{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,25]],"date-time":"2026-03-25T20:01:59Z","timestamp":1774468919811,"version":"3.50.1"},"reference-count":39,"publisher":"MDPI AG","issue":"22","license":[{"start":{"date-parts":[[2022,11,18]],"date-time":"2022-11-18T00:00:00Z","timestamp":1668729600000},"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>In this study, a multiple-input multiple-output (MIMO) antenna for wide scanning is designed. By adding slits to the patches, each element is intended to strengthen the isolation between the radiating elements. The proposed high isolation and wide scanning antenna combine to achieve the desired phased-array antenna. The array has a main beam pointing to the desired scanning region and a minimum side lobe level (SLL) in the undesired direction. A compact and linear eight-element array with an interelement spacing of \u03bb\/2 is designed and analyzed for beam scanning in the E-plane. Considering the worst case, the proposed array has a very low mutual coupling of (S21 = \u221224 dB), and it realizes a gain of 9.3 dBi and an SLL of 11 dB at a scanning angle of 70\u2218. The antenna performance was studied in terms of the S-parameter, radiation patterns, beam-scanning performance, envelope correlation coefficient (ECC), diversity gain (DG), peak gain, and efficiency. A close agreement was observed between the simulated and measured results.<\/jats:p>","DOI":"10.3390\/s22228933","type":"journal-article","created":{"date-parts":[[2022,11,18]],"date-time":"2022-11-18T06:22:28Z","timestamp":1668752548000},"page":"8933","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":11,"title":["Compact Eight-Element MIMO Antenna with Reduced Mutual Coupling and Beam-Scanning Performance"],"prefix":"10.3390","volume":"22","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-0966-9010","authenticated-orcid":false,"given":"Ashfaq","family":"Ahmad","sequence":"first","affiliation":[{"name":"Communication and Wave Propagation Laboratory, Department of Information and Communication Engineering, Chosun University, Gwangju 61452, Republic of Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0664-7908","authenticated-orcid":false,"given":"Dong-you","family":"Choi","sequence":"additional","affiliation":[{"name":"Communication and Wave Propagation Laboratory, Department of Information and Communication Engineering, Chosun University, Gwangju 61452, Republic of Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2022,11,18]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"267","DOI":"10.1109\/LAWP.2021.3127309","article-title":"Hybrid decoupling structure based on neutralization and partition schemes for compact large-scale base station arrays","volume":"21","author":"Liu","year":"2021","journal-title":"IEEE Antennas Wirel. Propag. Lett."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"203","DOI":"10.1109\/OJAP.2021.3057062","article-title":"Wide-band and wide-angle scanning phased array antenna for mobile communication system","volume":"2","author":"Yang","year":"2021","journal-title":"IEEE Open J. Antennas Propag."},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"5370","DOI":"10.1109\/TAP.2014.2343252","article-title":"Planar dual-band wide-scan phased array in X-band","volume":"62","author":"Valavan","year":"2014","journal-title":"IEEE Trans. Antennas Propag."},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"700","DOI":"10.1109\/LAWP.2020.2977730","article-title":"2-D wide-angle scanning phased array with hybrid patch mode technique","volume":"19","author":"Sun","year":"2020","journal-title":"IEEE Antennas Wirel. Propag. Lett."},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"63","DOI":"10.1109\/MCOM.2014.6894454","article-title":"Study and prototyping of practically large-scale mmWave antenna systems for 5G cellular devices","volume":"52","author":"Hong","year":"2014","journal-title":"IEEE Commun. Mag."},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"4840","DOI":"10.1109\/TAP.2011.2165497","article-title":"Millimeter-wave miniaturized substrate integrated multibeam antenna","volume":"59","author":"Cheng","year":"2011","journal-title":"IEEE Trans. Antennas Propag."},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"1129","DOI":"10.1109\/TAP.2014.2387418","article-title":"Comprehensive characterization of the double directional UWB residential indoor channel","volume":"63","author":"Pajusco","year":"2015","journal-title":"IEEE Trans. Antennas Propag."},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"2848","DOI":"10.1109\/TVT.2017.2774808","article-title":"Geometrical-based modeling for millimeter-wave MIMO mobile-to-mobile channels","volume":"67","author":"He","year":"2017","journal-title":"IEEE Trans. Veh. Technol."