Disclosed is a structured hybrid different-wavelength resonant ceramic filter, comprising a ceramic substrate and an input/output electrode, wherein the ceramic substrate comprises a first surface and a second surface opposite to the first surface, five first resonant cavities, two second resonant cavities and two third resonant cavities are formed between the first surface and the second surface in a horizontal direction; the five first resonant cavities are located in the middle of the first surface of the ceramic substrate, the two second resonant cavities are respectively located at both sides of the five first resonant cavities, and the two third resonant cavities are respectively located lateral relative to the two second resonant cavities. With the present disclosure, filters with various forms and functions are integrated into a multi-cavities filter, and it is simple in structure.

A microwave resonator comprising a hollow tube comprising a plurality of electrically conductive wall faces which together define a tube wall defining a tube bore, the tube extending along a length axis from a first end to a second end; the tube wall having an N fold rotational symmetry about the length axis where 2<N<10; a first electrically conductive covering plate covering the first end of the tube; a second electrically conductive covering plate covering the second end of the tube; a dielectric puck comprising first and second end faces and a side wall extending therebetween, the puck being dimensioned such that when in the tube bore its dominant resonant mode is a doubly degenerate mode; the puck being arranged in the tube bore spaced apart from the covering plates with its end faces normal to the length axis and centered on the length axis; the puck being spaced apart from the tube wall by a plurality N of electrically conductive spacer blocks, the spacer blocks being spaced equally around the length axis and spaced apart from the covering plates; and, a symmetry breaking structure adapted to modify the coupling between the two degenerate modes and also their relative frequencies.

This application discloses a filtering apparatus, including: a coupling channel distinguishing component, dividing a coupling channel between a first filtering component and a second filtering component into a plurality of independent coupling channels, and it includes a channel distinguishing component and at least one decoupling component, the channel distinguishing component is configured to divide the coupling channel into a plurality of independent channels, and the decoupling component is configured to decouple the plurality of independent channels into the plurality of independent coupling channels; and at least one adjusting component, each of the adjusting component is configured to adjust a preset coupling scheme of a corresponding independent coupling channel, each of the at least one adjusting component is located in the corresponding independent coupling channel, and each of the adjusting component is located in a corresponding projection area.

A filter comprises a dielectric resonator element and a cylindrical waveguide cavity having a corrugated tube structure that surrounds the dielectric resonator element such that an outer encircling wall surface of the dielectric resonator element is in contact with an inner sidewall of the corrugated tube structure. The corrugated tube structure includes one or more spaced-apart corrugations configured to provide a spring-like action to controllably expand and contract the corrugated tube structure so that the dielectric resonator element can be controllably inserted and clamped within the cylindrical waveguide cavity. The geometry of the spaced-apart corrugations can be selected to define a rotationally asymmetric corrugated tube structure configured to split a plurality of fundamental modes of electromagnetic waves within the filter.

A quad-mode microwave or RF bandpass filter comprises a housing of a conductive material defining a cylindrical cavity and containing a cylindrical dielectric resonator defined by a parallel pair of face surfaces. The dielectric resonator is held within the housing between a pair of support plates of a dielectric material. Internal coupling elements are provided above and/or below the dielectric resonator for coupling between resonating modes. Further mode coupling elements are protruding into the housing.

A filter comprises a dielectric resonator element and a cylindrical waveguide cavity having a corrugated tube structure that surrounds the dielectric resonator element such that an outer encircling wall surface of the dielectric resonator element is in contact with an inner sidewall of the corrugated tube structure. The corrugated tube structure includes one or more spaced-apart corrugations configured to provide a spring-like action to controllably expand and contract the corrugated tube structure so that the dielectric resonator element can be controllably inserted and clamped within the cylindrical waveguide cavity. The geometry of the spaced-apart corrugations can be selected to define a rotationally asymmetric corrugated tube structure configured to split a plurality of fundamental modes of electromagnetic waves within the filter.

The present invention relates to a cavity filter and, particularly, to a cavity filter comprising: a resonance element including a coupling block; a first case including the resonance element therein; a second case arranged so as to cover one surface of the first case; a terminal unit penetrating the first case such that one end thereof is protrudingly provided so as to be connected to an electrode pad of an external member provided on the outside of the first case and the other end thereof is electrically connected to the coupling block of the resonance element provided to be close to the second case, wherein the terminal unit is electrically insulated from the first case; and an assembly unit provided on either one side or both sides in the lengthwise direction of the case, and having a terminal insertion hole in which the terminal unit is insertedly provided, wherein the assembly unit is formed to protrude to the outside from a lower surface of the first case.

Waveguides in accordance with embodiments of the invention are disclosed. In one embodiment, a dual-mode circular waveguide includes a cavity, a first end wall including a first handedness-preserving metasurface positioned at a first end of the cavity, and a second end wall including a second handedness-preserving metasurface positioned at a second end of the cavity.

A triple-mode dielectric resonator filter includes: a dielectric resonator positioned in a cavity of a housing and formed perpendicular to a longitudinal direction of the housing; a dielectric support coupled to the dielectric resonator through a bonding process and mounted and fixed by a fixing screw passing through a screw fixing mounting hole in the cavity of the housing and fixed to support the dielectric resonator at a predetermined height; and compensation blocks formed to protrude at regular intervals on a side surface of the dielectric resonator to allow the dielectric resonator to operate in three modes. A band pass filter composed of a dielectric resonator and an NRN stub achieves an improved insertion loss, high compression properties and a stable structure compared to a typical band pass filter using an NRN stub.

A microwave resonator comprising a hollow tube comprising a plurality of electrically conductive wall faces which together define a tube wall defining a tube bore, the tube extending along a length axis from a first end to a second end; the tube wall having an N fold rotational symmetry about the length axis where 2<N<10; a first electrically conductive covering plate covering the first end of the tube; a second electrically conductive covering plate covering the second end of the tube; a dielectric puck comprising first and second end faces and a side wall extending therebetween, the puck being dimensioned such that when in the tube bore its dominant resonant mode is a doubly degenerate mode; the puck being arranged in the tube bore spaced apart from the covering plates with its end faces normal to the length axis and centered on the length axis; the puck being spaced apart from the tube wall by a plurality N of electrically conductive spacer blocks, the spacer blocks being spaced equally around the length axis and spaced apart from the covering plates; and, a symmetry breaking structure adapted to modify the coupling between the two degenerate modes and also their relative frequencies.