Device for the exchange of data by electromagnetic waves
US5319802A · kind A · utility
10Cited by
7References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 15, 1991 |
| Grant date | Jun 7, 1994 |
| Priority date | — |
| Expiry date | Nov 15, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K19/0723
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
In order to increase the sensitivity and range of a system for the exchange of data by microwaves between a fixed station, or reader, and a mobile station, or badge, the modem of the badge includes an oscillator. A single transistor works, under a first bias, as a detector of the wave transmitted by the reader and demodulates this wave, and then, under a second bias, it works as an oscillator and modulates the response transmitted by the badge. Applications to the exchange of data at a distance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.