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An EM‐coupled dual‐polarized microstrip patch antenna for RFID applications
Author(s) -
Padhi S. K.,
Karmakar N. C.,
Law C. L.
Publication year - 2003
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.11215
Subject(s) - beamwidth , microstrip antenna , optics , physics , patch antenna , dual polarization interferometry , microstrip , antenna measurement , antenna (radio) , engineering , electrical engineering
This paper presents the design and development of a compact dual linearly polarized aperture‐coupled microstrip patch antenna array system for radio frequency identifications (RFID) applications. Two different antenna designs, Antenna‐1 and Antenna‐2, for RFID tag and reader applications are presented at the C and S bands, respectively. The antennas use two symmetric coupling apertures to excite two orthogonal modes for dual‐polarization operation. High isolation of the order of −35 dB is obtained by proper selection of the shape and positions of the coupling aperture. The prototype antenna yields a 14.6‐dBi peak gain, a 36° 3‐dB beamwidth (HPBW), a 30‐dB cross‐polarization level, and isolation better than 38 dB between the two orthogonal polarizations (Tx and Rx) at the S band, and a 7.7‐dBi peak gain, a 70° 3‐dB beamwidth (HPBW), a 24‐dB cross‐polarization level, and isolation better than 38 dB between the orthogonal polarization at the C‐band, respectively. The antenna yields a 10‐m identification‐read range in the field trial. The findings are very promising for RFID applications. © 2003 Wiley Periodicals, Inc. Microwave Opt Technol Lett 39: 354–360, 2003; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.11215