Microwave Transmission Line Frequency Discriminators

New types of microwave frequency discriminators are proposed for the narrow band as well as wide-band applications. An example of branch-line hybrid type with 5% operation bandwidth is presented at 4.94 GHz. A bridge type wide-band frequency discriminator is realized using microstrip lines and slot-lines. An experimental discriminator has 50% band-width, which shows good agreement with the theory.