2009
DOI: 10.1002/mop.24894
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Two novel extremely low‐profile slot‐coupled two‐element patch antennas for UHF RFID of people

Abstract: Novel type of extremely low-profile low-dielectric constant substrate antenna, based on two-element slot-coupled shortedpatch structure for UHF RFID applications has been developed. We use two different methods for tuning the complex input impedance-dipole excitation and direct excitation with tuning slots. Both credit card-sized antennas exhibit the antenna efficiency better than $50%, irrespective of whether they are placed in free space or enclosed to either metallic or human body.

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Cited by 17 publications
(17 citation statements)
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“…Indeed, in the UHF RFID band, an effective shielding ground plane can still be small enough to allow antenna positioning on the wearer's torso/back or upper arm. For instance, in [109]- [113], a set of grounded printed antennas with one or two dielectric layers have been studied to realize RFID tags suitable for people identification in mass races and workplaces (in the sense that the tag must be suitable for integration on name-badges or runner number labels). A conventional halfwavelength rectangular patch (74mmx165mmx4.8mm) realized with a conductive fabric on a flexible and lightweight foam dielectric was able to give a 5dBi gain, when the antenna prototype was mounted on a body phantom [109].…”
Section: B Wearable Antennas For Uhf-rfid Transpondersmentioning
confidence: 99%
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“…Indeed, in the UHF RFID band, an effective shielding ground plane can still be small enough to allow antenna positioning on the wearer's torso/back or upper arm. For instance, in [109]- [113], a set of grounded printed antennas with one or two dielectric layers have been studied to realize RFID tags suitable for people identification in mass races and workplaces (in the sense that the tag must be suitable for integration on name-badges or runner number labels). A conventional halfwavelength rectangular patch (74mmx165mmx4.8mm) realized with a conductive fabric on a flexible and lightweight foam dielectric was able to give a 5dBi gain, when the antenna prototype was mounted on a body phantom [109].…”
Section: B Wearable Antennas For Uhf-rfid Transpondersmentioning
confidence: 99%
“…The four patches are printed on a 1.82mm-thick high permittivity dielectric (ε r =10), and the antenna size is 70mmx105mm (onphantom measured gain is 0.6dBi). To avoid using high permittivity dielectrics, a layout made of two slot-coupled shorted patches (namely, two quarter-wavelength patches separated by a gap and shorted to the ground at the opposite edges) that are excited by a meandered dipole has been proposed in [113]. The dipole is printed on a thin dielectric layer and placed on the patch top surface.…”
Section: B Wearable Antennas For Uhf-rfid Transpondersmentioning
confidence: 99%
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