Planar Antenna Sims
I have some planar antennas on an IC substrate and would like to look at the radiated power broadside (into air) vs that which is sent into the substrate and radiates out the back. I tried using two infinite sphere radiation boundaries - one covering the upper hemisphere, and one covering the lower hemisphere. (My antenna feed is at 0,0,0 and suspended on a substrate that extends in the -z direction).
The first hemisphere extends from phi:-180 to 180, theta:0 to 90
The second hemisphere extends from phi:-180 to 180, theta:90 to 180
I have a PML boundary around the entire antenna.
I get exactly the same values of all the antenna parameters (except front to back ratio) for both cases. Should this method be working? If not, what other methods would? I am yet to try integrating the Poynting vector across the hemisphere. Also, what surface would I need to use to do this integration?