| Summary: | 碩士 === 國防大學中正理工學院 === 應用物理研究所 === 96 === In this thesis, three small RFID tag antennas are proposed. They are all of half-wave dipole types and operated at UHF and 2.45GHz dual bands. Good radiation efficiency, omni-directional radiation patterns and more shortened physical length than that of a conventional half-wave dipole antenna are also the essential requirements for the proposed antennas. There are different constructions for the radiators of the three proposed antennas. For reducing the whole length of a half-wave dipole antenna, the first antenna design has a Minkowski Island Fractal construction, the second antenna design has a complicated radiator composed of Koch Curve and Minkowski Fractal structure, while the third proposed RFID tag antenna is constructed with a meander line. In the same time, the proposed antennas have good impedance matching at two operating frequencies by properly designing a simple matching construction at the input port.
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