Abstract
A novel compact multiple-input-multiple-output (MIMO) antenna for portable ul-trawideband (UWB) applications is presented. This antenna consists of two modified planar-monopole antenna elements with coplanar waveguides-fed printed on one side of the substrate. To enhance isolation and increase impedance bandwidth, a tree like stubs is placed on the ground plane at the 45° axis. The measured results show that the MIMO antenna operates from 2.3 GHz to 13 GHz, covering WLAN, WiMAX, and UWB. The low mutual coupling and low envelope correlation coefficient of less than 0.2 across the whole frequency band proved that this antenna was suitable for MIMO/diversity systems. Also, good performance of radiation patterns and the antenna’s compact size make it a good candidate for portable devices.
Highlights
Since the Federal Communications Commission (FCC) in the US opened the permit of 3.1 - 10.6 GHz spectrum for applications with low power emission in 2002 [1], ultrawideband (UWB) became a rapidly growing technology
To enhance isolation and increase impedance bandwidth, a tree like stubs is placed on the ground plane at the 45 ̊ axis
The low mutual coupling and low envelope correlation coefficient of less than 0.2 across the whole frequency band proved that this antenna was suitable for MIMO/diversity systems
Summary
National Key Laboratory of High Power Vacuum Electronics, CPE of UESTC, Chengdu, China.
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