2006-11-26 01:29:49 · 3 answers · asked by amindaie 3 in Science & Mathematics ➔ Engineering
An antenna has no power in it. It is a "passive" device. The effectiveness of the antena depends upon it's phsyical characteristics and the first electronic amplifier it is connected to.
An antenna has a specific frequency that it is most effective in capturing. That length is usually a multiple of the wavelenth of the target frequency. Typically an antenna that is equal to 1 wavelength is the most effective. But this is not practical at lower frequencies where the wavelength is very long.
So the coupling between the antenna and the first electronic amplifier is critical. The technology is well established and therefore, you can purchase good antennas. What is more important however is the physical location. Radio signals are interrupted or interferred with by buildings and landscape. So having an antenna that is unobstructed is the best way to improve reception. However you have to weigh the location against the distance to the radio or tv or other device, as this will cause signal loss over longer distances.
2006-11-26 04:06:17 · answer #1 · answered by richard Alvarado 4 · 0⤊ 0⤋
In VHF and UHF regions of Spectrum Parabolic Antennas are used. For TV reception Yagi Antennas are also popular. You find details for their construction in Text Books like
Antennas - J.D.Krauss
Antennas - R.E.Collin
Electromagnetic Fields and Radiating Systems - Jordan and Balmian
http://members.shaw.ca/weskyscan/Antennas.htm
2006-11-26 03:25:07 · answer #2 · answered by Ravi Kiran 1 · 0⤊ 0⤋
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2016-12-17 16:27:13 · answer #3 · answered by ? 4 · 0⤊ 0⤋