Patent
Harvesting ambient radio frequency electromagnetic energy for powering wireless electronic devices, sensors and sensor networks and applications thereof
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TLDR
In this paper, a system and device for harvesting various frequencies and polarizations of ambient radio frequency (RF) electromagnetic (EM) energy for making a passive sensor (tag) into an autonomous passive sensor adapted to collect and store data with time-stamping and some primitive computation when necessary even when an interrogating radio frequency identification (RFID) reader is not present (not transmitting).Abstract:
A system and device for harvesting various frequencies and polarizations of ambient radio frequency (RF) electromagnetic (EM) energy for making a passive sensor (tag) into an autonomous passive sensor (tag) adapted to collect and store data with time-stamping and some primitive computation when necessary even when an interrogating radio frequency identification (RFID) reader is not present (not transmitting). A specific source of ambient RF EM energy may include wireless fidelity (WiFi) and/or cellular telephone base stations. The system and device may also allow for the recharging of energy storage units in active and battery assisted passive (BAP) devices. The system could be a “smart building” that uses passive sensors with RF EM energy harvesting capability to sense environmental variables, security breaches, as well as information from “smart appliances” that can be used for a variety of controls and can be accessed locally or remotely over the Internet or cellular networks.read more
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References
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Patent
Remotely powered and remotely interrogated wireless digital sensor telemetry system
TL;DR: In this paper, the transponder is connected to the receiver coil or antenna to provide greater current to the sensor or other power-using device than would be available to the sensors or other devices if the sensor and other devices were connected between the first and second end.
Patent
Apparatus for energizing a remote station and related method
Marlin H. Mickle,Dmitry Gorodetsky,Leonid Mats,Lorenz Neureuter,Minhong Mi,Carl Taylor,Chad Emahizer +6 more
TL;DR: An apparatus for remote interaction with an object of interest includes a remote station for obtaining information from the object, a base station for transmitting energy in space to, communicating with the remote station, and a conversion means for energizing the remote base station responsive to the transmitted energy as discussed by the authors.
Patent
Method and apparatus for wireless powering and recharging
TL;DR: In this article, an arrangement for charging a charge storage device by placing the charge storage devices in an RF or microwave radiation field is provided, where one or more antennas connected to the antennas rectify the received RF electromagnetic field an produce a DC output current, which is used to charge the device.
Patent
Semi-passive radio frequency identification (RFID) tag with active beacon
TL;DR: A radio frequency beacon device for use with a backscatter interrogator includes a processor, a receiver coupled to the processor, and an active transmitter coupled to a processor as discussed by the authors, the active transmitter being configured to transmit an RF signal, in response to a trigger signal.
PatentDOI
System and method for wireless electrical power transmission
TL;DR: In this article, a power transmission system using directional ultrasound for power transmission includes a transmitting device and a receiving device, where the transmitting device has a set of ultrasound transducers forming an ultrasound transducer array.