A compact high isolation ultrawideband (UWB) multiple-input-multiple-output (MIMO) antenna is designed. The proposed\nMIMO antenna consists of a rectangular monopole antenna and a slot antenna fed by two microstrip lines, respectively. To\nimprove the impedance matching, a circular coupling structure is designed to feed the tapered slot antenna. The parasitic\nresonance introduced by the ground stub helps to extend the impedance bandwidth of monopole antenna at the upper UWB\nband. Commonly used complex decoupling or coupling structures are eliminated that endow the proposed antenna minimized\nfoot print, which is preferred in mobile handset. Although without decoupling structure, high isolation is obtained between two\nantenna elements. Simulation and measurement verify the antennaââ?¬â?¢s desirable performance, showing a broad impedance\nbandwidth of 3.1ââ?¬â??10.6 GHz with |S11| < âË?â??10 dB and |S21| < âË?â??20 dB over 3.4ââ?¬â??10.6 GHz, and |S21| < âË?â??18 dB from 3.1ââ?¬â??3.4 GHz.
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