Anti-theft system for a motor vehicle
US6100603A · kind A · utility
29Cited by
7References
7Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 24, 1998 |
| Grant date | Aug 8, 2000 |
| Priority date | — |
| Expiry date | Nov 24, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG07C2009/00793
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
Antennas of an anti-theft system are controlled with a pulse width modulated square-wave signal by a power control unit and a phase control unit. The control is such that a change in power causes no change in phase, and vice versa. This is accomplished by varying the pulse width of the square-wave signal if a change in power occurs and at the same time shifting the pulse rise time such that the phase remains constant.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.