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This chapter explores the possibilities for including an RF energy harvester with the previously presented TRX front-end. A fundamental problem that has to be resolved is the decoupling of the harvester from the TRX while using the same antenna. In the proposed architecture, the harvester is decoupled from the TX with an RF-switch that can be turned on passively, i.e., the incoming RF power is converted by a start-up rectifier in order to activate the switch. To decouple the harvester from the RX, the non-linear impedances of the harvester and mixer are exploited. The proposed harvester also comprises a supply management circuit to charge an external energy storage device. The correct functionality of the harvester is verified experimentally using pulsed RF signals as emitted from wireless local area network (WLAN) routers showing that a large holding capacitance can be charged at a distance of up to about 30 cm. The measurements also verify that the harvester hardly affects the TRX performance, i.e., the degradation is less than 0.5 dB.
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