A simple and modular MIMO antenna system for closely spaced patch antennas

Abstract

AbstractA simple, low cost and modular decoupling technique is proposed to achieve high isolation between very close antenna elements of a multiple‐input‐multiple‐output (MIMO) system without any complex decoupling structure, vias, or defected ground structure (DGS). A rectangular thin parasitic strip is used to decouple square patch elements, which are separated by an extremely close distance of at GHz. The proposed technique has achieved more than dB isolation between MIMO antenna elements with a minimum return loss of dB. A straightforward three‐step method is also proposed to shift the resonance frequency to some other frequency with similar isolation and impedance matching. All the important characteristics and performance parameters of the proposed design technique are analyzed, simulated, and verified through the measurement of the fabricated prototype.