Method for characterizing the radio link of RFID tags
First Claim
1. A method for characterizing a radio link, comprising utilizing a radio frequency interrogator and a first wireless radio frequency transponder, the response of which in an essentially anechoic space is known, comprising(a) measuring the response of the first wireless radio frequency transponder in a target environment using a chosen interrogator-transponder geometry,(b) calculating a deviation between the responses of the radio frequency wireless transponder in the target environment and in the essentially anechoic space for characterizing the radio link established in the target environment.
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Accused Products
Abstract
The method relates to a method of characterizing a radio link. In the method, a radio frequency interrogator and a first radio frequency transponder, the response of which in an essentially anechoic chamber is known, are utilized. According to the invention, the response of the first radio frequency transponder is measured in a target environment in the chosen interrogator-transponder geometry and the responses of the radio frequency transponder in the target environment and in an essentially anechoic chamber are compared for characterizing the actual radio link. The invention provides information on multi-path propagation of radio waves characteristic to the target environment, which can be further taken into account in, for example, RFID system design.
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Citations
28 Claims
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1. A method for characterizing a radio link, comprising utilizing a radio frequency interrogator and a first wireless radio frequency transponder, the response of which in an essentially anechoic space is known, comprising
(a) measuring the response of the first wireless radio frequency transponder in a target environment using a chosen interrogator-transponder geometry, (b) calculating a deviation between the responses of the radio frequency wireless transponder in the target environment and in the essentially anechoic space for characterizing the radio link established in the target environment.
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18. A method for characterizing a radio link, comprising utilizing a radio frequency interrogator and a first wireless radio frequency transponder, the response of which in an essentially anechoic space is known, comprising:
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(a) measuring the response of the first wireless radio frequency transponder in a target environment using a chosen interrogator-transponder geometry, (b) calculating a deviation between the responses of the radio frequency wireless transponder in the target environment and in the essentially anechoic space for characterizing the radio link established in the target environment, (c) measuring the response of the first wireless radio frequency transponder at a first distance and a second distance, different than the first distance, from the antenna in the far field of the antenna, and (d) determining, based on said two measurements, the location of the apparent phase center of the antenna connected to the interrogator. - View Dependent Claims (27)
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22. A method for calibrating a radio-frequency communications system in a target environment, comprising
placing a first wireless transponder to a first location within the target environment, measuring the response of the first wireless transponder using an interrogator placed to a second location within the target environment, comparing the measured response of the first wireless transponder with a response of the transponder in an essentially anechoic space for obtaining a calibration function characterizing said target environment.
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28. A method for calibrating a radio-frequency communications system in a target environment, comprising:
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placing a first wireless transponder to a first location within the target environment, measuring the response of the first wireless transponder using an interrogator placed to a second location within the target environment, comparing the measured response of the first wireless transponder with a response of the transponder in an essentially anechoic space for obtaining a calibration function characterizing said target environment, wherein the response of the transponder is measured by; determining the activation threshold power of the transponder, and determining the strength of a backscatter signal obtained from the transponder at said activation threshold power.
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Specification