MULTI-TAG AND RFID SYSTEM UTILIZING MULTI-TAG

摘要

PROBLEM TO BE SOLVED: To enable long-distance communications by enhancing the gain of a multi-tag, to reduce the occurrence of radio wave interferences between individual tags by sharpening directional patterns of the individual tags, to further reduce the size of the multi-tag by making the interval between the individual tags closer, to eliminate the affect (reflection) of an object existing at the rear of a composite tag by making the directional pattern of the multi-tag to be the single directional pattern, and further, to shorten the entire identification time of a plurality of the tags.;SOLUTION: The individual tag 2 is composed of an antenna, which has one virtual shaft and a radiation shaft perpendicular to the virtual shaft and for radiating radio waves in the front and rear directions, and a communication module. The multi-tag is composed of a plurality of the individual tags 2, a dielectric substrate 4, and a common reflecting plate 3. The individual tag 2 and the common reflecting plate 3 are arranged in the specific positional relation L (the distance of an equivalent wavelength λg from λg/8 to 3λg/8 or the distance of odd times of λg/4 ±λg/8) and integrated.;COPYRIGHT: (C)2005,JPO&NCIPI