Chen Shu-Chuan, Wu Chang-Sheng, Cheng Shao-Hung, Lin Chih-Chung
Electrical and Electronic Engineering Department, Chung Cheng Institute of Technology, National Defense University, Taoyuan 335, Taiwan.
Micromachines (Basel). 2023 Mar 9;14(3):626. doi: 10.3390/mi14030626.
A sub 6 GHz dual-band closed-slot multiantenna system for 5G laptops is proposed in this paper. It was installed in a clearance space, with dimensions og 217 × 3 mm and 1 mm away from the upper edge of the screen ground plane. The dimensions of the clearance space were the same as those of a multisystem consisting of six antennas. The dimensions of the single closed-slot antenna were 32 × 3 mm (0.368 λ × 0.034 λ, where λ equals the free-space wavelength of 3450 MHz. The antenna was coupled to an asymmetric T-shaped feed-in section equipped with a chip capacitor for exciting one-half and full wavelength resonance modes of the closed-slot to encompass sub 6 GHz 3300-3600 MHz and 4800-5000 MHz dual-band operations. The design of the antenna features a long and straight slot to generate the high-order mode of the closed slot in the high-frequency (4800-5000 MHz) band (not the low-frequency (3300-3600 MHz) multiplier band). Its structure is simple, and the width of its slot is only 3 mm. The antennas were arranged to be 5 mm apart in the same direction and in parallel to form a six-antenna system in order to utilize the weak electric fields located at the two closed ends of the closed-slot structure when the closed slot was excited. It showed excellent envelope correlation coefficients (ECCs) and isolation performance without the installation of isolation elements. The measured fractional bandwidth of the antenna was 10.15% and 6.73% at the center frequencies of 3450 MHz and 4900 MHz, respectively. Its measured isolation was always over 10 dB, and the efficiency was between 46% and 76%. The ECCs of the system calculated from the measured complex E-field radiation pattern were all below 0.2, which means that it is ideal for use in laptop devices with a high screen-to-body ratio and a metal back cover.
本文提出了一种用于5G笔记本电脑的低于6GHz双频段闭槽多天线系统。它安装在一个净空空间中，尺寸为217×3mm，距离屏幕接地平面上边缘1mm。净空空间的尺寸与由六个天线组成的多系统的尺寸相同。单个闭槽天线的尺寸为32×3mm（0.368λ×0.034λ，其中λ等于3450MHz的自由空间波长）。该天线耦合到一个配备有片式电容器的不对称T形馈入部分，用于激发闭槽的半波长和全波长谐振模式，以实现低于6GHz的3300 - 3600MHz和4800 - 5000MHz双频段操作。天线的设计具有一个长而直的槽，用于在高频（4800 - 5000MHz）频段（而非低频（3300 - 3600MHz）倍频频段）产生闭槽的高阶模式。其结构简单，槽宽仅为3mm。天线在同一方向上平行排列，间距为5mm，以形成一个六天线系统，以便在闭槽被激发时利用位于闭槽结构两个封闭端的弱电场。在未安装隔离元件的情况下，它表现出优异的包络相关系数（ECC）和隔离性能。天线在3450MHz和4900MHz中心频率处测得的分数带宽分别为10.15%和6.73%。其测得的隔离度始终超过10dB，效率在46%至76%之间。根据测得的复E场辐射方向图计算出的系统ECC均低于0.2，这意味着它非常适合用于具有高屏占比和金属后盖的笔记本电脑设备。
