A compact multi band MIMO antenna

This paper presents a compact dual band two element MIMO array covering the 2.4GHz and 5.2GHz bands for the modern mobile wireless LAN applications. The dual band antenna element is structured as a two-branch tree-type inverted-L monopole, where, the two collinear inverted-L radiators have been purposely organized such that an oblique element radiation pattern is obtainable. The MIMO array is then incorporated with two tree-type monopoles and a simple narrow band isolator to achieve an excellent mutual coupling performance. Besides, the characteristics of small size and nearly omnidirectional array radiation pattern make the proposed MIMO array entirely compatible with the mobile wireless network applications. The measurement results of the prototype antenna array demonstrate the success of the suggested design topology.