volume | PIER Journals

2017-12-08

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

Jingming Zheng,

Dr. Jingming Zheng

College of Electronic and Information Engineering

Nanjing University of Aeronautics and Astronautics (NUAA)

China

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Yang Yang,

Dr. Yang Yang

Nanjing University of Aeronautics and Astronautics

China

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Xiaoxiang He,

Dr. Xiaoxiang He

Nanjing University of Aeronautics and Astronautics

China

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Chen-Yang Mao

Dr. Chen-Yang Mao

Nanjing University of Aeronautics and Astronautics

China

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Progress In Electromagnetics Research Letters, Vol. 72, 61-67, 2018

doi:10.2528/PIERL17102903

Abstract

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˚ in xoz-plane and 102˚ in yoz-plane, which can be used to scan for large regions. An 88 × 88 × 1.6 mm³ 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 1 m for large reading region of 170 × 170 mm².

Citation

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Jingming Zheng, Yang Yang, Xiaoxiang He, and Chen-Yang Mao, "A CP Antenna of Wide Half-Power Beamwidth for UHF RFID Near- and Far-Field Applications," Progress In Electromagnetics Research Letters, Vol. 72, 61-67, 2018.
doi:10.2528/PIERL17102903

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