https://www.amazon.com/Microwave-Engineering-David-M-Pozar/dp/0470631554?ref=d6k_applink_bb_dls&dplnkId=431d5e60-c3d0-406a-a82d-2b74c42edc2e
If you need to learn more about microwaves you should read this:
http://www.amazon.com/Microwave-Engineering-David-M-Pozar/dp/0470631554