Satellite Dish Effects
A focal cloud can render a satellite dish rather inefficient in relation to its size in specific frequencies. If the imperfections are formed in a way that the phase shifts of reflected waves, at a large portion of the dish, are near 180 degrees between them and the feed horn, this results in self-cancellation of the specific frequency.
For countering the effect, there are several techniques, either in construction of the reflectors or lenses, or in the way signal beams are concentrated. In Satellite antennas, scalar rings are used to push the spread signal into the feed horn.
Read more about this topic: Focal Cloud
Famous quotes containing the words satellite, dish and/or effects:
“Books are the best things, well used; abused, among the worst. What is the right use? What is the one end, which all means go to effect? They are for nothing but to inspire. I had better never see a book, than to be warped by its attraction clean out of my own orbit, and made a satellite instead of a system.”
—Ralph Waldo Emerson (1803–1882)
“You make a toast for tomorrow
and smash the cup,
letting your false women lap the dish I had to fatten up.”
—Anne Sexton (1928–1974)
“The best road to correct reasoning is by physical science; the way to trace effects to causes is through physical science; the only corrective, therefore, of superstition is physical science.”
—Frances Wright (1795–1852)