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Development of Optically Transparent Ultrathin Microwave Absorber for Ultrahigh-Frequency RF Identification System

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3 Author(s)
Yoshinobu Okano ; Tokyo City University, Tokyo, Japan ; Satoshi Ogino ; Koji Ishikawa

The application of UHF radio-frequency identification (RFID) systems is rapidly increasing. However, the reliability of indoor telecommunication is adversely affected by multiple reflection interference. Consequently, to establish a highly reliable UHF-RFID system, it is essential to improve the multipath environment. This paper describes an ultrathin microwave absorber that is designed to improve the multipath environment of UHF-RFID systems. This absorber is optically transparent so that it does not create blind areas for surveillance cameras installed near an UHF-RFID system (e.g., at the entrance of an office or a warehouse). The improved tag identification probability using this absorber is demonstrated in an actual warehouse.

Published in:

IEEE Transactions on Microwave Theory and Techniques  (Volume:60 ,  Issue: 8 )