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Antenna size – how to find it?

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  • #44298 Reply

    I am a new here. I have a problem:
    – I have to find the size of the transmitter antenna. I know:
    – frequency used: f
    – the satellite’s orbit d
    – the covered area size within the 3dB of transmitted power

    how to find the size and the gain of the antenna?? I did not find any patterns on the Internet 🙁

    #44299 Reply

    Dear Luke,
    I am assuming you are talking about parabolic antenna. Well the first thing u need to know is the required gain, which you may calculate from the link budget. Once u have that, u can use the formula
    Gain=20log (7.4 D f )

    Where D is ant dia in mtrs
    f is freq in GHz.
    Does that solve ur purpose ??

    #44300 Reply

    I know this formula. the problem is to find the Gain.
    As far as I know the link budget is:
    Pr = Pt+Gt-Lfs-Lm+Gr

    Pr, Pt – power of the receiver and transmitter (how to know them??)
    Gr, Gt – gains
    Lfs – free space loss
    Lm – other losses (which one? how to find them?)

    and I still do not know how in this problem I should use the size of the covered area (within the 3dB of transmitted power)

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