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Dipole antennas & Conductivity

  1. Feb 27, 2012 #1
    Hello!

    I have two quick (hopefully) questions about dipole antennas and conductivity.

    1) Two dipole antennas are placed at the points (λ/4,0,0) & (-λ/4,0,0) where λ is the wavelength of the emitted radiation. The dipole moments are:

    p1 = p_ω *e^(-ωt)
    p2 = p_ω *e^(-(ωt-α))

    where p_ω is constant, ω is the angular frequency and α is the phase-shift between the two antennas.

    And now for the question, if α = 0, do the two antennas amplify or thwart the radiation along the y-axis? the x-axis? How do you rotate the radiation zone 90 degrees?

    2)

    Suppose you have some sort of conductive body with a charge density of ρ (free particles) at t = 0. qualitatively how do the particles redistribute on the body, and if there's a net charge on the body, where do the charged particles go and what happens? Also what happens with the charge distribution inside the body for t > 0?


    My thoughts:

    1)

    On the first two questions I have a feeling that it amplifies along the y-axis and thwarts the radiaton along the x-axis, why though I am not sure. As for the last question, I suspect you just change the distance between the antennas, but I'd love some explanation on how to.

    2)

    Pretty lost on this one, would reallui appreciate som help.



    Thanks!
     
  2. jcsd
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