Radio tag evaluation system and method

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.

A radio tag evaluation system adapted to evaluate a radio tag on the basis of a response signal outputted in response to an inquiry signal, the system comprising:

• a transmission member providing a frequency signal which includes the inquiry signal;
• a transmitting antenna positioned at a predetermined distance from a radio tag for transmitting the inquiry signal supplied from the transmission member;
• a receiving antenna positioned at a predetermined distance from the transmitting antenna on another side of a radio tag from the transmitting antenna for receiving the response signal transmitted from a radio tag in response to the inquiry signal;
• a reception member being connected to the receiving antenna for analyzing 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.

A radio tag evaluation method for evaluating a radio tag on the basis of a response signal outputted in response to an inquiry signal, comprising the steps of:

• placing the radio tag around the center of an anechoic box;
• placing a transmitting antenna at a predetermined distance from the radio tag on one side of the radio tag;
• placing a receiving antenna at a predetermined distance from the radio tag on the other side of the radio tag;
• transmitting the inquiry signal to the radio tag from transmission means connected to the transmitting antenna;
• analyzing the response signal with reception means connected to the receiving antenna,
• distributing the transmission wave transmitted from the transmission means to a side of the transmitting antenna and the other side thereof;
• converting a phase and amplitude of part of the transmission wave distributed to the other side;
• and
• 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.