Title:
SYSTEM FOR ENCODED RF AND ENCODED MAGNETIC FIELD COMMUNICATION AND METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO1999057676
Kind Code:
A8
Abstract:
A wireless security system combines encoded RF and encoded magnetic field operation into a base unit device and a remote unit device, overcoming the limitations of RF only or magnetic field only wireless security devices. The base unit is comprised of a power supply, a base processing unit, an RF receiver and a base inductor-capacitor (LC) transceiver. The base processing unit is capable of controlling both encoded RF and encoded magnetic field operation. The remote unit is comprised of a battery, a remote processing unit, an RF transmitter, a remote magnetic field converter circuit, manual control and an energy storage device. The remote processing unit, which is capable of controlling both encoded RF and encoded magnetic field operation, is implemented on a single, monolithic integrated circuit. The remote unit device can be miniaturized to relative smallness to the extent that it can be embedded, for example, within an automobile key. The remote unit device can convert magnetic field energy to DC electrical energy for the purposes of supplying power to the remote unit device, conserving battery power and re-charging the battery.
Inventors:
BRUWER FREDERICK J
SMIT WILLEM
VAN NIEKERK JOHANNES A
SMIT WILLEM
VAN NIEKERK JOHANNES A
Application Number:
PCT/US1999/009893
Publication Date:
January 06, 2000
Filing Date:
May 06, 1999
Export Citation:
Assignee:
MICROCHIP TECH INC (US)
International Classes:
G06K7/10; G06K17/00; G06K19/07; G07C9/00; G08B25/10; H02J17/00; H04B1/04; H04B5/02; (IPC1-7): G06K7/00
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