Impedance matching of an electromagnetic transponder reader
US7603082B2 · kind B2 · utility
2Cited by
12References
23Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 23, 2005 |
| Grant date | Oct 13, 2009 |
| Priority date | — |
| Expiry date | Mar 24, 2027 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S13/758
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A terminal for generating an electromagnetic field, including an oscillating circuit capable of receiving a high-frequency A.C. excitation voltage via an amplifier and a directional coupler, the oscillating circuit having at least one element of variable capacitance, and circuitry for modifying the value of this capacitance according to the amplitude of a signal extracted from the coupler.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.