can anyone help me out please......

[Ken Van]

Hi. All.

I have a problem on my homework. i couldn't solve it. Can anyone
help me please?....

here is the problem.

an antenna array consists of two infinite plane parallel sheets in the
xy plane spaced half a wavelength apart and having surface current
densities

Js1 = - Js0 coswt i z = 0
Js2 = Js0 sinwt i z= Lambda/2

the electromagnetic wave is propagating in vacuum. The time average
of the Poynting vector is required to be 500 W/(m*m) to the right of
the second antenna (z > Lambda/2). What surface current Js0 is
needed?

This problem is on the Electical engineering---electromagnetic
radiation course.

Please, if anyone solve this problem can you email to
ken...@hotmail.com

Thank you.....