Patent ID: 7609164
Filing Date: 2009-10-27
Classification: G01R,G01S,G06K

Abstract:
1. A radio tag evaluation system evaluating a radio tag on the basis of a response signal outputted in response to an inquiry signal, the system comprising: transmission means providing, as a transmission wave, a frequency signal which includes the inquiry signal to the radio tag; a transmitting antenna, which is placed at a predetermined distance from the radio tag on one side of the radio tag, and which transmits the inquiry signal supplied from the transmission means, the radio tag being placed around the center of an anechoic box; a receiving antenna, which is placed at a predetermined distance from the radio tag on the other side of the radio tag, and which receives the response signal transmitted from the radio tag in response to the inquiry signal; reception means, which is connected to the receiving antenna, and which analyzes the response signal, distribution means distributing the transmission wave transmitted from the transmission means to a side of the transmitting antenna and the other side thereof; conversion means converting a phase and amplitude of part of the transmission wave distributed to the other side; and addition means adding the part of the transmission wave converted by the conversion means to a wave received by the receiving antenna, wherein the receiving antenna is separate from the transmitting antenna, and when a frequency of the response signal is analyzed, the system is adapted to judge whether or not performance of the radio tag is good.