Mutual Coupling Reduction of Super Wide Band MIMO Antenna Using Metamaterial Periodic Defected Ground Structures for THz Applications

Abstract

In this article, a double negative (DNG) material inspired periodic defected ground structure is presented to reduce mutual coupling and gain enhancement of super wide band multiple input and multiple output antenna (SWBMA) for terahertz (THz) applications. For THz applications, a dual port super wide band MIMO antenna with size of 0.35 λ₀ ×0.17 λ₀ ×0.02 λ₀ (57 ×27.6 ×3.36 µm³) has been designed on quartz substrate. The simulated results of proposed antenna exhibit fractional bandwidth (FWB) of 164% at 9.9THz resonant frequency (1.75 to 18THz) with peak gain 9.2dBi, and average radiation efficiency 89% throughout the super wide band spectrum. By inserting DNG meta-material based periodic defected ground structures in between inverse L stubs on ground plane, an isolation S₁₂/S₂₁ between radiating elements of S_i,j ≤ -25dB has been attained. MIMO parameters of designed antenna are also investigated and it is observed that ECC<0.0025, DG>9.98 dB, TARC<-15dB, MEG<-3dB, and CCL<0.225bps/Hz throughout spectrum of antenna.By evaluating the characteristics of proposed antenna, it can be concluded that the proposed MIMO antenna can be a good candidate for high-speed THz applications like future 6G, high-speed Radar, and radiometric applications.