Wireless tag device and the wireless tag system using the boost rectifier circuit and this microwave band

摘要

In order to implement novel utilization methods such as data communication and positioning using radio wave type wireless tags in microwave frequency bands which are utilizable in the 5GHz band and 24GHz band of ISM from the viewpoint of efficient utilization of radio wave resources, implementation of a low power consumption and high sensitivity RF receiving system is aimed. A microwave frequency band stub resonance booster circuit characterized by boosting the amplitude of an RF signal in a passive operation by resonating in series a 0.2pF to 0.01pF micro-capacitor element with a »g/2 open stub element to perform impedance conversion of the input RF signal is used. In addition, since a capacitor which has been conventionally inserted in order to repeat charging and discharging of the RF signal by using two diodes becomes useless by putting a DC resonant component of resonant-boosted output into an open state when voltage-doubling and rectifying the resonant-boosted RF signal, rectified output can be obtained and high-sensitivity reception and detection of the RF signal becomes possible without being affected by the capacitor which imparts comparatively large insertion loss.