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In this paper, we present two different designs for Ultra High Frequency (UHF) Radio Frequency Identification (RFID) passive tags. The first proposed design has been mounted on AK3 Tagsys® loop, which is a small loop antenna already connected to the chip while the second approach is connected directly with RFID chip. The optimized designs have compact size and bandwidth for worldwide UHF RFID applications...
Wideband RFID tag antennas are highly desired for global applications. Moreover, the wideband feature makes tags less sensitive to the external detuning. This paper presents a circuit-based bandwidth-enhancement theory by applying the double-tuning technique to tag antennas. Conditions of the optimum double-tuning and the maximum bandwidth out of double-tuning are derived. Closed-form equations are...
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