NDLI: Compact 0.92/2.45-GH Dual-Band Directional Circularly Polarized Microstrip Antenna for Handheld RFID Reader Applications

Content Provider	IEEE Xplore Digital Library
Author	Qiang Liu Junyu Shen Jungang Yin Hongli Liu Yuanan Liu
Copyright Year	1963
Abstract	This paper presents a compact 0.92/2.45-GHz dual-band directional circularly polarized (CP) microstrip antenna for handheld radio-frequency identification (RFID) reader applications. The proposed antenna comprises a wideband dual-feed network and two stacked concentric patches assembled by two orthogonally placed vertical probes. The dual-feed network feeds quadrature signals across the RFID bands between 0.92 and 2.45 GHz. The two stacked concentric patches provide resonance frequencies in fundamental mode for lower band and higher band, respectively. Additionally, the antenna features only one connection port and same sense CP radiation at two bands, beneficial to cost and complexity reductions of the dual-band front end of RFID readers. The measurement results show the performances of return loss (RL) >10 dB, 3-dB gain variation, and axial ratio (AR) <;3 dB are achieved on the bands 0.911-0.933 GHz and 2.40- 2.57 GHz. The measured peak gains are 3.8 dBic at 0.926 GHz and 8.9 dBic at 2.48 GHz. In addition, the antenna provides symmetrical patterns with wide-angle half-power beamwidths and wide-angle 3-dB AR beamwidths. The size of the antenna 110 × 110 × 6.6 mm³ is much smaller than reported dual-band one port RFID directional CP reader antennas. The antenna appropriates to both ultra-high frequency (UHF) and industrial scientific and medical (ISM) bands in handheld RFID reader applications.
Sponsorship	IEEE Antennas and Propagation Society
Starting Page	3849
Ending Page	3856
Page Count	8
File Size	1288003
File Format	PDF
ISSN	0018926X
Volume Number	63
Issue Number	9
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2015-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Radiofrequency identification Dual band Ports (Computers) Substrates Microstrip antennas Directive antennas microstrip antenna Radio-frequency identification (RFID) compact dual-band circularly polarized (CP) directional radio-frequency identification (RFID) Circularly polarized (CP)
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electrical and Electronic Engineering

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