Wearable Quarter-Wave Folded Microstrip Antenna for Passive UHF RFID Applications
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-s...
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| Format: | Article |
| Language: | English |
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Wiley
2013-01-01
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| Series: | International Journal of Antennas and Propagation |
| Online Access: | http://dx.doi.org/10.1155/2013/129839 |
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| _version_ | 1832554862587412480 |
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| author | Thomas Kaufmann Damith C. Ranasinghe Ming Zhou Christophe Fumeaux |
| author_facet | Thomas Kaufmann Damith C. Ranasinghe Ming Zhou Christophe Fumeaux |
| author_sort | Thomas Kaufmann |
| collection | DOAJ |
| description | 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 900 MHz. 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 (S11) of −30 dB at resonance and a −10 dB bandwidth from 920 MHz to 926 MHz. 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 10 mm isolator layer on a human subject. |
| format | Article |
| id | doaj-art-d1eca363ad154eba8c3f502131f66d0e |
| institution | Kabale University |
| issn | 1687-5869 1687-5877 |
| language | English |
| publishDate | 2013-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | International Journal of Antennas and Propagation |
| spelling | doaj-art-d1eca363ad154eba8c3f502131f66d0e2025-02-03T05:50:23ZengWileyInternational Journal of Antennas and Propagation1687-58691687-58772013-01-01201310.1155/2013/129839129839Wearable Quarter-Wave Folded Microstrip Antenna for Passive UHF RFID ApplicationsThomas Kaufmann0Damith C. Ranasinghe1Ming Zhou2Christophe Fumeaux3School of Electrical and Electronic Engineering, The University of Adelaide, Adelaide, SA 5005, AustraliaThe Auto-ID Laboratory, The University of Adelaide, Adelaide, SA 5005, AustraliaThe Auto-ID Laboratory, The University of Adelaide, Adelaide, SA 5005, AustraliaSchool of Electrical and Electronic Engineering, The University of Adelaide, Adelaide, SA 5005, AustraliaA 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 900 MHz. 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 (S11) of −30 dB at resonance and a −10 dB bandwidth from 920 MHz to 926 MHz. 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 10 mm isolator layer on a human subject.http://dx.doi.org/10.1155/2013/129839 |
| spellingShingle | Thomas Kaufmann Damith C. Ranasinghe Ming Zhou Christophe Fumeaux Wearable Quarter-Wave Folded Microstrip Antenna for Passive UHF RFID Applications International Journal of Antennas and Propagation |
| title | Wearable Quarter-Wave Folded Microstrip Antenna for Passive UHF RFID Applications |
| title_full | Wearable Quarter-Wave Folded Microstrip Antenna for Passive UHF RFID Applications |
| title_fullStr | Wearable Quarter-Wave Folded Microstrip Antenna for Passive UHF RFID Applications |
| title_full_unstemmed | Wearable Quarter-Wave Folded Microstrip Antenna for Passive UHF RFID Applications |
| title_short | Wearable Quarter-Wave Folded Microstrip Antenna for Passive UHF RFID Applications |
| title_sort | wearable quarter wave folded microstrip antenna for passive uhf rfid applications |
| url | http://dx.doi.org/10.1155/2013/129839 |
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