A waveguide filter having a core including an external face and internal faces defining a channel for filtering and guiding the waves. The channel includes several slots, each having a first and a second face. The first face is inclined in relation to the second face. A method for manufacturing the waveguide filter.

A passive device comprising a hollow waveguide including first and second wall structures extending in a guiding direction, an interconnecting base extending between the wall structures and an enclosure extending between the wall structures, the enclosure being located opposite the interconnecting base; and at least one array of coupled resonant structures enclosed inside the waveguide, the array being configured to provide coupled local resonators and a microwave or millimeter wave frequency passband for providing at least one selected microwave or millimeter wave signal, the array extending along the guiding direction and being located between the wall structures. Each resonant structure extends from the interconnecting base into the hollow waveguide to define a microwave or millimeter wave subwavelength resonant structure, and successive resonant structures are separated by a microwave or millimeter wave subwavelength distance. A resonance frequency of the resonant structures is less than a cut-off frequency of the waveguide.

A waveguide device includes: a first conductive member having a first conductive surface; a first waveguide member having a first waveguide face opposing the first conductive surface; a plurality of first conductive rods on both sides of the first waveguide member; a second conductive member having a second conductive surface; a second waveguide member having a second waveguide face opposing the second conductive surface; and a plurality of second conductive rods on both sides of the second waveguide member. A first waveguide gap exists between the first waveguide face and the first conductive surface. A second waveguide gap exists between the second waveguide face and the second conductive surface. One end of the first waveguide gap is connected to the second waveguide gap, and at a connecting portion therebetween, the first waveguide face extends in a direction that intersects a plane which is parallel to the second conductive surface.

A multi-mode resonator is provided. The multi-mode resonator includes a housing and a cavity disposed in the housing, wherein the cavity includes a main cavity and a plurality of first subcavities disposed on a first lateral side of the main cavity.

A hybrid-harmonic waveguide filter includes transformer sections at end terminals of the harmonic waveguide filter, a number of corrugations along the length of the waveguide filter, and multiple ridge interconnects that couple the corrugations. By shaping the identical-cross-section ridge interconnects via single-pass wire electrical-discharge machining (EDM), low manufacturing cost is achieved along with continuous broadband rejection of TEn0 modes and an extremely high-power handling capability is observed.

A hybrid-harmonic waveguide filter includes transformer sections at end terminals of the harmonic waveguide filter, a number of corrugations along the length of the waveguide filter, and multiple ridge interconnects that couple the corrugations. By shaping the identical-cross-section ridge interconnects via single-pass wire electrical-discharge machining (EDM), low manufacturing cost is achieved along with continuous broadband rejection of TEn0 modes and an extremely high-power handling capability is observed.

A tunable microwave system includes at least two elements, each element being chosen from a propagating guide, an evanescent guide, a resonator, and at least one coupling device arranged between the two elements and configured to couple the two elements to each other, the coupling device having a holder having an aperture and having at least one elongate element the shape of which is elongate in a polarization direction contained in a plane of the aperture, the elongate element being securely fastened to the perimeter of the aperture at at least one end, the coupling device being configured to be rotatable about an axis substantially perpendicular to the plane of the aperture so as to modify a value of the polarization direction and so that the coupling between the two elements is dependent on the value of the polarization direction.

A tunable microwave system includes at least two elements, each element being chosen from a propagating guide, an evanescent guide, a resonator, and at least one coupling device arranged between the two elements and configured to couple the two elements to each other, the coupling device having a holder having an aperture and having at least one elongate element the shape of which is elongate in a polarization direction contained in a plane of the aperture, the elongate element being securely fastened to the perimeter of the aperture at at least one end, the coupling device being configured to be rotatable about an axis substantially perpendicular to the plane of the aperture so as to modify a value of the polarization direction and so that the coupling between the two elements is dependent on the value of the polarization direction.

A plurality of waveguide structures are loaded on a top surface opposed to a bottom surface of a metal case, on which a high-frequency circuit is mounted, a height, a width, and a length of each of the plurality of waveguide structures have dimensions corresponding to a quarter-wave of a cutoff frequency indicating a frequency band of a target electromagnetic wave to be blocked, and a width and a length of each of the plurality of waveguide structures have dimensions that allow only a high-frequency wave of a mode to propagate in the frequency band.

A multipaction-proof waveguide filter includes a main cavity and a number of corrugations extending from the main cavity. The main cavity includes corrugation interconnect regions between the plurality of corrugations. The corrugation interconnect regions include sloped surfaces, and the corrugations include flared nonparallel sidewalls. Due to the introduced sloped surfaces and flares, an increased Q is achieved, improved roll off is observed and multipaction risks are mitigated.