Decoupling of Dual-band Closely Spaced MIMO Antennas Based on Novel Coupled Resonator Structure

Abstract

Abstract A pair of dual-band closely spaced MIMO monopole antenna array working at WLAN 2.45/5.25GHz with a dual-band coupled resonator structure for decoupling is proposed, the edge-to-edge distance of which is 0.0735 ${^{\lambda _0}}$ at 2.45GHz and 0.1575 ${^{\lambda _0}}$ at 5.25GHz. Simulation and measurement on coupled antennas and decoupled antennas indicate that mutual coupling reductions of 24.52dB and 26.57dB at two frequencies are achieved. With good impedance matching, improved total efficiency and increased channel capacity, the proposed structure owns good applicability, compact size and effective decoupling capability, and is promising in the application of wireless terminal MIMO system.