RFID transponder using ambient radiation
US8373543B2 · kind B2 · utility
24Cited by
13References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 22, 2009 |
| Grant date | Feb 12, 2013 |
| Priority date | — |
| Expiry date | Jun 5, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04Q2213/13095
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A tag operates in an environment where transmitted interrogators are not possible or desired. High-efficiency diode rectifiers and low-power oscillators are used in combination with an energy storage element and hysteretic switch. The combination of multi-diode rectifier, low power tunnel diode oscillator, energy storage element and hysteretic switch allow for nanowatt levels of received RF power to be stored to produce micro-watts of RF transmit power. The device trickle charges off of ambient RF radiation until enough energy is stored for transmission.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.