},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"24706","DOI":"10.1109\/ACCESS.2018.2830653","article-title":"A review of mutual coupling in MIMO systems","volume":"6","author":"Chen","year":"2018","journal-title":"IEEE Access"},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"563","DOI":"10.1109\/ACCESS.2018.2885558","article-title":"Study on mutual coupling reduction technique for MIMO antennas","volume":"7","author":"Nadeem","year":"2018","journal-title":"IEEE Access"},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"1317","DOI":"10.1109\/LAWP.2011.2176462","article-title":"High-efficiency periodic sparse patch array based on mutual coupling","volume":"10","author":"Qu","year":"2011","journal-title":"IEEE Antennas Wirel. Propag. Lett."},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"1045","DOI":"10.1109\/TAP.1985.1143501","article-title":"Analysis of finite phased arrays of printed dipoles","volume":"33","author":"Pozar","year":"1985","journal-title":"IEEE Trans. Antennas Propag."},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"1176","DOI":"10.1109\/8.310010","article-title":"The active element pattern","volume":"42","author":"Pozar","year":"1994","journal-title":"IEEE Trans. Antennas Propag."},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"1963","DOI":"10.1109\/TAP.2012.2235397","article-title":"High-efficiency periodic sparse microstrip array based on mutual coupling","volume":"61","author":"Qu","year":"2012","journal-title":"IEEE Trans. Antennas Propag."},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"480","DOI":"10.1109\/TWC.2002.800546","article-title":"Experimental study of mutual coupling compensation in smart antenna applications","volume":"1","author":"Dandekar","year":"2002","journal-title":"IEEE Trans. Wirel. Commun."},{"key":"ref_16","doi-asserted-by":"crossref","unstructured":"Habashi, A., Nourinia, J., and Ghobadi, C. (2012, January 15\u201317). A rectangular defected ground structure (DGS) for reduction of mutual coupling between closely-spaced microstrip antennas. Proceedings of the 20th Iranian Conference on Electrical Engineering (ICEE2012), Tehran, Iran.","DOI":"10.1109\/IranianCEE.2012.6292566"},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"876","DOI":"10.1109\/LAWP.2010.2074175","article-title":"Mutual coupling reduction between microstrip patch antennas using slotted-complementary split-ring resonators","volume":"9","author":"Siddiqui","year":"2010","journal-title":"IEEE Antennas Wirel. Propag. Lett."},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"862","DOI":"10.1109\/LAWP.2011.2165931","article-title":"Mutual coupling reduction between very closely spaced patch antennas using low-profile folded split-ring resonators (FSRRs)","volume":"10","author":"Habashi","year":"2011","journal-title":"IEEE Antennas Wirel. Propag. Lett."},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"135","DOI":"10.1109\/LAWP.2002.806757","article-title":"Isolation enhancement of anisotropic UC-PBG microstrip diplexer patch antenna","volume":"1","author":"Hao","year":"2002","journal-title":"IEEE Antennas Wirel. Propag. Lett."},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"2691","DOI":"10.1109\/TAP.2003.817559","article-title":"Reflection phase characterizations of the EBG ground plane for low profile wire antenna applications","volume":"51","author":"Yang","year":"2003","journal-title":"IEEE Trans. Antennas Propag."},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"1648","DOI":"10.1109\/TAP.2008.923306","article-title":"Mutual coupling reduction in patch antenna arrays by using a planar EBG structure and a multilayer dielectric substrate","volume":"56","year":"2008","journal-title":"IEEE Trans. Antennas Propag."},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"389","DOI":"10.1109\/LAWP.2012.2193111","article-title":"Reduction of mutual coupling between closely packed patch antennas using waveguided metamaterials","volume":"11","author":"Yang","year":"2012","journal-title":"IEEE Antennas Wirel. Propag. Lett."},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"15","DOI":"10.1109\/LAWP.2012.2237156","article-title":"Implementation of slotted meander-line resonators for isolation enhancement in microstrip patch antenna arrays","volume":"12","author":"Alsath","year":"2012","journal-title":"IEEE Antennas Wirel. Propag. Lett."},{"key":"ref_24","doi-asserted-by":"crossref","first-page":"1257","DOI":"10.1109\/LAWP.2016.2631621","article-title":"Reduction of mutual coupling between patch antennas using a polarization-conversion isolator","volume":"16","author":"Cheng","year":"2016","journal-title":"IEEE Antennas Wirel. Propag. Lett."