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Low-power UWB transmitter for RFID transponder applications

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4 Author(s)
Alberto Toccafondi ; Dept. of Inf. Eng., Univ. of Siena, Siena, Italy ; Daniele Zampilli ; Cristian Della Giovampaola ; Vasco Tesi

An UWB low power active transmitter operating in the European UWB band (6-8.5 GHz) is presented, which may find applications in RFID transponders with asymmetric downlink and uplink communication, as well as in others communication devices. It is based on a 7.25 GHz oscillator driven by a base-band pulse generator, and connected to a small size UWB antenna. The oscillator is turned on and off by the base-band pulsed control voltage, according to a modulation scheme, and it consumes power only when the 7.25 GHz pulse is generated. The RF pulse waveform exhibits a peak amplitude of about 2.2 Vpp and a width of about 2 ns. The power spectral density of the single UWB pulse is in accordance with the European UWB mask. A planar compact UWB antenna is also proposed as the load of the transmitter. It shows a return loss lower than -14 dB in the operating frequency band.

Published in:

RFID-Technologies and Applications (RFID-TA), 2012 IEEE International Conference on

Date of Conference:

5-7 Nov. 2012