Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Radiation power of an antenna

  1. May 25, 2016 #1
    I am reading Jackson's book on classical electrodynamics.
    It said in page 412 to 415 (3rd edition) that the total power radiated by a
    dipole is proportional to k^4 (equation 9.24)
    quadrupole is proportional to k^6 (equation 9.49)
    But why does the linear antenna at page 412, which is a dipole, radiate at k^2 (equation 9.29)?
     
  2. jcsd
  3. May 25, 2016 #2
    The dipole moment, p, has ω in the denominator (equation 9.27). Thus the c2|p|2 terms in 9.24 replace two of the k's.
     
    Last edited: May 26, 2016
  4. May 26, 2016 #3
    so the (real) power for a dipole should be proportional to k^2 instead of k^4 ?
     
  5. May 26, 2016 #4
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted



Similar Discussions: Radiation power of an antenna
  1. Does antenna radiate DC? (Replies: 10)

  2. How antenna radiates? (Replies: 43)

Loading...