Microwave signals are used for long distance communication such as in satellite. how can these signals travel such a long distance. is it because of high fequency? or any other factor?.
2006-08-21 05:23:12 · 4 answers · asked by Anonymous in Science & Mathematics ➔ Engineering
1. microwaves canbe focussed easily using reflectors, so that these do not disperse widely. because they do not spread, the beam retains power, just like the torch beam!
2. the atmosphere offers least attenuation (wastage of power) at certain microwave frequencies, and more attenuation at other frequencies. the frequencies that are not attenuated are selected for communications
3. microwaves are chosen because their frequency is high enough to carry a very large number of information - voice, TV, computer communication channels. as a matter of fact, optical fiber communications capitalize on the large capacity (bandwidth) of the higher and higher frequncies!
4. microwaves will soon give way to optical communication!
2006-08-21 06:38:13 · answer #1 · answered by logikal 2 · 1⤊ 0⤋
Microwave And Satellite Communication
2016-12-12 16:49:21 · answer #2 · answered by ? 4 · 0⤊ 0⤋
The radiation wavelengths of the electromagnetic spectrum known as microwaves have the ability to go through most elements without being dispersed. I am referring to elements such as hydrogen, nitrogen, oxygen--things in the atmosphere. Now, true they are absorbed/dispersed/weakened by other elements like lead which is why you sometimes have to leave certain buildings to get good reception for your cell phones. But, because they go through just about every gaseous element, they can travel over long distances over our planet and through space. Because they are not dispersed when traveling through this stuff, they act as a very efficient carrier wave. Radio waves are also good, but are more affected by weather. Also, I would have to study a bit and refresh my memory, but I believe that most usable radio frequencies are taken, so a cell phone company would have to keep changing the transmission frequencies from area to area. Also, i think a waves ability to carry information is related to its frequency. Since microwaves have a higher frequency/shorter wavelength, they can carry more information. So, it's a combination of what the FCC gave to cell phone companies and they ability of the freq's to caryy info.
2006-08-21 07:11:13 · answer #3 · answered by quntmphys238 6 · 1⤊ 0⤋
The main reason is its cheep, a magnetron is very inexpensive… low depression rate, and can pass through many light obstructions like clouds
2006-08-21 11:31:56 · answer #4 · answered by Anonymous · 0⤊ 0⤋