A Compact Decoupling Structure Applied in MIMO Antennas for Wideband Radar Applications

Abstract

In this paper, a novel decoupling structure is proposed to depress mutual coupling among closely-spaced elements of MIMO antenna, for the distance of 0.1457 lamda. Basing on gradient line, the proposed design has reduced mutual coupling in a wide range of frequency, for over 800MHz around 9.5GHz, the conventional operating frequency of radar application. The proposed structure was analyzed using equivalent circuit and applied in MIMO and array antenna designs to reduce mutual coupling and distortion of radiation pattern. The measured results were also presented and are agreed well with simulated ones.