![]() ![]() The researchers can use the THz frequency bands in imaging, biomedical applications, and high data rates wireless applications (Gong et al. By moving the frequency band from the lower band to the THz band, the higher data rate and system capacity can be increased (Dash et al. Therefore, the terahertz spectrum extending from 0.1 to 10 THz can be utilized and developed (Akyildiz et al. Recently, the future 6th generation (6G) applications need more specifications in wireless communication systems which cannot be achieved using the existing microwave and millimeter spectrum. Finally, the MIMO parameters outcomes achieved good values which suggested the antenna to be employed in IoT THz applications. The MIMO antenna is operated from 3.2 to 4.45 THz with S 11 ≤ − 10 dB, isolation ˃ 20, gain from 8 to 10.8 dB, and efficiency higher than 80%. The antenna gain is increased from 6 dB (single antenna without FSS) to 10.8 dB (with FSS) at 3.4 THz. The FSS is inserted below the MIMO antenna to reflect the antenna radiation and then enhance the antenna gain. The FSS performance is investigated and optimized using a finite integral technique (FIT) software to achieve a reflective feature with band rejection from 2 up to 5 THz within the operating bands of the suggested antenna. As well, to enhance the antenna gain, frequency selective surfaces (FSS) with a metallic patch are utilized to enhance the antenna gain. The reconfigurability is validated by changing the external DC Volt which in turn changes the graphene chemical potential and then changes the operating frequency. The single antenna is composed of an antipodal Vivaldi antenna with a graphene radiator on the top and copper ground plane on the back with a total size equal to 108 µm × 84 µm to achieve reconfigurable performance from 3 to 4.5 THz. ![]() A graphene-based two ports antipodal Vivaldi antenna with improved gain for THz applications is introduced. ![]()
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