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Dipole radiation pattern - why is there a null

 
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Lucas
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PostPosted: Thu Nov 10, 2016 4:00 pm    Post subject: Dipole radiation pattern - why is there a null Reply with quote

Anyone knows why is there a null in dipole's radiation pattern. Lets say there is a dipole oriented along z axis. I understand that the way the H_phi and the E_theta are distributed the cross product and therefore the Poynting vector is zero along the z axis. However, I am not sure exactly what is the underlying physics?
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