Abstract
This chapter includes a certain number of theoretical concepts that apply to chipless RFID. These concepts come from several fields, such as radar, antenna, and traditional RFID. First, we provide a precise definition of what the “response of a chipless tag” is and then we present the reading system that makes it possible to measure them. After establishing the physical definition of the response, we examine its different components. The component that is useful for coding is based on the resonant nature of the constituent parts of the tag, so we specify the characteristic quantities that make it possible to analyze these resonances. Finally, we demonstrate that the resonant nature of the response enables the implementation of techniques to improve the readability of a chipless tag. This chapter presents a general perspective of the physical phenomena involved in interrogating a chipless tag. The concepts addressed here will be used in the following chapters concerning the design of chipless RFID tags.
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