Rectenna demonstrators at holst centre / imec and eindhoven university of technology

To realize a sufficiently high dc voltage for a realistic load impedance with a rectenna we may increase the receiving aperture or employ a voltage boost circuit. A gridded, square loop FSS, loaded with Schottky diodes is demonstrated as an example of the first solution. For the second solution we have employed a Texas Instruments TI BQ22570 Power Management circuit combined with a miniaturized rectenna. This system has been capable of powering a sensor to distances in excess of 6m from a 915MHz, 3W EIRP source. The circuit, combined with a rectifier and 6dBi antenna is expected to deliver 60mW of power, during 40ms, every 2 minutes up to 10m from the source.