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Based on the research of the fractal tree monopole antenna, fractal tree structure of dipole RFID tag antenna was proposed. Resonant frequencies, reflection coefficient and radiation patterns of fractal tag antennas were simulated with MoM, and a papery substrate tag antenna of the third iterated fractal tree is manufactured. The results of simulation and… (More)
A type of near-field antenna for RFID reader is proposed, which has folded-dipole antenna structure. A parasitic capacitance patch is inserted on the gap between two arms of folded-dipole antenna to adjust the antenna impedance. It's shown by simulation that near-field antenna is efficient to reduce antenna dimension for UHF RFID reader.
—In this paper, a novel technique for planar inverted-F antenna (PIFA) with broadband circular polarization and pattern diversity is proposed. A defeated ground structure (DGS) has achieved broadband circular polarized (CP) PIFA by using a square branch at the ground corner with arrow-shaped slot. The pattern diversity PIFA system consists of two CP PIFAs… (More)