Radio-wave transmission system of keyless entry system for autom

Details Radio-wave transmission system of keyless entry system for autom Radio-wave transmission system of keyless entry system for autom

1987-09-03

1990-01-30

Yusko, Donald J.

Communications: electrical

Continuously variable indicating

With meter reading

340825690, 180287, 70257, 307 102, G06F 704

Patent

active

048976440

ABSTRACT:
A keyless entry system allows operation of door locks, a trunk lid lock, a glove box lid lock, a steering lock device or so forth without mechanical keys. The keyless entry system includes electrically disconnected transmitter and a controller. The controller is connected to operate the devices. The transmitter is adapted to send a present code-indicative radio signal to the controller, which then compares the code contained in the radio signal from the transmitter with a preset code. The controller is provided with a dual-antenna system which ensures clear data transmission between the transmitter and the controller. The dual-antenna system includes at least a pair of antennas oriented essentially perpendicular to each other.

REFERENCES:
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IBM Technical Disclosure Bulletin, vol. 14, No. 12, May 1972, pp. 3860-3861.

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