▎ 摘　　要

Wireless data transmission has surged at an exponential rate and researchers are now looking at radio frequency bands that can accommodate these ever-increasing needs of cellular data users. Wireless infrastructure must be developed and utilized to meet the growing capacity and connectivity requirements. To fulfil the requirement of high-speed data transmission in wireless devices and applications, Terahertz (THz) frequency range (0.1-10) THz is considered to be the crucial step and has aroused the curiosity of the research community. Antennas are the critical part of any THz communication system and require a great deal of expertise for the designing part. The design and construction of a miniaturized THz antenna employing a complementary split ring and a modified ground structure are given in this article. The planned antenna comprises a complementary split ring formed by two slots etched on a patch, one substrate layer, and a common ground plane that is changed to achieve the appropriate resonance frequency. The designed multi-input multi-output (MIMO) antenna shows a wide fractional bandwidth of 85.81% from 2.5 to 11 THz by making exhibits a wide impedance bandwidth of 85.81% (2.5-11 THz) due to the derived changes in the MIMO configuration. The proposed design has a maximum gain of 49 decibels. The developed MIMO antenna is effective for Wireless Body Area Network (WBAN) applications, health care, aerospace, and biomedical imaging in the THz frequency range because of better gain, wider bandwidth, and good isolation.