Hi mirok
As far as I know, 300W is a huge power which cannot be handled by microstrip antenna substrates.....
I suggest you call any manufacturer like Rogers corporation and find out if at all any substrates exist..
Regards n best wishes
Hi Raymondli,
I just read your question.
As you said PIFA is a kind of microstrip antenna, the main beam occurs in the broadside, i.e., perpendicular to the the patch.
Ephi is defined as thetha constant and phi varied from -180 to +180 degrees. Assume thetha some values and vary phi and you...