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A novel compact polarization diversity antenna using a pair of parallel dipoles for mobile UHF radio frequency identification (RFID) is presented. The antenna is composed of a pair of parallel dipoles orthogonally placed on the feeding network. Compare to half wavelength conventional dipole antenna, the overall size of this antenna is less than quarter wavelength. With the compact and simple feeding...
A type of ultra-high frequency (UHF, 840–960MHz) band near-field antenna for RFID applications is proposed. The proposed near-field reader antenna consists of two spiral-shaped transmission lines and lines are parallel to each other. By adjusting the distance between two lines of the reader antenna, the strength of the field between two transmission lines and the recognition distance are able to be...
A passive UHF radio frequency identification (RFID) reader antenna with high transmit/receive isolation, which consists of two quadrifilar spiral antennas (QSAs) and the feeding networks, is proposed. The high isolation can be achieved by two concentric, circularly polarized antennas and 4-point feed circuits, which make the same circular polarization. The simulated and experimental results show that...
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