Title :
Piggyback modulation for UHF RFID sensors
Author :
Chen, Huan-Yang ; Bhadkamkar, Atul ; Van der Weide, Daniel W.
Author_Institution :
Dept. of Electr. & Comput. Eng., Univ. of Wisconsin - Madison, Madison, WI, USA
Abstract :
We introduce the technique of “piggybacking” sensor data onto existing commercial passive UHF RFID tags. Sensor data fed into a PIN diode modulator is coupled onto the tag and transmitted along with the tag ID via backscatter. The radar cross section (RCS) of the tag antenna is a function of the input impedance of the tag ASIC, coupling S-parameters, and the input impedance of the PIN diode modulator. Both analog and digital sensor signals coexisting with identification data are presented.
Keywords :
S-parameters; UHF antennas; UHF detectors; application specific integrated circuits; modulation; p-i-n diodes; radar cross-sections; radiofrequency identification; PIN diode modulator; RCS; UHF RFID sensors; analog sensor signals; coupling S-parameters; digital sensor signals; identification data; input impedance; passive UHF RFID tags; piggyback modulation; piggybacking sensor data; radar cross section; tag ASIC; tag ID; tag antenna; Application specific integrated circuits; Backscatter; Electromagnetic coupling; Impedance; Loaded antennas; Passive RFID tags; Radar cross section; Radiofrequency identification; Reflector antennas; Scattering parameters; PIN diode; UHF RFID; coupling; piggyback modulation; radar cross section; sensor;
Conference_Titel :
Microwave Symposium Digest (MTT), 2010 IEEE MTT-S International
Conference_Location :
Anaheim, CA
Print_ISBN :
978-1-4244-6056-4
Electronic_ISBN :
0149-645X
DOI :
10.1109/MWSYM.2010.5515949
