A non-reciprocal microwave component comprising at least three waveguides and a central resonator, characterized in that the central resonator comprises an upper substrate and a lower substrate extending on either side of a resonance volume for propagating electromagnetic waves, each of the upper substrate and the lower substrate comprising a dielectric layer having an outer face and an inner face opposite one another, the outer face being covered by an outer conductive layer and the inner face being covered by an inner conductive layer, the inner face of the dielectric layer of the lower substrate being oriented toward the inner face of the dielectric layer of the upper substrate, the upper substrate further comprising a plurality of vias extending, through the associated dielectric layer, between the corresponding outer conductive layer and inner conductive layer, and being in electrical contact with said outer conductive layer and inner conductive layer at connection points, the connection points of the inner conductive layer enclosing a free surface of the inner face of the dielectric layer, the free surface not being covered by the inner conductive layer, a single magnetized ferromagnetic ceramic element being arranged between the free surface of the upper substrate and the lower substrate, each waveguide extending along a respective propagation axis (X-X), each waveguide comprising a propagation zone for propagating electromagnetic waves, the central resonator and each waveguide being arranged so that electromagnetic waves can circulate between the resonance volume of the central resonator and the propagation zone of each waveguide. characterized in that the central resonator comprises an upper substrate and a lower substrate extending on either side of a resonance volume for propagating electromagnetic waves, each of the upper substrate and the lower substrate comprising a dielectric layer having an outer face and an inner face opposite one another, the outer face being covered by an outer conductive layer and the inner face being covered by an inner conductive layer, the inner face of the dielectric layer of the lower substrate being oriented toward the inner face of the dielectric layer of the upper substrate, the upper substrate further comprising a plurality of vias extending, through the associated dielectric layer, between the corresponding outer conductive layer and inner conductive layer, and being in electrical contact with said outer conductive layer and inner conductive layer at connection points, the connection points of the inner conductive layer enclosing a free surface of the inner face of the dielectric layer, the free surface not being covered by the inner conductive layer, a single magnetized ferromagnetic ceramic element being arranged between the free surface of the upper substrate and the lower substrate, each waveguide extending along a respective propagation axis (X-X), each waveguide comprising a propagation zone for propagating electromagnetic waves, the central resonator and each waveguide being arranged so that electromagnetic waves can circulate between the resonance volume of the central resonator and the propagation zone of each waveguide.