Question

A small dipole of length l with an input current Io radiates an electromagnetic wave that is TEM respect r with an electric field given by:

E = j*w*μ*(1/2)*(Io*l/(4*pi))*e^(-jkr)/r * sinθ

Find the expression of the magnetic field, the Poynting vector, the radiated power and the input resistance of the dipole.

* Physics - bobpursley yesterday at 3:22pm

TEM? would the expression for H be identical? (except for direction?)

* Physics - Waves - AEC yesterday at 4:23pm

I think so, but the thing that blows my mind is, if it were x direction, then I would change it to y (from theory). But if it goes to the θ direction, how can I change it to direction? I mean which direction will it be?

And the Poynting vector, would be a half of it, but to what direction? I don't know how it works with non cartesian coordinates.

Thank you.



I still need help with this, can someone help? Thanks!

Answer 1

But here, if the coordinates are in a polar way, how can I change them to cartisians?