Dispersion relation in a coupled microstrip line

this book can help you
http://books.electromaniacs.org/file.php?id=112

Could you be a little bit more specific. About the basics you can refer to microwave books like microwave enginnering by Pozar or foundtion of microwave engineering by Colin. If you make your need more clear, wecan help you better.

i need the dispertion relation in a microstrip line coupled

Hi

On Page 7 you will find what you are looking!

David