1.1 - Wireless and Battery-less Sensor Using RF Energy Harvesting
- etc2014 - 34. European Telemetry and Test Conference
2014-06-03 - 2014-06-05
- 1. Sensors & Applications
- C. Merz, G. Kupris, M. Niedernhuber - Deggendorf Institute of Technology, Deggendorf (Germany)
- 8 - 13
The contribution introduces a RF energy harvesting circuit which can be used to power a wireless and battery-less sensor system. The sensor can be powered wirelessly over a distance of about two meters. The basic principles of RF energy harvesting are explained, it is shown how the system can be designed and special considerations are discussed. The proposed RF energy harvesting system operates at a frequency of 866.6 MHz, so that far field propagation is present. The system consists of an antenna, a matching circuit, a RF-to-DC conversion circuit and a power management module, including a storage capacitor, a comparator and a DC-to-DC converter. The harvester produces a pulsed output voltage of 1.8 V at an input power of at least -6 dBm.