Radio frequency indentification tag
US8319611B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 3, 2008 |
| Grant date | Nov 27, 2012 |
| Priority date | — |
| Expiry date | Oct 23, 2030 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04Q2213/13095
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An ID tag has a stable internal supply voltage and extends the range of communication with the reader/writer during back scattering communication. An ASK-modulated signal pre-boost circuit to which antenna terminals are coupled is coupled in parallel with a rectifying circuit. In the ASK-modulated signal pre-boost circuit, a switch for back scattering, working as a modulator element, is provided. During back scattering communication, when a back scattering signal “1” is transmitted, only the current flowing in the signal receiving path of the modulation/demodulation unit is wasted by turning the switch for back scattering on. Additional current loss other than the loss for impedance matching can be prevented.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.