Reader tag coupling relations in RFID systems are an important aspect of the system development process that are often inadequately understood; nevertheless electromagnetic coupling becomes significant in the context of optimising RFID systems. Coupling volume theory provides an uncomplicated and a simple means of optimising electromagnetic coupling. This paper describes a practical application of the coupling volume theory to an antenna performance comparison, and presents the companion concept of radiation quality factor for comparing antenna performance. RFID systems are in a process of evolution and an important outcome of this process is the development of a class hierarchy where higher class labels are often battery power supported.
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