiband Antenna Based on Rectangular Loop Array and Dumbbell-Shaped Slot Radiator"],"prefix":"10.3390","volume":"21","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-3288-4416","authenticated-orcid":false,"given":"Jose Alfredo","family":"Tirado-Mendez","sequence":"first","affiliation":[{"name":"Instituto Polit\u00e9cnico Nacional, SEPI, ESIME-Zacatenco, Av. IPN S\/N, U.P. Adolfo Lopez Mateos, Mexico City 07738, Mexico"},{"name":"UAM-Iztapalapa, Electrical Department, Av. San Rafael Atlixco 186, Leyes de Reforma 1ra Secc, Iztapalapa, Mexico City 09340, Mexico"}]},{"given":"Hildeberto","family":"Jardon-Aguilar","sequence":"additional","affiliation":[{"name":"Telecommunications Section, CINVESTAV-IPN, Av. IPN 2508, San Pedro Zacatenco, Mexico City 07360, Mexico"}]},{"given":"Ruben","family":"Flores-Leal","sequence":"additional","affiliation":[{"name":"Telecommunications Section, CINVESTAV-IPN, Av. IPN 2508, San Pedro Zacatenco, Mexico City 07360, Mexico"}]},{"given":"Luis Alberto","family":"Vasquez-Toledo","sequence":"additional","affiliation":[{"name":"UAM-Iztapalapa, Electrical Department, Av. San Rafael Atlixco 186, Leyes de Reforma 1ra Secc, Iztapalapa, Mexico City 09340, Mexico"}]},{"given":"Arturo","family":"Rangel-Merino","sequence":"additional","affiliation":[{"name":"Instituto Polit\u00e9cnico Nacional, SEPI, ESIME-Zacatenco, Av. IPN S\/N, U.P. Adolfo Lopez Mateos, Mexico City 07738, Mexico"}]},{"given":"Rricardo","family":"Marcelin-Jimenez","sequence":"additional","affiliation":[{"name":"UAM-Iztapalapa, Electrical Department, Av. San Rafael Atlixco 186, Leyes de Reforma 1ra Secc, Iztapalapa, Mexico City 09340, Mexico"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1696-3349","authenticated-orcid":false,"given":"Enrique","family":"Rodriguez-Colina","sequence":"additional","affiliation":[{"name":"UAM-Iztapalapa, Electrical Department, Av. San Rafael Atlixco 186, Leyes de Reforma 1ra Secc, Iztapalapa, Mexico City 09340, Mexico"}]},{"given":"Michael","family":"Pascoe-Chalke","sequence":"additional","affiliation":[{"name":"UAM-Iztapalapa, Electrical Department, Av. San Rafael Atlixco 186, Leyes de Reforma 1ra Secc, Iztapalapa, Mexico City 09340, Mexico"}]}],"member":"1968","published-online":{"date-parts":[[2021,10,26]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"1045","DOI":"10.1109\/TAP.2007.893392","article-title":"Study of an Electrochemically-Deposited 3-D Random Fractal Tree-Monopole Antenna","volume":"55","author":"Rmili","year":"2007","journal-title":"IEEE Trans. Antennas Propag."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"662","DOI":"10.1109\/LAWP.2014.2376969","article-title":"Multiband Metamaterial-Loaded Monopole Antenna for WLAN\/WiMAX Applications","volume":"14","author":"Huang","year":"2015","journal-title":"IEEE Antennas Wirel. Propag. Lett."},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"4440","DOI":"10.1109\/TAP.2012.2207036","article-title":"Compact EBG for Multi-Band Applications","volume":"60","author":"Peng","year":"2012","journal-title":"IEEE Trans. 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