1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Two sets of waves in a Hertzian Dipole?

  1. May 29, 2009 #1
    In the near field, a hertzian pole has a changing electric field and a changing magnetic field, that are in both space and time quadrature. Are two sets of EM waves then created in the far field, one from the changing e-field, and one from the changing m-field?
  2. jcsd
  3. May 29, 2009 #2
    There is only one radiated wave; The radiated Poynting vector P = E x H requires both an E vector and an H vector in phase. A quadrature phase field is an induction field (like in Faraday induction, where voltage is proportional to dB/dt), and cannot radiate power. The far-field radiated wave has the E:H vector ratio of 377:1 in the mks system. The polarization is along E.
    Last edited: May 29, 2009
  4. May 29, 2009 #3
    Don't the changing induction fields create the radiating far fields, as described by Maxwell's equations?
  5. May 29, 2009 #4
    If two fields are in time (phase) quadrature, They represent energy storage, not power. The integral of [sin(wt) x cos(wt) dt] over 2 pi is zero. Consider the voltage and current for a pure inductance. They are in phase quadrature, and there is no real power.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook