Carrier leakage cancellation in an RFID reader

摘要

A transceiver apparatus comprises at least one antenna (16), selectively connectable (15) to a receiver portion (14) and a transmitter portion (13) of the apparatus. The apparatus further comprises a carrier cancellation loop comprising a vector phase modulator (22), whereby magnitude and phase of an output continuous wave (CW) signal are scaled and inverted and added to an input signal to cancel CW leakage.