Doppler radar mounting structure for motor vehicles
First Claim
1. In a motor vehicle having a substantially-flat undercarriage, a rear wheel axle having a differential housing and Doppler radar speed sensor including an antenna section and a sensor section mounted on the underside of the undercarriage of the vehicle for detecting the speed thereof, a mounting structure for said Doppler radar speed sensor comprising,a chamber formed in said substantially-flat undercarriage of the vehicle, said chamber being recessed upward from the bottom level of said undercarriage and open downward for housing the whole of said Doppler radar speed sensor means, said recessed chamber being located in the vicinity of said differential housing and slightly in front of said rear wheel axle, andmeans for mounting said Doppler radar speed sensor means in said chamber of said vehicle undercarriage in such a manner that the opening end surface of said antenna section is directed rearwardly of the vehicle with a downward inclination toward the road surface and is positioned higher than the bottom level of said flat undercarriage of the vehicle.
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Accused Products
Abstract
A Doppler radar speed sensor including an antenna section and a sensor section is mounted on the underside of the automobile undercarriage. A recess for accommodating the Doppler radar speed sensor is formed in part of the underside of the automobile undercarriage within a rectangle surrounded by the wheels, and the Doppler radar speed sensor is mounted fully within the recess. This structure prevents the sensor from being damaged in an unfavorable environment or external vehicle devices from being interfered with by the leakage of the unrequired radar wave. For size reduction, the Doppler radar speed sensor is provided with a metal casing integrated with a slotted waveguide antenna. The slot array of the antenna is formed in one side of the metal casing, so that the metal casing, makes up part of the slot array antenna.
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Citations
11 Claims
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1. In a motor vehicle having a substantially-flat undercarriage, a rear wheel axle having a differential housing and Doppler radar speed sensor including an antenna section and a sensor section mounted on the underside of the undercarriage of the vehicle for detecting the speed thereof, a mounting structure for said Doppler radar speed sensor comprising,
a chamber formed in said substantially-flat undercarriage of the vehicle, said chamber being recessed upward from the bottom level of said undercarriage and open downward for housing the whole of said Doppler radar speed sensor means, said recessed chamber being located in the vicinity of said differential housing and slightly in front of said rear wheel axle, and means for mounting said Doppler radar speed sensor means in said chamber of said vehicle undercarriage in such a manner that the opening end surface of said antenna section is directed rearwardly of the vehicle with a downward inclination toward the road surface and is positioned higher than the bottom level of said flat undercarriage of the vehicle.
Specification