DocumentCode
1065424
Title
Wideband adaptive isolator for UHF RFID reader
Author
Pursula, Pekka ; Marttila, I. ; Nummila, K.
Author_Institution
VTT Tech. Res. Centre of Finland, Espoo
Volume
45
Issue
12
fYear
2009
Firstpage
636
Lastpage
637
Abstract
A wideband adaptive isolator for a UHF RFID reader with a minimum component count is introduced. The operation of the device is based on a reflection from a variable load, which is connected to a port of a hybrid coupler. The other ports are connected to the receiver (RX), transmitter (TX) and antenna ports of the reader. The isolator provides an isolation of 50 dB from TX to RX at the 800 MHz-1 GHz band, covering the worldwide UHF RFID bands. The adaptive system ensures high isolation up to an antenna return loss of 6 dB, or reflection coefficient of 0.5. The measured loss in the TX-to-antenna and antenna-to-RX paths is 4 dB.
Keywords
UHF antennas; UHF couplers; microwave isolators; radio receivers; radio transmitters; radiofrequency identification; UHF RFID reader; antenna port; frequency 800 MHz to 1 GHz; hybrid coupler; radio frequency identification; radio receiver; radio transmitter; reflection coefficient; wideband adaptive isolator;
fLanguage
English
Journal_Title
Electronics Letters
Publisher
iet
ISSN
0013-5194
Type
jour
DOI
10.1049/el.2009.0512
Filename
5069783
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