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Frontiers of Information Technology & Electronic Engineering >> 2023, Volume 24, Issue 11 doi: 10.1631/FITEE.2300203

A high-isolation coupled-fed building block for metal-rimmed 5G smartphones

Information Materials and Intelligent Sensing Laboratory of Anhui Province, Anhui University, Hefei 230601, China; Aviation Key Laboratory of Science and Technology on Electromagnetic Environmental Effects, Shenyang 110000, China; Science and Technology on Antenna and Microwave Laboratory, Xidian University, Xi'an 710071, China;

Received: 2023-03-23 Accepted: 2023-12-04 Available online: 2023-12-04

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A dual-antenna building block with high isolation is presented for metal-rimmed fifth-generation (5G) smartphones. A coupled-fed loop antenna and a coupledfed slot antenna based on a simple T-slot etched on the ground plane are meticulously designed to form a compact building block. Notably, although the coupledfed loop antenna and the coupled-fed slot antenna share the same aperture, a desirable isolation of >30 dB is exhibited. Afterward, an 8×8 multiple-input multipleoutput (MIMO) system is achieved by integrating four such dual-antenna building blocks. The measured mutual coupling and envelope correlation coefficients (ECCs) of the presented 8×8 MIMO system are <−18.5 dB and <0.02, respectively.

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