Immobilizer Circuit
First Claim
1. An immobilizer device for communicating with a base station for operation of a circuit connected to the base station, the immobilizer device comprising:
- an antenna circuit including three antennas orthogonally-oriented relative to one another, each antenna being configured to receive wireless transmissions from a remote base station;
a wireless power circuit connected to the antenna circuit and configured to provide power using signals received from the base station via at least one of the three antennas;
a communications circuit powered by the wireless power circuit, connected to the antenna circuit and configured togenerate signals corresponding to the received wireless transmissions on each of the antennas, and provide each generated signal on channel corresponding to the antenna,provide data communications received from the base station via at least one of the channels, andtransmit data to the base station via an antenna corresponding to one of the channels; and
a logic circuit configured to process data communications on at least one of the channels, and to generate a data communication for transmission to the base station using the communications circuit and the one of the antennas corresponding to the at least one of the channels.
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Accused Products
Abstract
An immobilizer device is configured for communicating with a base station. The immobilizer device includes an antenna circuit including three orthogonally-oriented antennas configured to receive a signal from a field generated by a base station. A power circuit is configured to draw power via the field on each of the antennas, and a communications circuit is configured to communicate with the base station via any of the antennas. The strength of the signals received via the antennas is evaluated and used to select one of the antennas for use in data communications and, if appropriate, as a power supply.
25 Citations
20 Claims
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1. An immobilizer device for communicating with a base station for operation of a circuit connected to the base station, the immobilizer device comprising:
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an antenna circuit including three antennas orthogonally-oriented relative to one another, each antenna being configured to receive wireless transmissions from a remote base station; a wireless power circuit connected to the antenna circuit and configured to provide power using signals received from the base station via at least one of the three antennas; a communications circuit powered by the wireless power circuit, connected to the antenna circuit and configured to generate signals corresponding to the received wireless transmissions on each of the antennas, and provide each generated signal on channel corresponding to the antenna, provide data communications received from the base station via at least one of the channels, and transmit data to the base station via an antenna corresponding to one of the channels; and a logic circuit configured to process data communications on at least one of the channels, and to generate a data communication for transmission to the base station using the communications circuit and the one of the antennas corresponding to the at least one of the channels. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. An immobilizer key fob device for communicating with a base station for an automobile ignition circuit that requires data from the immobilizer to operate, the immobilizer key fob device comprising:
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an antenna circuit having three orthogonally-oriented antennas that respectively generate input signals on three different antenna channels, and configured and arranged to align with a field generated by a single-antenna in the base station for receiving RF communications from the base station; a power circuit configured to generate a supply voltage using an input radio frequency (RF) signal received from the base station on at least one of the antennas; a demodulator circuit configured to select one of the channels based upon a strength of a signal communicated thereupon, and to provide a data signal from the selected channel for processing; a modulator circuit configured to modulate a carrier signal for data transmission back to the base station; a memory circuit configured to store authentication data and program data; and a logic circuit configured to execute the program data in the memory circuit to process data received via the antenna circuit and demodulator circuit, and to generate output data for communication back to the base station via the modulator circuit and antennal circuit, using the authentication data. - View Dependent Claims (17, 18, 19)
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20. A method for implementation at an immobilizer circuit for communicating with a remote base station using RF power, the method comprising:
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using an antenna circuit having three antennas orthogonally-oriented relative to one another, receiving wireless transmissions from the base station; using the wireless transmissions received on the antenna circuit from the base station to generate power to power a logic circuit; generating signals corresponding to the received wireless transmissions on each of the antennas, and providing each generated signal on a channel corresponding to the antenna; providing data communications received from the base station via at least one of the channels to the logic circuit; in the logic circuit, processing data communications received on at least one of the channels, generating a data communication for transmission to the base station using the communications circuit and the one of the antennas corresponding to the at least one of the channels; and transmitting the generated data communication to the base station via an antenna corresponding to one of the channels.
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Specification