Abstract
A compact UWB (Ultrawideband) MIMO (Multiple-input multiple-output) antenna with asymmetric coplanar strip (ACS)-fed structure is proposed in this paper. The antenna consists of two modifled ACS feeding staircase-shaped radiation elements which are orthogonally placed, and the wideband isolation is achieved through a fence-like stub between them. The efiectiveness of the fence- like stub is analyzed. Measured results show that the presented antenna can achieve a broad impedance bandwidth (jS11j 6 i10dB) of 3.1{11GHz with good performance in terms of isolation > 15dB. Radiation patterns and correlation coe-cient (ECC) denote the consistent diversity performance across the entire UWB bandwidth. By introducing the ACS-fed structure, the antenna size can be considerably reduced to 43:5mm £ 43:5mm £ 1:6mm compared to the recently published UWB MIMO antennas, which makes the antenna suitable for portable UWB MIMO applications.
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