作者:Liu, Li; Cheung, S. W.; Yuk, T. I. 刊名:IEEE Transactions on Antennas and Propagation 上传者:姚永明

【摘要】A compact multiple-input-multiple-output (MIMO) antenna with a small size of 26 x 40 mm(2) is proposed for portable ultrawideband (UWB) applications. The antenna consists of two planar-monopole (PM) antenna elements with microstrip-fed printed on one side of the substrate and placed perpendicularly to each other to achieve good isolation. To enhance isolation and increase impedance bandwidth, two long protruding ground stubs are added to the ground plane on the other side and a short ground strip is used to connect the ground planes of the two PMs together to form a common ground. Simulation and measurement are used to study the antenna performance in terms of reflection coefficients at the two input ports, coupling between the two input ports, radiation pattern, realized peak gain, efficiency and envelope correlation coefficient for pattern diversity. Results show that the MIMO antenna has an impedance bandwidth of larger than 3.1-10.6 GHz, low mutual coupling of less than -15 dB, and a low envelope correlation coefficient of less than 0.2 across the frequency band, making it a good candidate for portable UWB applications.

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IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION, VOL. 61, NO. 8, AUGUST 2013 4257 Compact MIMO Antenna for Portable Devices in UWB Applications Li Liu, S. W. Cheung, Senior Member, IEEE, and T. I. Yuk Abstract—A compact multiple-input-multiple-output (MIMO) transmit or receive signals with different fading characteristics. antenna with a small size of mm is proposed for portable Since it is unlikely that all the received signals will experi- ultrawideband (UWB) applications. The antenna consists of two ence deep fading at the same time, the system reliability can planar-monopole (PM) antenna elements with microstrip-fed printed on one side of the substrate and placed perpendicularly be increased by proper selection/combining of the received to each other to achieve good isolation. To enhance isolation and signals. However, installing multiple antenna elements on the increase impedance bandwidth, two long protruding ground stubs small space available in portable devices will inevitably cause are added to the ground plane on the other side and a short severe mutual coupling and significantly degrade the diversity ground strip is used to connect the ground planes of the two PMs performance. Thus, one of the main challenges to employ together to form a common ground. Simulation and measurement are used to study the antenna performance in terms of reflection MIMO technology in portable devices is the design of the small coefficients at the two input ports, coupling between the two M

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