Which is the best book from which I can get conceptual idea about cavity and dielectric resonators, klystron magnetron and TWT???
I have books Pozar and R E Collin and S Y Liao with me. Is there any better book?
There are many, many books about Microwaves but I would place in top of the list the book written by Joseph Carr: "Microwave & Wireless Communications Technology"
I also recommend the book from David M. Pozar - "Microwave Engineering" very good book for fundamental concepts. It was part of the books in my MCs Electrical Engineering in High Frequencies.