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Designing Uncorrelated Multiple antennas with Round Patterns Using Handset Metal Frames

Chinese Journal of Electronics 2022年第6期31卷 1173-1180页

作者： LI Hui XU Jialu DIAO Yunze ZHOU Changfei School of Information and Communication Engineering Dalian University of Technology Research Institute of Electrical Communication Tohoku University

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 reliable 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 advantage of the ground clearance and exciting modes with different phases. Low correlations of below 0.07 are obtained. The antenna system is fabricated, with the measured results agreeing well with the simulated ones.

关键词： intact ground plane total pattern eight-port antenna system ultra-thin metal frames antenna arrays antenna radiation patterns mobile handsets exciting modes gain variations characteristic modes mobile antennas handset metal frames dominant planes reliable links uncorrelated multiple antennas design ground clearance mobile chassis uhf antennas four-antenna system

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High-Order Characteristic Modes Suppression for Cross-Band Decoupling in Shared-Aperture Antenna Array

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Chinese Journal of Electronics 2022年第6期31卷 1121-1128页

作者： LU Xiaochi CHEN Yikai SHEN Tongsheng GUO Shaojun ZOU Chunrong YANG Shiwen School of Electronic Science and Engineering University of Electronic Science and Technology of China National Innovation Institute of Defense Technology Academy of Military Sciences PLA China

In dual-band shared-aperture base station antennas, the secondary radiation(SR) field caused by cross-band couplings always leads to radiation pattern distortion. In this work, the SR field caused by the coupling is attributed to the excitation of the target highorder modes from the perspective of the characteristic mode. To effectively suppress the target modes, L-shaped slots are proposed to load the arms of the radiator and altering the current paths. As compared with conventional dipoles without L-shaped slots, the proposed antenna generates less SR field. Therefore, the radiation pattern of the high-band antennas keeps stable in a dual-band shared-aperture antenna array environment. Prototype of a dual-band antenna array consisting of the proposed lowband(LB) antenna and a 4 × 4 high-band(HB) antenna array is fabricated. Simulated and measured results show that the designed dual-band array operates at both 0.74–0.82 GHz and 3.30–3.80 GHz. The experimental results verify that the cross-band decoupling has been achieved with the high-order mode suppression.

关键词： slot antenna arrays cross-band couplings radiation pattern distortion L-shaped slots secondary radiation field target modes 4 × 4 high-band antenna array low-band antenna dual-band shared-aperture base station antennas dual-band shared-aperture antenna array environment antenna radiation patterns dual-band array SR field high-order mode suppression aperture antennas multifrequency antennas cross-band decoupling target high-order modes high-order characteristic modes suppression uhf antennas

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