Design of Dual-Band Self-Decoupled MIMO Antennas Based on Orthogonal Patterns

Abstract

A dual-band self-decoupled two-element MIMO antenna design based on orthogonal radiation patterns is presented. Through careful tuning of the antenna dimension, the maximum radiation directions of two antennas are adjusted to be orthogonal with each other naturally in both the two bands, resulting in eventual dual-band high isolation. Compared to the traditional dual-band MIMO antennas, the proposed method does not require any external decoupling structure. To validate the proposed method, two pairs of dual-band printed dipole antennas, working in the 3.5 GHz and 4.9 GHz band as well as 3.5 GHz and 5.8 GHz, are designed. The simulated results show that the proposed self-decoupled antennas achieve high isolation of better than 20 dB with matching conditions better than -10 dB.