RADAR APPARATUS
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United States of America Patent
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Issued Date -
Feb 9, 2017
app pub date -
Jul 13, 2016
filing date -
Aug 4, 2015
priority date (Note) -
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Abstract
A radar apparatus of the present invention is provided with at least one horn antenna for radiating and receiving linearly-polarized radio waves. The inner circumferential surface of the horn antenna has a top surface and a bottom surface, and a right side surface and a left side surface facing each other, the top surface and the bottom surface being perpendicular to a direction of the electrical field and facing each other. The top surface and the bottom surface define a first steeply-widened portion having a first rate of a widening rate, and define a first gently-widened portion having a second rate of a widening rate, the second rate being lower than the first rate. High-order modes can be generated within the horn antenna by the first steeply-widened portion and the first gently-widened portion to reduce sidelobes in the elevation angle direction.
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