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A Method to Improve Isolation for Passive RFID Applications  

Kim, Jae-Kwon (Dept. of Electronic Eng., Sogang University)
Burm, Jin-Wook (Dept. of Electronic Eng., Sogang University)
Publication Information
Journal of the Institute of Electronics Engineers of Korea CI / v.44, no.4, 2007 , pp. 45-49 More about this Journal
Abstract
The isolation between transmitter and receiver has been a critical problem in a pulse-modulated RFID (Radio Frequency Identification) system where transmitter and receiver use the identical frequency. A method using a switch, a mixer, a BPF (band-pass filter), and an additional oscillator in the transmitter is proposed to improve the isolation between transmitter and receiver in an RFID system. The Proposed system up-converts the outgoing wave from a frequency different from the received signal and improves the isolation. The proposed method provided additional 20 dB improvement on the isolation.
Keywords
Surface Acoustic Wave; Passive RFID system; Heterodyne receiver;
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