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The individual antenna element comprises a radiator shaped like the Chinese character \u201c\u738b\u201d (phonetically represented as \u201cWang\u201d) and three split-ring resonators (SRR) on the metal frame. The size of the individual antenna element is only 6.8 \u00d7 7 \u00d7 1 mm3 (47.6 mm3). The proposed antenna element has a \u221210 dB impedance bandwidth of 1.7 GHz (from 3.3 GHz to 5 GHz) that can cover 5G New Radio (NR) sub-6 GHz bands N77 (3.3\u20134.2 GHz), N78 (3.3\u20133.8 GHz), and N79 (4.4\u20135 GHz). The evolution design, the current distribution, the effects of single-handed holding, and the analysis of the parameters are deduced to study the approach used to design the featured antenna. The measured total efficiencies are from 40% to 80%, the isolation is better than 12 dB, the calculated envelope correlation coefficient (ECC) is less than 0.12, and the calculated channel capacity (CC) ranges from 35 to 38 bps\/Hz. The presented antenna array is a good alternative to 5G mobile handsets with wideband operation, a metal frame, and minimized spacing.<\/jats:p>","DOI":"10.3390\/s23249734","type":"journal-article","created":{"date-parts":[[2023,12,11]],"date-time":"2023-12-11T14:12:51Z","timestamp":1702303971000},"page":"9734","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["A Miniature Eight-Port Antenna Array Based on Split-Ring Resonators for 5G Sub-6 GHz Handset Applications"],"prefix":"10.3390","volume":"23","author":[{"given":"Jianlin","family":"Huang","sequence":"first","affiliation":[{"name":"College of Electrical and Electronic Engineering, Wenzhou University, Wenzhou 325035, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Lingrong","family":"Shen","sequence":"additional","affiliation":[{"name":"College of Electrical and Electronic Engineering, Wenzhou University, Wenzhou 325035, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Shanshan","family":"Xiao","sequence":"additional","affiliation":[{"name":"College of Electrical and Electronic Engineering, Wenzhou University, Wenzhou 325035, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Xiaojing","family":"Shi","sequence":"additional","affiliation":[{"name":"College of Electrical and Electronic Engineering, Wenzhou University, Wenzhou 325035, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5144-5614","authenticated-orcid":false,"given":"Gui","family":"Liu","sequence":"additional","affiliation":[{"name":"College of Electrical and Electronic Engineering, Wenzhou University, Wenzhou 325035, China"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2023,12,10]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"1477","DOI":"10.1049\/iet-map.2017.0654","article-title":"Four-feed reconfigurable MIMO antenna for metal-frame smartphone applications","volume":"12","author":"Zhang","year":"2018","journal-title":"IET Microw. 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