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The continuous growth in the range of the present electronics is guided by the progress of devices that are used for locating air objects, which "show'' their position by emitting a very short electronic impulse of the order of a few nanoseconds. Owing to the specification of the effect, one of the best circuits that help to determine the object's location is the microwave phase discriminator. This work presents a general principle of a classic functioning version of the discriminator with ring detectors. A newer version of the discriminator that is characterized by symmetry in structure, lower level of phase detection's errors and operation in a wider frequency band (than a classic version) was also proposed.