Abstract

The objective of this paper is to provide a throughout complex-valued treatment of different aspects in backscatter modulation. Such modulation is a key aspect in radio-frequency identification (RFID) communication. The main point in this paper is the introduction of a complex radar cross section that describes amplitude and phase effects of any reflecting object but especially of RFID tag antennas. Then, the efficiency of sideband modulation is derived based on switching between different complex radar cross section values. Finally, the modulation efficiency is illustrated in an example scenario with a tag antenna placed in front of a metal plate.

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