Zero-Power Radio Device.

This report describes an unpowered radio receiver capable of detecting and responding to weak signals transmitted from comparatively long distances. This radio receiver offers key advantages over a short range zero-power radio receiver previously described in SAND2004-4610, A Zero-Power Radio Receiver. The device described here can be fabricated as an integrated circuit for use in portable wireless devices, as a wake-up circuit, or as a stand-alone receiver operating in conjunction with identification decoders or other electronics. It builds on key sub-components developed at Sandia National Laboratories over many years. It uses surface acoustic wave (SAW) filter technology. It uses custom component design to enable the efficient use of small aperture antennas. This device uses a key component, the pyroelectric demodulator, covered by Sandia owned U.S. Patent 7397301, Pyroelectric Demodulating Detector [1]. This device is also described in Sandia owned U.S. Patent 97266446, Zero Power Receiver [2].