Design and Characterization of Dual-Band Complementary Split-Ring Resonator Array in the D-Band for 6G Wireless Networks

The D-band frequency spectrum, ranging from 110 GHz to 170 GHz, is promising in achieving high throughput in the sixth-generation (6G) wireless networks. However, efficient and low-cost antenna array designs are limited in this sub-terahertz (THz) spectrum. In this work, a complementary split-ring resonator (CSRR) antenna array is designed and analyzed. First, a single CSRR element is designed and its working mechanism is analyzed. Second, based on the element design, an array design with 2×2 elements is presented. In particular, a T-junction power divider is utilized in the feeding network. Our simulation results demonstrate that good band isolation is achieved between two resonating frequencies of 127.2 GHz and 137.8 GHz. Our designed CSRR array demonstrates a maximum gain of 13.8 dBi and 14.8 dBi at two respective resonating frequency bands. This CSRR array design with a streamlined structure has the potential for effective integration within a compact RF system, such as the sub-THz reconfigurable intelligent surfaces.