Multiple antennas with low correlations are highly in demand in the mobile handsets for higher data rate.At the same time,the total pattern provided by the antennas should be as round as possible for reli-able links.In this paper,by analysing the characteristic modes of the mobile chassis loaded by ultra-thin metal frames,a four-antenna system with a round total pattern is designed at 2.4 GHz.The gain variations are only 3.4 dB and 3.6 dB on two dominant planes.The isolations between antennas are above 15 dB,and the correlations are below 0.01,with intact ground plane and small ground clearance of 2 mm maintained.Afterwards,an eight-port antenna system is designed by taking advant-age of the ground clearance and exciting modes with dif-ferent phases.Low correlations of below 0.07 are ob-tained.The antenna system is fabricated,with the meas-ured results agreeing well with the simulated ones.

LI Hui;XU Jialu;DIAO Yunze;ZHOU Changfei

School of Information and Communication Engineering,Dalian University of Technology,Dalian 116024,China;Research Institute of Electrical Communication,Tohoku University,Sendai 980-8577,Japan

电子学报（英文）

[1]LI Hui;XU Jialu;DIAO Yunze;ZHOU Changfei-.Designing Uncorrelated Multiple Antennas with Round Patterns Using Handset Metal Frames)[J].电子学报（英文）,2022(06):1173-1180

Uncorrelated,Handset,handsets,isolations

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