Patent ID: 8531271
Filing Date: 2013-09-10
Classification: G06K,H04B

Abstract:
1. An RFID system, comprising: a reader/writer which has a controller section and a plurality of antennae each with characteristic polarization, and which sends a continuous carrier wave; and a tag which uses tag information to modulate the continuous carrier wave and sends back a response signal to the reader/writer, wherein the controller section judges prior to send the continuous carrier wave, the level of the interference signal received from another reader/writer by switching each of the plurality of antennae for each of the plurality of channels and determines a channel and antenna for which the judged level of the interference signal is equal to or less than the threshold value, and receives a response signal from the tag by means of the determined antenna via the determined channel, wherein the channels are the respective bands of a frequency band that has been divided into a plurality of bandwidths.