ANSWER: Satellite, Satellite Antenna

KRuNaL
Re: Sasmita

Satellite receiving antenna should have large aperture such that it can receive maximum signals......Means that antenna should have large beamwidth (B).......that for receiving case.....thtz in case of parabolic reflector also......okay?.....
If point to point communication between earth station n space segment is there, beamwidth should b narrow so that ther can possible maximum power radiated between those satellites......

okay......if neone here......share ideas abt thz

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RP
Re: Smita Further

My ideas are: Parabolic antenna is by far the most generic, and high gain antenna as Krunal has suggested. Best suited for long range communications. Only one that beats it is Yagi Uda and Spiral antennas in specific cases. Yagi Uda cannot be used because of its size and other limitations, although in many cases we DO use that, but then spiral goes out of the whack when there is a little shift in polarization (circular) of signal. Which by the way is extremely easy to do, with changing air density and hence changing impedence along way to space. With both these
gone, we use parabolic.

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$udipto....
sasmita: parabolic shape of rx antenna......

For a rx. antenna it is necessary to accumulate signals in a greater extent ,so that the beam area under the major beam lobe as much as possible. in parabolic reflecting antennas a property of light is being used, the reflective property. as the antenna is parabolic in nature, when signals fall in the dish, the dish reflect the signal in a converging manner. at the center of the antenna a sensor (receiver) is placed and it get the signal with high intensity... so a high accuracy signal is being received.

But, in some cases yagi uda antenna is also used as rx. , because it is mainly an array of antenna(BSA or EFA), so its efficiency can be manipulated by adjusting the no. of array elements.........again, the size of an antenna should be optimized according to its efficiency......


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Sasmita
thnx

@kk,rp thnx
@sudipto thnx 4 giving better knoweledge abt RF....(once my teacher asked
one of my frens in his seminar on such topic....why it's called radio frequency?).....

also thnx 4 the note onRx..
n yes the picturial view of ur description may found on this link
http://www.mlesat.com/antennas.html
(on d ad space)