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Two novel extremely low‐profile slot‐coupled two‐element patch antennas for UHF RFID of people
Author(s) -
Švanda Milan,
Polívka Milan
Publication year - 2010
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.24894
Subject(s) - ultra high frequency , antenna (radio) , microwave , slot antenna , excitation , dipole antenna , electrical engineering , electrical impedance , engineering , electronic engineering , patch antenna , acoustics , optoelectronics , physics , telecommunications
Abstract Novel type of extremely low‐profile low‐dielectric constant substrate antenna, based on two‐element slot‐coupled shorted‐patch 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. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 249–252, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24894