Good for student and reseacher in microwaves
Very good basic book for beginners and advanced students in microwaves.
Moreover is a coplete reference book for researchers and workers in microwaves.
It is easier (less formulas and more pragmatic) and newer (it has written after) than classic Collin's microwave book. Respect to that book is more complete when planar waveguides (e.g. microstrip lines, coupled lines, coplanar lines) are discussed.