This paper presents a complete, autonomous, wireless temperature sensor, fully encapsulated in a 10.6mm volume. The sensor includes solar energy harvesting with an integrated 2 μAh battery, optical receiver for programming, microcontroller and memory, 8GHz UWB transmitter, and miniaturized custom antennas with a wireless range of 7 meters. Full, stand-alone operation was demonstrated for the first time for a system of this size and functionality.

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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4737956PMC
http://dx.doi.org/10.1109/VLSIC.2015.7231258DOI Listing

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