Broadband leaking carrier cancellation for RFID systems

Abstract

Reader systems for passive RFID tags suffer from a strong self generated interferer at the receiver, caused by transmitter to receiver leakage. This problem is often addressed by leaking carrier cancelers which compensate the leaking carrier at a single frequency. In this paper, we present measurements of the leakage channel in an RFID system. Based on the obtained results, we evaluate the leakage reduction that can be achieved by a novel analog broadband leakage canceller in the RF domain. Our proposed method allows for suppression of transmitter noise components. Moreover, it facilitates new broadband technologies, such as precision localisation or chipless RFID.