The following your post is completely same as this post.
http://www.designers-guide.org/Forum/YaBB.pl?num=1265698372Don't do multiple post of same contents.
avins wrote on Feb 8th, 2010, 10:49pm:I am doing work on Microwave transitions;
I need help in preparing my thesis report which is titled “Stripline to Microstrip transition using Multilayer boards.
This is a NASA technical paper. You can Google this to know more.
This is basically proximity feed array antenna or back feed array antenna which are fairly classical and already established theme in microwave or antenna society.
Classically and actually this problem was analyzed extensively by full-wave analysis based on moment method in ancient days.
avins wrote on Feb 8th, 2010, 10:49pm:I would also like why there is so less information available about transitions,
Search technical papers of IEEE Microwave Theory Technique or IEEE Antenna&Propagation over 1980~1992.
You can find out many many papers on this topics.
Also see papers and books by "David. M. Pozar" who are very famous professor in this field.