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Full-wave antenna

  1. May 27, 2013 #1
    1. The problem statement, all variables and given/known data
    antenna.JPG

    2. Relevant equations
    see attached image


    3. The attempt at a solution
    I'm not sure where to begin with this one. We did a similar problem with a half-wave antenna, where I=I_0 cos(2πz/λ) and it was centered at the origin, so cos = 1 when z = 0.
    So here I figured if we place the antenna in the positive z, then sin will = 0 when z = 0, then max out half way and decrease back to 0. But i'm not really sure.

    Could someone please nudge me in the right direction?
     
  2. jcsd
  3. May 28, 2013 #2

    TSny

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    Homework Helper
    Gold Member

    If you know the field of a single half-wave antenna, then you just need to add the fields from the two half-wave antennas that make up the full-wave antenna. You will need to take into account that the two currents in the half-wave antennas are out of phase and there is an additional phase shift due to the path difference from the antennas to the far-field observation point (like the path difference in a double-slit apparatus). Phasors are a good tool for adding the two fields.
     
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