Self-Decoupled Patch Antenna Based on Weak-Field for MIMO Application

This paper introduces a self-decoupled patch antenna based on weak-field distribution for multi-input-multi-output (MIMO) applications. The mutual coupling effect between the antenna elements can be attenuated by placing two short-circuited microstrip lines with vias between the two radiating elements. Due to the presence of weak fields, the decoupling of the E-plane array can be effectively achieved, and the isolation between patches is improved. The isolation of the proposed <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$1\times 2$</tex> antenna elements in operating frequency band is more than <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$-22\text{ dB}$</tex>. The distance between the two patches is <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$0.19\lambda_{0}$</tex> (where <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$\lambda_{0}$</tex> is the center frequency wavelength in free space).