Abstract
In this paper, the scope of harmonic RFID for using in body area network based batteryless implants is evaluated. The scope of conventional RFID becomes limited under very low tag modulation frequency and/or in strong cluttered environment. Both the conditions are applicable for biological implants. However, use of harmonic RFID can solve both the problems by operating at two different frequencies. Non Linear Transmission Line is the key element in generating the other frequency / second harmonic of the interrogation signal. A detailed design procedure is described to construct a lumped element based non linear transmission line. A single antenna based harmonic RFID tag design is possible with minimum number of components added to the conventional RFID tag circuit. The harmonic tag holds significant potential for very low data rate tag modulation and in highly cluttered environments.
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