Sketch electric field of beamed antenna.

[Spinnor]

Suppose we have an antenna which has large directional gain. Suppose the antenna broadcasts linearly polarized radiation in a narrow beam and at constant frequency. Sketch the electric field in the plane which contains both the electric field and the beam axis. Does the attached come close?

 

[Spinnor]

Will the magnetic field look similar but rotated a quarter turn about the beam axis?

Given the electric field work backwards and sketch the vector potential.

Thanks for any help!

 

[Spinnor]

We can get the sketch above by proper deformation of the electric field of a dipole?:

From:

http://www.google.com/imgres?q=dipo...&tbnw=132&start=36&ndsp=7&ved=1t:429,r:2,s:36

If we had many properly spaced and oriented dipole radiators which were on a common axis we could get the beamed radiation sketched in the first post?