{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,12,18]],"date-time":"2025-12-18T09:18:54Z","timestamp":1766049534918,"version":"build-2065373602"},"reference-count":25,"publisher":"MDPI AG","issue":"2","license":[{"start":{"date-parts":[[2021,1,9]],"date-time":"2021-01-09T00:00:00Z","timestamp":1610150400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/100014440","name":"Ministerio de Ciencia, Innovaci\u00f3n y Universidades","doi-asserted-by":"publisher","award":["TEC2017-86619-R"],"award-info":[{"award-number":["TEC2017-86619-R"]}],"id":[{"id":"10.13039\/100014440","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/100011941","name":"Gobierno del Principado de Asturias","doi-asserted-by":"publisher","award":["GRUPIN-IDI\/2018\/000191"],"award-info":[{"award-number":["GRUPIN-IDI\/2018\/000191"]}],"id":[{"id":"10.13039\/100011941","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>A transmitarray antenna is evaluated to generate a multi-focusing spot area in the Fresnel region of the antenna in the Ka-band. The antenna is designed to focus the radiated field at a certain point using a central feeding configuration. The number of feeds is increased to create as many focusing spots as feeds. The feeds are placed along an arc defined in the principal planes of the transmitarray, radiating independent near-field spots and providing a solution with a wide-angle spot scanning without an antenna displacement and a high isolation between feeds. To validate this concept, a transmitarray based on dielectric-only cells is designed and simulated under full-wave conditions. Then, this design is manufactured using a 3D printing technique, and the prototype is measured in a planar acquisition range. Measurements are performed for different feed positions in order to validate the multi-focusing capability of the antenna. Measurements and simulations show a high agreement and validate the proposed design technique.<\/jats:p>","DOI":"10.3390\/s21020422","type":"journal-article","created":{"date-parts":[[2021,1,10]],"date-time":"2021-01-10T23:03:42Z","timestamp":1610319822000},"page":"422","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":7,"title":["Evaluation of a Dielectric-Only Transmitarray for Generating Multi-Focusing Near-Field Spots Using a Cluster of Feeds in the Ka-Band"],"prefix":"10.3390","volume":"21","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-7317-4122","authenticated-orcid":false,"given":"\u00c1lvaro F.","family":"Vaquero","sequence":"first","affiliation":[{"name":"Group of Signal Theory and Communications, University of Oviedo, 33203 Gij\u00f3n, Spain"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7468-3084","authenticated-orcid":false,"given":"Marcos Rodr\u00edguez","family":"Pino","sequence":"additional","affiliation":[{"name":"Group of Signal Theory and Communications, University of Oviedo, 33203 Gij\u00f3n, Spain"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2487-121X","authenticated-orcid":false,"given":"Manuel","family":"Arrebola","sequence":"additional","affiliation":[{"name":"Group of Signal Theory and Communications, University of Oviedo, 33203 Gij\u00f3n, Spain"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4398-157X","authenticated-orcid":false,"given":"S\u00e9rgio A.","family":"Matos","sequence":"additional","affiliation":[{"name":"Departamento de Ci\u00eancias e Tecnologias da Informa\u00e7\u00e3o, Universit\u00e1rio de Lisboa (ISCTE-IUL), 1649-026 Lisbon, Portugal"},{"name":"Instituto de Telecomunica\u00e7\u00f5es, Instituto Superior T\u00e9cnico, Universidade de Lisboa, 1049-001 Lisbon, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1879-0026","authenticated-orcid":false,"given":"Jorge R.","family":"Costa","sequence":"additional","affiliation":[{"name":"Departamento de Ci\u00eancias e Tecnologias da Informa\u00e7\u00e3o, Universit\u00e1rio de Lisboa (ISCTE-IUL), 1649-026 Lisbon, Portugal"},{"name":"Instituto de Telecomunica\u00e7\u00f5es, Instituto Superior T\u00e9cnico, Universidade de Lisboa, 1049-001 Lisbon, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5332-842X","authenticated-orcid":false,"given":"Carlos A.","family":"Fernandes","sequence":"additional","affiliation":[{"name":"Instituto de Telecomunica\u00e7\u00f5es, Instituto Superior T\u00e9cnico, Universidade de Lisboa, 1049-001 Lisbon, Portugal"}]}],"member":"1968","published-online":{"date-parts":[[2021,1,9]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"1013","DOI":"10.1109\/TAP.2010.2103030","article-title":"Design of a Near-Field Focused Reflectarray Antenna for 2.4 GHz RFID Reader Applications","volume":"59","author":"Chou","year":"2011","journal-title":"IEEE Trans. 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