A Study on Resonant Characteristics of RF tag device and Its Application to Factory Automation
An RF tag device is comprised of a spiral coil and a capacitor on a plastic film by a chemical etching technique and has been already used as a resonant marker for detecting shoplifting. It is small and light, so it may be applicable for vehicle navigation and product verification. When the excitation frequency of an electromagnetic wave radiating from an antenna traverses resonance, an electrical ring-down may be generated, so an RF tag device can be easily detected and its resonant frequency can be determined. In this paper I have examined the resonant characteristics and performance of RF tag device to construct the sensing system consisting of the antenna and RF tag devices. And I have shown that RF tag devices can be utilized as a resonant identification for a mobile robot to determine its direction alternatively and to assort several kinds of articles. These examinations have proved RF tag devices to be useful in various areas of factory automation.