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Dual-band Tag designs of RFID antennas

Multi-band operation is traditionally achieved in RFID antennas by using several resonant elements or exploiting high order harmonics. Some dual-band design solution has been recently proposed to achieve 870MHz and 2.45 GHz or 2.45 GHz and 5.8 GHz compact multifunction transponders. The basic idea is to load a traditional tag antenna with parasitic.

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