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The four elements are placed orthogonally to one another to reduce mutual coupling and envelope correlation coefficient (ECC). The maximum isolation of the proposed MIMO antenna is 34\u00a0dB at 0.290\u00a0THz frequency. The diversity performance characteristics of the proposed antenna are studied in terms of ECC, diversity gain (DG), mean effective gain (MEG), total active reflection coefficient (TARC), and isolation between the ports, and the obtained values are 0.05, 9.9, 3, \u22125, \u221210, respectively. Each antenna has a peak gain of 4.4\u00a0dBi with an average radiation efficiency of 92.5%. The proposed MIMO antenna is designed on a Rogers RO4003 substrate having a dielectric constant of 3.55, and a loss tangent of 0.0027 with a dimension of \u00a0 m<jats:sup>3<\/jats:sup>. Further analyses of path loss in free space, atmospheric absorption, and roughness factor in indoor surfaces for THz communication are also studied. The designed MIMO antenna is suitable for high\u2010speed short distance communication, video\u2010rate imaging, biomedical imaging, sensing, and security scanning in the THz frequency band.<\/jats:p>","DOI":"10.1002\/cta.3473","type":"journal-article","created":{"date-parts":[[2022,10,24]],"date-time":"2022-10-24T08:29:59Z","timestamp":1666600199000},"page":"1460-1475","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":16,"title":["Analysis of path loss and channel capacity in quad element MIMO antenna for terahertz communication systems"],"prefix":"10.1002","volume":"51","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-7157-5520","authenticated-orcid":false,"given":"Ajit Kumar","family":"Singh","sequence":"first","affiliation":[{"name":"Department of Electronics and Communication Engineering Indian Institute of Information Technology Ranchi Jharkhand India"}]},{"given":"Santosh Kumar","family":"Mahto","sequence":"additional","affiliation":[{"name":"Department of Electronics and Communication Engineering Indian Institute of Information Technology Ranchi Jharkhand India"}]},{"given":"Praveen","family":"Kumar","sequence":"additional","affiliation":[{"name":"Department of Electronics and Communication Engineering National Institute of Technology Jamshedpur Jharkhand India"}]},{"given":"Rashmi","family":"Sinha","sequence":"additional","affiliation":[{"name":"Department of Electronics and Communication Engineering National Institute of Technology Jamshedpur Jharkhand India"}]}],"member":"311","published-online":{"date-parts":[[2022,10,24]]},"reference":[{"key":"e_1_2_10_2_1","doi-asserted-by":"publisher","DOI":"10.1002\/mop.32117"},{"key":"e_1_2_10_3_1","doi-asserted-by":"publisher","DOI":"10.1109\/JPROC.2012.2186214"},{"key":"e_1_2_10_4_1","doi-asserted-by":"publisher","DOI":"10.1109\/ACCESS.2013.2260813"},{"key":"e_1_2_10_5_1","doi-asserted-by":"publisher","DOI":"10.23919\/J.CC.2020.07.011"},{"key":"e_1_2_10_6_1","doi-asserted-by":"crossref","unstructured":"SinghR LehrW SickerD HuqKMS.Beyond 5g: The role of thz spectrum. 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