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Paraboolantenne: Verskil tussen weergawes

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Lyn 33:
Die paraboolantenne is ontwerp deur die Duitse fisikus [[Heinrich Hertz]] toe hy radiogolwe in 1887 ontdek het. Hy het silindriese paraboliese weerkaatsers met dipool antennes gebruik wat vonk tussen die punte tydens send en ontvangs van seine gedurende sy eksperimente.
 
[[Lêer:Parabola with focus and arbitrary line.svg|duimnael|upright=1.3|ParabolicParaboolantennes antennasgebruik aredie basedgeometriese onbeginsel thedat geometricaldie propertypad ofvan the paraboloid that the pathsdie ''FP<sub>1</sub>Q<sub>1</sub>, FP<sub>2</sub>Q<sub>2</sub>, FP<sub>3</sub>Q<sub>3</sub>'' arealmal allewe thelank same length. So a spherical wavefront emitted by a feed antenna at the dish's focus ''F'' will be reflected into an outgoing plane wave ''L'' travelling parallel to the dish's axis ''VF''is.]]
 
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Parabolic antennas are based on the geometrical property of the paraboloid that the paths ''FP<sub>1</sub>Q<sub>1</sub>, FP<sub>2</sub>Q<sub>2</sub>, FP<sub>3</sub>Q<sub>3</sub>'' are all the same length. So a spherical wavefront emitted by a feed antenna at the dish's focus ''F'' will be reflected into an outgoing plane wave ''L'' travelling parallel to the dish's axis ''VF''.]]
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