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Through introducing Koch fractal theory, an ordinary AMC structure and broadband Koch fractal AMC ground planes are designed and compared. The bandwidth and performance improvement of the fractal AMC ground plane are taken into consideration to acquire the low-profile antenna system at the frequency band from 40MHz to 70MHz. This research establishes the theoretical foundation for further experimental study. [ABSTRACT FROM PUBLISHER]

In this paper, a low-profile RFID tag antenna designed for applications in UHF band is proposed. The antenna has planar structure, and its overall size is 60 × 26 × 0.8mm2. It has larger inductive reactance than other tag antennas, so it's easier to match with the Philips U-CODE Gen 2 RFID chip whose input impedance is 43-J800Ω at frequency of 915MHz. Measured and simulated results of the proposed antenna are in good agreement. [ABSTRACT FROM PUBLISHER]