{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,14]],"date-time":"2026-04-14T16:09:39Z","timestamp":1776182979982,"version":"3.50.1"},"reference-count":36,"publisher":"MDPI AG","issue":"9","license":[{"start":{"date-parts":[[2020,4,29]],"date-time":"2020-04-29T00:00:00Z","timestamp":1588118400000},"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>A compact dual-frequency (    38 \/ 60 \u00a0 GHz    ) microstrip patch antenna with novel design is proposed for 5G mobile handsets to combine complicated radiation mechanisms for dual-band operation. The proposed antenna is composed of two electromagnetically coupled patches. The first patch is directly fed by a microstrip line and is mainly responsible for radiation in the lower band (    38 \u00a0 GHz    ). The second patch is fed through both capacitive and inductive coupling to the first patch and is mainly responsible for radiation in the upper frequency band (    60 \u00a0 GHz    ). Numerical and experimental results show good performance regarding return loss, bandwidth, radiation patterns, radiation efficiency, and gain. The impedance matching bandwidths achieved in the     38 \u00a0 GHz     and     60 \u00a0 GHz     bands are about     2 \u00a0 GHz     and     3.2 \u00a0 GHz    , respectively. The minimum value of the return loss is     \u2212 42     dB for the     38 \u00a0 GHz     band and     \u2212 47     for the     60 \u00a0 GHz     band. Radiation patterns are omnidirectional with a balloon-like shape for both bands, which makes the proposed single antenna an excellent candidate for a multiple-input multiple-output (MIMO) system constructed from a number of properly allocated elements for 5G mobile communications with excellent diversity schemes. Numerical comparisons show that the proposed antenna is superior to other published designs.<\/jats:p>","DOI":"10.3390\/s20092541","type":"journal-article","created":{"date-parts":[[2020,4,29]],"date-time":"2020-04-29T13:23:45Z","timestamp":1588166625000},"page":"2541","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":128,"title":["A Novel Dual-Band (38\/60 GHz) Patch Antenna for 5G Mobile Handsets"],"prefix":"10.3390","volume":"20","author":[{"given":"Marwa H.","family":"Sharaf","sequence":"first","affiliation":[{"name":"Electronics and Communications Department, College of Engineering and Technology, Arab Academy for Science, Technology &amp; Maritime Transport, Alexandria 21937, Egypt"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9438-8207","authenticated-orcid":false,"given":"Amira I.","family":"Zaki","sequence":"additional","affiliation":[{"name":"Electronics and Communications Department, College of Engineering and Technology, Arab Academy for Science, Technology &amp; Maritime Transport, Alexandria 21937, Egypt"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3495-1341","authenticated-orcid":false,"given":"Radwa K.","family":"Hamad","sequence":"additional","affiliation":[{"name":"Electronics and Communications Department, College of Engineering and Technology, Arab Academy for Science, Technology &amp; Maritime Transport, Alexandria 21937, Egypt"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4763-5164","authenticated-orcid":false,"given":"Mohamed M. M.","family":"Omar","sequence":"additional","affiliation":[{"name":"Electronics and Communications Department, College of Engineering and Technology, Arab Academy for Science, Technology &amp; Maritime Transport, Alexandria 21937, Egypt"}]}],"member":"1968","published-online":{"date-parts":[[2020,4,29]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"672","DOI":"10.1049\/iet-map.2017.0467","article-title":"Millimetre-wave T-shaped MIMO antenna with defected ground structures for 5G cellular networks","volume":"12","author":"Jilani","year":"2018","journal-title":"IET Microw. Antennas Propag."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"1286","DOI":"10.1109\/LAWP.2018.2842242","article-title":"Broadband proximity-coupled microstrip planar antenna array for 5G cellular applications","volume":"17","author":"Diawuo","year":"2018","journal-title":"IEEE Antennas Wirel. Propag. 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