Circuit‐Theoretic Modeling and Simulation Study of Near‐Field MIMO Arrays of Dipole Antennas

Near‐field mutual coupling among closely spaced antennas limits the deployment of wireless MIMO interconnects in chip‐to‐chip communication. This paper presents a circuit‐theoretic modeling and simulation study of near‐field MIMO (NFMIMO) systems using 1 × 1 and 2 × 2 dipole arrays. Simulations were performed using Altair Feko V2021.1 over the 24–36 GHz frequency range. Self and mutual impedances were computed, and S‐parameter expressions were derived from the electric and magnetic field components. The effect of varying interelement spacing on return loss and coupling efficiency was analyzed. Optimal spacings of D = 0.2 λ and D = 0.4 λ at 26.89 GHz and 30.45 GHz, respectively, resulted in improved impedance matching and enhanced power transfer. A shift in S 11 resonance with element spacing was observed, highlighting the critical role of antenna placement in NFMIMO performance.