Abstract: The invention relates to a quadruple mode microwave filter having coupled cavities with a plurality of transmission zeros, said filter comprising at least one rectangular parallelepiped-shaped quadruple mode cavity, at least two rectangular irises, and two input/output waveguides. Tuning and coupling of the filter are obtained exclusively by the dimensions and mutual disposition of the at least one resonant cavity and the irises, without any screw or other tuning mechanism. All the faces of the cavities and the irises are either parallel or perpendicular to each other. In a preferred embodiment the irises are offcentered along the two transverse axes. According to one advantageous feature, the input mode and the output mode are the same, preferably the TE 10 fundamental mode.

Abstract: The invention relates to a quadruple mode microwave filter having coupled cavities with a plurality of transmission zeros, said filter comprising at least one rectangular parallelepiped-shaped quadruple mode cavity, at least two rectangular irises, and two input/output waveguides. Tuning and coupling of the filter are obtained exclusively by the dimensions and mutual disposition of the at least one resonant cavity and the irises, without any screw or other tuning mechanism. All the faces of the cavities and the irises are either parallel or perpendicular to each other. In a preferred embodiment the irises are offcentered along the two transverse axes. According to one advantageous feature, the input mode and the output mode are the same, preferably the TE 10 fundamental mode.

Abstract: An injector device for microwave filter units made up of channel filters (1″, 1″′) provided with cavities housing dielectric resonators. Each filter has an input cavity which receives a signal transmitted by a coaxial cable terminating at a connector (15″, 15″′) mounted through a wall closing the cavity at an input end of the filter. The injector device of a filter acts electrically on a dielectric resonator accommodated in the input cavity via a probe (16) consisting of a L-shaped rod having a first portion connected to the core of the coaxial cable to extend it into the cavity and a second portion acting on a dielectric element (13) of the resonator via electrical coupling means. The invention also relates to filter units equipped with such injector devices.

Abstract: A microwave resonator, in particular for a filter, comprising a resonant cavity having positioned therein a plane resonator element, frequency tuning means, and intermode coupling means, the resonator element being made of a dielectric material that is at least approximately in the shape of a parallelogram and being disposed transversely in the cavity in such a manner that the vertices of the parallelogram are short-circuited to one another by the conductive inner wall of said cavity. The resonator has at least one other plane resonator element made of dielectric material in a shape that is at least approximately that of a parallelogram, the resonator elements being placed close together, mutually parallel, and extending transversely to a central axis of the cavity. The frequency tuning means and the intermode coupling means are positioned between the parallel resonator elements.

Abstract: An injector device for microwave filter units made up of channel filters (1″, 1″′) provided with cavities housing dielectric resonators. Each filter has an input cavity which receives a signal transmitted by a coaxial cable terminating at a connector (15″, 15″′) mounted through a wall closing the cavity at an input end of the filter. The injector device of a filter acts electrically on a dielectric resonator accommodated in the input cavity via a probe (16) consisting of a L-shaped rod having a first portion connected to the core of the coaxial cable to extend it into the cavity and a second portion acting on a dielectric element (13) of the resonator via electrical coupling means. The invention also relates to filter units equipped with such injector devices.

Abstract: A microwave resonator, in particular for a filter, comprising a resonant cavity having positioned therein a plane resonator element, frequency tuning means, and intermode coupling means, the resonator element being made of a dielectric material that is at least approximately in the shape of a parallelogram and being disposed transversely in the cavity in such a manner that the vertices of the parallelogram are short-circuited to one another by the conductive inner wall of said cavity. The resonator has at least one other plane resonator element made of dielectric material in a shape that is at least approximately that of a parallelogram, the resonator elements being placed close together, mutually parallel, and extending transversely to a central axis of the cavity. The frequency tuning means and the intermode coupling means are positioned between the parallel resonator elements.