},{"key":"ref_25","doi-asserted-by":"crossref","first-page":"166","DOI":"10.1109\/LAWP.2015.2435992","article-title":"Mutual coupling reduction for UWB MIMO antennas with a wideband neutralization line","volume":"15","author":"Zhang","year":"2015","journal-title":"IEEE Antennas Wirel. Propag. Lett."},{"key":"ref_26","first-page":"176","article-title":"Mutual coupling reduction of dual-band uni-planar MIMO system using neutralization line technique","volume":"35","author":"Saleh","year":"2020","journal-title":"Appl. Comput. Electromagn. Soc. J. (ACES)"},{"key":"ref_27","first-page":"411","article-title":"A low mutual coupling antenna array with gain enhancement using metamaterial loading and neutralization line structure","volume":"34","author":"Luo","year":"2019","journal-title":"Appl. Comput. Electromagn. Soc. J. (ACES)"},{"key":"ref_28","doi-asserted-by":"crossref","first-page":"2843","DOI":"10.1109\/TAP.2015.2421973","article-title":"A dual-band coupled resonator decoupling network for two coupled antennas","volume":"63","author":"Zhao","year":"2015","journal-title":"IEEE Trans. Antennas Propag."},{"key":"ref_29","doi-asserted-by":"crossref","first-page":"3608","DOI":"10.1038\/s41598-022-07579-5","article-title":"A compact two elements MIMO antenna for 5G communication","volume":"12","author":"Ahmad","year":"2022","journal-title":"Sci. Rep."},{"key":"ref_30","doi-asserted-by":"crossref","first-page":"38097","DOI":"10.1109\/ACCESS.2018.2853709","article-title":"A high-pass antenna interference cancellation chip for mutual coupling reduction of antennas in contiguous frequency bands","volume":"6","author":"Zhao","year":"2018","journal-title":"IEEE Access"},{"key":"ref_31","doi-asserted-by":"crossref","first-page":"561","DOI":"10.1002\/mop.20880","article-title":"Dual-band printed diversity antenna for 2.4\/5.2-GHz WLAN application","volume":"45","author":"Chi","year":"2005","journal-title":"Microw. Opt. Technol. Lett."},{"key":"ref_32","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1049\/el:20021188","article-title":"Printed diversity monopole antenna for WLAN operation","volume":"38","author":"Wu","year":"2002","journal-title":"Electron. Lett."},{"key":"ref_33","doi-asserted-by":"crossref","first-page":"2088","DOI":"10.1109\/TAP.2007.900249","article-title":"A novel dual-band printed diversity antenna for mobile terminals","volume":"55","author":"Ding","year":"2007","journal-title":"IEEE Trans. Antennas Propag."},{"key":"ref_34","doi-asserted-by":"crossref","first-page":"588","DOI":"10.1109\/LAWP.2008.2000664","article-title":"A compact wideband planar diversity antenna covering UMTS and 2.4 GHz WLAN bands","volume":"7","author":"Wang","year":"2008","journal-title":"IEEE Antennas Wirel. Propag. Lett."},{"key":"ref_35","doi-asserted-by":"crossref","first-page":"9","DOI":"10.1109\/LAWP.2004.825106","article-title":"Compact dual-printed inverted-F antenna diversity systems for portable wireless devices","volume":"3","author":"Karaboikis","year":"2004","journal-title":"IEEE Antennas Wirel. Propag. Lett."},{"key":"ref_36","unstructured":"Balanis, C.A. (2005). Antenna Theory, Analysis and Design, John Wiley & Sons. Inc. Publication. [3rd ed.]."},{"key":"ref_37","doi-asserted-by":"crossref","first-page":"310","DOI":"10.1109\/LAWP.2011.2140310","article-title":"Reducing mutual coupling of closely spaced microstrip MIMO antennas for WLAN application","volume":"10","author":"OuYang","year":"2011","journal-title":"IEEE Antennas Wirel. Propag. Lett."},{"key":"ref_38","doi-asserted-by":"crossref","first-page":"31376","DOI":"10.1109\/ACCESS.2019.2902951","article-title":"Characterizations of mutual coupling effects on switch-based phased array antennas for 5G millimeter-wave mobile communications","volume":"7","author":"Chen","year":"2019","journal-title":"IEEE Access"},{"key":"ref_39","doi-asserted-by":"crossref","first-page":"1017","DOI":"10.1109\/LAWP.2020.2986924","article-title":"Three-dimensional beamsteering low-complexity reconfigurable multilevel antenna","volume":"19","author":"Zhou","year":"2020","journal-title":"IEEE Antennas Wirel. Propag. Lett."}],"container-title":["Sensors"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/1424-8220\/22\/22\/8933\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,11]],"date-time":"2025-10-11T01:21:06Z","timestamp":1760145666000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/1424-8220\/22\/22\/8933"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2022,11,18]]},"references-count":39,"journal-issue":{"issue":"22","published-online":{"date-parts":[[2022,11]]}},"alternative-id":["s22228933"],"URL":"https:\/\/doi.org\/10.3390\/s22228933","relation":{},"ISSN":["1424-8220"],"issn-type":[{"value":"1424-8220","type":"electronic"}],"subject":[],"published":{"date-parts":[[2022,11,18]]}}}