Importance

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Abstract

A microwave frequency discriminator, i.e. an electronic device for directly transforming frequency modulation on a microwave carrier into a demodulated lower frequency signal. The discriminator is similar to a Travis discriminator and includes an inlet microstrip line, two resonant circuits (R.sub.1, R.sub.2) constituted by dielectric resonators and coupled to said inlet microstrip line to receive the modulated microwave signal, two outlet microstrip lines coupling each resonator to a respective microwave detector circuit, said detector circuits including loads (r.sub.1, r.sub.2) in series-opposition in the manner of a Travis discriminator. An amplitude limiter suitable for connection to the discriminator includes a three-port circulator having a first port for receiving microwaves, a third port for providing microwaves to the discriminator, and a second port intermediate the first and third ports in the direction of circulation, the second port being coupled to a synchronized oscillator.

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First Claim