A CP Antenna of Wide Half-Power Beamwidth for UHF RFID Near- and Far-Field Applications

被引：2
|
作者：
Zheng, Jingming [1 ]
Yang, Yang [1 ]
He, Xiaoxiang [1 ]
Mao, Chenyang [1 ]
机构：
[1] Nanjing Univ Aeronaut & Astronaut, Coll Elect & Informat Engn, Nanjing 210016, Jiangsu, Peoples R China
来源：
PROGRESS IN ELECTROMAGNETICS RESEARCH LETTERS | 2018年 / 72卷
关键词：
D O I：
10.2528/PIERL17102903
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
A wide half-power beamwidth antenna based on magnetic coupling in near-field (NF) regions and circular polarization (CP) in far-field (FF) is proposed for RFID multiservice applications in UHF band. The prototype consists of a cross-strip and an L-shaped strip on the top layer, fed by an F-shaped network on the bottom layer. CP electromagnetic wave is radiated by the cross-strip, and the antenna also simultaneously brings opposite directed currents (ODC) to generate strong magnetic field in near-field region. Half-power beamwidth is 100 degrees in xoz-plane and 102 degrees in yoz-plane, which can be used to scan for large regions. An 88x88x1.6 mm(3) antenna has been fabricated on an FR-4 substrate to fit RFID applications. Measured tests on read range by observing feedback received signal strength indication (RSSI) values are carried out, exhibiting 100% read rate for near-field tags within 25 mm and exciting read distance for far-field tags up to 1m for large reading region of 170 x 170 mm(2).
引用
收藏
页码：61 / 67
页数：7
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