Octagonal complementary split ring resonator on rectangular patch MIMO antenna for terahertz applications

Abstract

A novel micro-sized inset-fed rectangular MIMO patch (IRMP) antenna with an octagonal complementary split ring resonator and defected ground structure is proposed for wide-band terahertz (THz) applications. The spatial and pattern diversity configurations consist of two identical radiating elements positioned adjacent to and orthogonal to each other. For both configurations, it exhibits an impedance bandwidth of 1.3 THz (S11 < −10 dB) spanning from 3.2 THz to 4.5 THz. The IRMP antenna has an isolation of S12 < −20 dB for both configurations. The overall dimensions of the two configurations are 200 × 400 × 20 µm3. The gain of the spatial diversity configuration is 8.9 dBi, 9.7 dBi, and 10.4 dBi. Similarly, the gain of pattern diversity configuration is 6.07 dBi, 7.54 dBi, and 10.2 dBi at 3.52 THz, 3.90 THz, and 4.26 THz, respectively. The MIMO performance parameters of both configurations are envelope correlation coefficient < 0.001, diversity gain > 9.995, channel capacity loss < 0.005 bits/sec/Hz, and mean effective gain between −6 dB and −8 dB within the band, which is acceptable.