# US 7,609,164 B2 · Radio tag evaluation system and method > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 7,609,164 B2 - Document ID: US7609164B2 - Status: Granted - Kind: B2 - Application number: 11/508,263 - Filed: 2006-08-23 - Published: 2007-03-01 - Granted: 2009-10-27 - Earliest claimed: 2005-08-26 - Assignees: Honda Motor Co., Ltd. - Inventors: Seiichi Yamashita - Web page: https://patentgrep.com/patent/US7609164B2 ## CPC - G06K 7/0008: {General problems related to the reading of electronic memory record carriers, independent of its reading method, e.g. power transfer} - G06K 7/0095: {Testing the sensing arrangement, e.g. testing if a magnetic card reader, bar code reader, RFID interrogator or smart card reader functions properly (testing of electrical circuits G01R31/28)} - G06K 7/10316: {using at least one antenna particularly designed for interrogating the wireless record carriers (antennas in general H01Q1/22)} - G06K 7/10465: {the interrogation device being capable of self-diagnosis, e.g. in addition to or as part of the actual interrogation process (testing of electrical circuits in general G01R31/28)} - G01R 29/10: Radiation diagrams of antennas - G01S 7/40: Means for monitoring or calibrating - G06K: GRAPHICAL DATA READING (image or video recognition or understanding G06V); PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS - G01R: MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES (indicating correct tuning of resonant circuits H03J3/12) - G01S: RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES ## Abstract A radio tag evaluation system includes a transmission member providing a frequency signal to a radio tag. A transmitting antenna, which is placed on one side of the radio tag for transmiting the inquiry signal supplied from the transmission member. The radio tag is placed and supported around the center of an anechoic box. A receiving antenna is placed on the other side of the radio tag. A reception member is connected to the receiving antenna for analyzing a response signal. The transmitting antenna and the receiving antenna are placed orthogonally to each other, and the primary face of the radio tag is placed substantially at an angle of 45 degrees with respect to the transmitting antenna. The receiving antenna is unable to directly receive a transmission radio wave which has passed around the radio tag. Accordingly, a response signal emitted from the radio tag can be relatively strongly received. ## Claims ### Claim 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. ### Claim 2 (depends on 1) The radio tag evaluation system according to claim 1, wherein the reception means is a time series spectrum analyzer. ### Claim 3 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. ### Claim 4 (depends on 3) The radio tag evaluation system according to claim 3, wherein the transmitting and receiving antennas are placed orthogonally to each other, and wherein a primary face of the radio tag is placed substantially at 45 degrees to the transmitting and receiving antennas. ### Claim 5 (depends on 4) The radio tag evaluation system according to claim 4, wherein the transmitting antenna and the receiving antenna are dipole antennas with a length equal to half of a wavelength of the transmission wave. ### Claim 6 (depends on 4) The radio tag evaluation system according to claim 4, wherein the reception means is a time series spectrum analyzer. ### Claim 7 (depends on 3) The radio tag evaluation system according to claim 3, wherein the transmitting antenna and the receiving antenna are dipole antennas with a length equal to half of a wavelength of the transmission wave. ### Claim 8 (depends on 7) The radio tag evaluation system according to claim 7, wherein the reception means is a time series spectrum analyzer. ### Claim 9 (depends on 3) The radio tag evaluation system according to claim 3, wherein the conversion means imparts an opposite phase to the part of the transmission wave distributed to the other side, the opposite phase being opposite to that of a signal obtained by eliminating the response signal from the signal received from the receiving antenna to the addition means. ### Claim 10 (depends on 9) The radio tag evaluation system according to claim 9, wherein the conversion means adjusts the amplitude of the part of the transmission wave, which is distributed to the other side, to the same amplitude or to the substantially same amplitude as the amplitude of the signal obtained by eliminating the response signal from the signal received from the receiving antenna to the addition means. ### Claim 11 (depends on 10) The radio tag evaluation system according to claim 10, wherein the reception means is a time series spectrum analyzer. ### Claim 12 (depends on 9) The radio tag evaluation system according to claim 9, wherein the reception means is a time series spectrum analyzer. ### Claim 13 (depends on 3) The radio tag evaluation system according to claim 3, wherein the reception means is a time series spectrum analyzer. ### Claim 14 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. ### Claim 15 (depends on 14) The radio tag evaluation system according to claim 14, wherein the transmitting and receiving antennas are placed orthogonally to each other, and wherein a primary face of a radio tag is placed substantially at 45 degrees to the transmitting and receiving antennas. ### Claim 16 (depends on 14) The radio tag evaluation system according to claim 14, wherein the transmitting antenna and the receiving antenna are dipole antennas with a length equal to half of a wavelength of the transmission wave. ### Claim 17 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. ### Claim 18 (depends on 17) The radio tag evaluation method according to claim 17, wherein the reception means is a time series spectrum analyzer.