Abstract
The method of mode analysis has been proposed to decouple MIMO antennas in recent mobile terminals. It suggests a mobile MIMO antenna might achieve the isolation enhancement characteristic by exciting orthogonal characteristic modes. Based on this method, we has developed a novel method of decoupling antenna elements with high-order modes of ground plane in mobile MIMO terminals. In a mobile MIMO device, an antenna element usually excites a high-order mode of field distribution in the ground plane. The E-field or H-field of the excited high-order mode forms several stable null-amplitude field points locating on the edge of the ground plane. Then we can place other antenna elements in the proper null points. By doing this, the antenna elements are decoupled with high isolations. To demonstrate the effectiveness of the proposed method, we present a three-port MIMO antenna with isolation enhancement property based on the analysis of mode distributions on ground plane for mobile terminals. The results show the tri-port MIMO antenna has peak isolations up to around 50 dB, which verifies a multi-port mobile MIMO antenna might achieve isolation enhancement property by merely choosing the proposed method without any additional decoupling element.
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