FIELD: radio engineering. SUBSTANCE: resonator has reflector and section of folding geometry made up of two waveguides ganged up with the aid of optical system including at least two mirrors. Mirrors of optical system are manufactured in the form of quadratic phase correctors. Distances between correctors proper, between correctors and butts of waveguides, dimensions of cross-sections of waveguides, maximum and minimum lengths of waves of working range are selected from condition of realization of certain relations. In addition resonator can have at least one flat mirror. EFFECT: enhanced operational efficiency. 2 cl, 2 dwg
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