DocumentCode :
3346771
Title :
A polarization- and power-agile interrogator antenna for UHF RFID systems
Author :
Mayer, Lukas W. ; Scholtz, Arpad L.
Author_Institution :
Inst. of Commun. & Radio-Freq. Eng., Vienna Univ. of Technol., Wien, Austria
fYear :
2010
fDate :
20-24 Sept. 2010
Firstpage :
521
Lastpage :
524
Abstract :
We present an active interrogator antenna for UHF RFID (radio-frequency identification) systems which is capable of transmitting electromagnetic radiation at any desired polarization and with adjustable transmit power. We use a dual-polarized patch antenna originally radiating linear polarization in +45° and -45° direction and feed each input with signals that can be adjusted in both phase and amplitude by two vector modulators. The vector modulators are controlled by a microprocessor that provides an RS-232 interface. The antenna also comprises power amplifiers to achieve a maximum transmit power of 2 W at any desired polarization mode. For testing we perform measurements that determine the radiation pattern and polarization mode of a commercially available transponder and find very good agreement with simulation results.
Keywords :
UHF antennas; active antennas; radiofrequency identification; UHF RFID systems; polarization-agile interrogator antenna; power-agile interrogator antenna; transmitting electromagnetic radiation; Antenna measurements; Antenna radiation patterns; Radiofrequency identification; Transmitting antennas; Transponders;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Electromagnetics in Advanced Applications (ICEAA), 2010 International Conference on
Conference_Location :
Sydney, NSW
Print_ISBN :
978-1-4244-7366-3
Type :
conf
DOI :
10.1109/ICEAA.2010.5652229
Filename :
5652229
Link To Document :
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