Wearable Quarter-Wave Folded Microstrip Antenna for Passive UHF RFID Applications

被引：53

作者：

Kaufmann, Thomas ^{[1
,2
]}

Ranasinghe, Damith C. ^{[2
]}

Zhou, Ming ^{[2
]}

Fumeaux, Christophe ^{[1
]}

机构：

[1] Univ Adelaide, Sch Elect & Elect Engn, Adelaide, SA 5005, Australia

[2] Univ Adelaide, Auto ID Lab, Adelaide, SA 5005, Australia

来源：

INTERNATIONAL JOURNAL OF ANTENNAS AND PROPAGATION | 2013年 / 2013卷

基金：

澳大利亚研究理事会;

关键词：

DESIGN;

D O I：

10.1155/2013/129839

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 wearable low-profile inset-fed quarter-wave folded microstrip patch antenna for noninvasive activity monitoring of elderly is presented. The proposed antenna is embedded with a sensor-enabled passive radio-frequency identification (RFID) tag operating in the ultra-high frequency (UHF) industrial-scientific-medical (ISM) band around 900MHz. The device exhibits a low and narrow profile based on a planar folded quarter-wave length patch structure and is integrated on a flexible substrate to maximise comfort to the wearer. An extended ground plane made from silver fabric successfully minimises the impact of the human body on the antenna performance. Measurements on a prototype demonstrate a reflection coefficient (S-11) of -30 dB at resonance and a -10 dB bandwidth from 920MHz to 926MHz. Simulation results predict a maximum gain of 2.8 dBi. This is confirmed by tag measurements where a 4-meter read range is achieved using a transmit power of 30 dBm, for the case where the passive wearable tag antenna is mounted on a body in a practical setting. This represents an almost 40% increase in read range over an existing dipole antenna placed over a 10mm isolator layer on a human subject.

引用

页数：11

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