Power Feeding to RFID Tags Within Specific Distance and Transponder Control Signal
We are proposing the method of supplying driving power of the RFID tag contain-ing transponder control signal by the electro-magnetic field besides the communication signal. From this viewpoint, we are also proposing power supplying method to RF tags within specific distance using two antennas. In the method, we use two properties: (1) The intensity of the electromagnetic field from two loop antennas sharply decreases depending on the distance, and (2) the supplied-signal phase difference sharply changes at a position 1=(2π) of the wavelength. We used transmitting resonance-type antennas composed of capacitor of 1 pF and the five turns coil of 30 cm in diameter, and receiving antennas composed of variable capacitor from 10 pF to 120 pF and the card-type coil with five turns. The amplitude is 10V at the transmitting side, and the resonance-frequency is about 17.6 MHz. Under this condition, we were able to drive an IC-encoder-chip of 2V and 0.3mA within the distance up to 70 cm. Next, we proposed the ball-type antenna to induce only magnetic fields mainly.
Kengo Ueyama Akitoshi Ito Yukio Iida Noriaki Muranaka
FSC,and Dept.of Electric and Electronic Eng.,Faculty of Engineering Science Kansai University,Japan
国际会议
Progress in Electromagnetics Research Symposium 2009(2009年电磁学研究新进展学术研讨会)(PIERS 2009)
北京
英文
535-537
2009-03-23（万方平台首次上网日期，不代表论文的发表时间）