ABSTRACT
The power transfer is independent of the data communication. The maximum transfer of power is obtained when the impedances of the bank of capacitors and of the antenna are complex conjugate. A trade-off has to be determined between power transfer and data communication because the same carrier signal is used for both operations. The architecture of the remotely powered system depends on the system specifications as well as on the radio regulations. Load and backscattering modulations are similar because the carrier is generated in the base station for both modulations. As it is the case for backscattering modulation, one single frequency is used for remote power and data communication. The main difference between these two types of modulation is that load modulation works in near-field. The transfer of data from the sensor node to the base station can be performed through a passive transmitter or by an active transmitter.
