Title :
A null-zone control method for RFID systems
Author :
Yamamoto, Masaaki ; Yamazoe, Takanori
Author_Institution :
Central Res. Lab., Hitachi, Ltd., Tokyo, Japan
Abstract :
A null-zone control method-which converts a null zone into a readable zone using only the standard antennas of a radio-frequency identification (RFID) reader-was developed. Outdoor evaluation of the method implemented in a RFID tag-reader system demonstrates the validity of the method; namely, it converts the null zone into a readable zone and attains high RFID-tag readability in the near field of the reader antenna.
Keywords :
UHF antennas; radiofrequency identification; telecommunication control; RFID systems; RFID tag-reader system; RFID-tag readability; null-zone control method; outdoor evaluation; radiofrequency identification reader; reader antenna; standard antennas; Antenna measurements; Equations; Mathematical model; Power measurement; Radiofrequency identification; Receiving antennas; RFID; electromagnetic analysis; multipath; null zone;
Conference_Titel :
Radio and Wireless Symposium (RWS), 2011 IEEE
Conference_Location :
Phoenix, AZ
Print_ISBN :
978-1-4244-7687-9
DOI :
10.1109/RWS.2011.5725433
