Title :
Improvement of null zone avoidance capability for HF-band RFID using diversity combining of loop antennas
Author :
Hirayama, Hiroshi ; Satake, Yu ; Kikuma, Nobuyoshi ; Sakakibara, Kunio
Author_Institution :
Dept. of Comput. Sci. & Eng., Nagoya Inst. of Technol., Nagoya
Abstract :
A method to avoid null zone for HF-band RFID without expanding antenna size is proposed. A loop antenna is split into four parts, which work as a planar array antenna. Combining circuit for loop antennas consists of three phase inverters. Phase inverters are controlled to obtain maximum power to drive RFID chip. We have validated by FDTD simulation that the proposed scheme enlarges worst received power by 6.6 dB.
Keywords :
HF antennas; diversity reception; loop antennas; planar antenna arrays; radiofrequency identification; FDTD simulation; HF-band RFID; diversity combining; loop antenna; null zone avoidance capability; planar array antenna; three phase inverter; Directive antennas; Diversity reception; Finite difference methods; Inverters; Magnetic fields; Planar arrays; RFID tags; Radiofrequency identification; Receiving antennas; Time domain analysis;
Conference_Titel :
Antennas and Propagation, 2009. EuCAP 2009. 3rd European Conference on
Conference_Location :
Berlin
Print_ISBN :
978-1-4244-4753-4
Electronic_ISBN :
978-3-00-024573-2
