Home > Wireless Sensors > RF-Powered Wireless Sensor Blog

RF-Powered Wireless Sensor Blog

December 29th, 2008

This blog is designed to promote and provide information on the development of RF energy harvesting as a means of powering wireless sensors, Active RFID tags, and other sensing and tracking devices.  RF energy harvesting and wireless power can be used to recharge batteries remotely or to create battery-free wireless sensors.

Powercast Corporation is a leader in RF energy harvesting technology and wireless power systems using RF energy.  The content of this blog is authored by Harry Ostaffe, Director of Marketing for Powercast.

  1. Eva Celia Corbett
    January 28th, 2009 at 14:58 | #1

    Most of us sensor developers need capacities of 10 to 100s mah with expectations for recharging under 30 mins. Are you working with any battery companies to store the power? I talked to a “microbattery” company that is launching a 10mah thin and small battery, complete with a wireless RF energy harvester to charge the battery. The company, Planar Energy Devices, already demonstrated the same battery (I think) during the Embedded Systems Conference this last fall and powered a temperature WSN - it lasted for hours, two days straight AND they then showed no degradation by the end of the show. Are you working with them or other battery companies?

  2. February 13th, 2009 at 17:14 | #2

    Powercast is actively working with multiple suppliers of energy storage technology - batteries, solid state/thin film, and supercapacitors. Our technology has been used to provide continuous trickle charging for AA/AAA-type rechargeable batteries, and we’ve demonstrated recharging mobile phone type batteries. Wireless sensors with low duty cycles and long sleep cycles actually spend most of their battery energy sleeping. This type of scenario aligns well with using small form factor energy storage devices and resupplying the power wirelessly on a scheduled basis (e.g. minutes, hourly or daily), or when a sensor reading is needed. The sleep state can essentially be replaced in a large part by the sensor being inactive, so much less power is required. With wireless power we can control when the energy is resupplied to the sensor and are not hindered by uncontrollable sources of energy such as ambient vibration, heat, or light.

  1. No trackbacks yet.