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US 4,908,615 AGranted
Traffic light control system and method
AssigneeTexas Instruments Incorporated
InventorBurhan Bayraktaroglu
Life of this patent
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Abstract
Preferred embodiments include a radar traffic light control system with a transmitter/receiver module including an array (103) of interconnected microstrip patch antennas (38) which also act as the resonators for oscillators powered by IMPATT diodes (34, 36); varactors (158) on the interconnections permit beam steering for scanning roadways.
Claims8
A traffic light control system, comprising:
- (a) a transmitter/receiver, said transmitter/receiver for transmitting a beam towards a roadway, detecting reflections of said beam from vehicles on said roadway, and outputting a detection signal;
- and
- (b) circuitry connected to said transmitter/receiver, said circuitry converting said detection signal into traffic light control signals;
- (c) said transmitter/receiver including an array of active antennas, each of said active antennas having:
- i. an oscillator including a power source and a resonator;
- and
- ii. a radiator coinciding with said resonator;
- (d) said transmitter/receiver further including interconnections among said active antennas, said interconnections coupling said active antennas together.
5 more elements
Dependencies are inferred from the claim text.