Two novel extremely low‐profile slot‐coupled two‐element patch antennas for UHF RFID of people

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

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