A radio-frequency filter with at least one dielectric multi-mode resonator is provided. The resonator includes a metal housing with a top surface, a bottom surface, four sectors between the top and bottom surfaces, and including a resonator cavity therein. The resonator further includes a dielectric body positioned inside the cavity, the dielectric body having a first thickness between the top and bottom surfaces of the cavity, wherein there is a gap between the sectors of the housing and the dielectric body, the dielectric body including a hollow on the surface facing the top surface of the housing and on the surface facing the bottom surface of the housing, the dielectric body thus having a second thickness at the location of the hollows, the second thickness being smaller than the first thickness.

A dielectric resonator includes a dielectric substrate, a distributed element, and a shield conductor portion. The distributed element extends in the X-axis direction inside the dielectric substrate. The shield conductor portion is on a surface of the dielectric substrate and winds around the distributed element when the distributed element is viewed from the X-axis direction in plan view. One end of the distributed element is not connected to the shield conductor portion. The distributed element includes a plurality of conductors.

Provided is a dual-band resonator which can be downsized further than conventional ones. A dual-band resonator is provided with a first conductor and a second conductor. The first conductor is configured to be folded at a first folding part at the center so that both extensions are in a prescribed direction and adjacent to one another with a prescribed space therebetween, wherein a conductor part closer to one end side than the first folding part and a conductor part closer to the other end side than the first folding part are further folded at second folding parts between the one end and the first folding part and between the other end and the first folding part, respectively, in a direction in which the one end and the other end are apart from each other. The second conductor extends in a prescribed direction contiguously to the first folding part of the first conductor. The first conductor constitutes a half-wavelength resonator, and odd-mode resonance occurs in the first conductor. The first conductor and the second conductor constitute a half-wavelength resonator, and even-mode resonance occurs in the first conductor and the second conductor.

The disclosure provides a high-Q triple-mode cavity dielectric resonant hollow structure and a filter with the dielectric resonant structure. The structure includes a cavity and a cover plate, wherein the cavity is internally provided with a cube-like dielectric resonance block and a dielectric support frame; the cube-like dielectric resonance block and the dielectric support frame form a triple-mode dielectric resonance rod; air is arranged between the triple-mode dielectric resonance rod and an inner wall of the cavity; one end or any end of the cube-like dielectric resonance block is connected with the dielectric support frame respectively; the dielectric support frame is connected with an inner wall of the cavity; and the cube-like dielectric resonance block forms triple-mode resonance in directions of X, Y and Z-axes of the cavity.

A microwave resonator comprising a hollow tube comprising an electrically conductive tube wall which defines a tube bore, the tube extending along a length axis from a first end to a second end; a first electrically conductive closing plate closing the first end of the tube, the first electrically conductive closing plate comprising at least one coupling slot extending therethrough; a second electrically conducting closing plate closing the second end of the tube, the second electrically conductive closing plate comprising at least one coupling slot extending therethrough; a plurality of dielectric resonant pucks, each puck comprising first and second end faces and a side wall extending therebetween, each puck being dimensioned such that when in the tube its dominant mode is a doubly degenerate mode; the pucks being arranged within the tube bore spaced apart from each other and the closing plates, each puck being arranged centered on the length axis and its side wall abutting the tube wall such that there is no air gap between the puck and the tube wall which extends from one end face to the other of the puck, the puck adjacent to the first closing plate being termed the input puck; each puck being separated from the adjacent puck in the tube bore by a coupling gap, each coupling gap having an electrically conductive iris plate arranged therein, each iris plate being arranged normal to the length axis, each iris plate comprising at least one coupling slot extending therethrough; a single mode input microwave resonator adapted to provide a microwave signal to the input puck; each puck comprising a symmetry breaking structure for modifying the frequency of one of the degenerate modes relative to the other and the coupling between the two modes; each puck further comprising a central aperture extending from one end face to the other along the length axis; and, each central aperture comprising at least one electrically conductive insert arranged therein.

The present disclosure presents a dual-channel filter based on a dielectric resonator, which includes a metal cavity, a dielectric resonator, two tuning metal probes, and four feeding metal probes. The dielectric resonator is disposed at the center of the metal cavity. The four feeding metal probes are disposed around the metal cavity, and coupled to the dielectric resonator. The two tuning metal probes are connected to the metal cavity, and respectively located at a central position directly above and below the dielectric resonator. The dual-channel filter integrates two channel filters with good isolation between them, and has two input ports and two output ports.

This application provides a dielectric resonator, including a dielectric body disposed in a hollow conductive housing, where the dielectric body includes a first end face and a second end face that are disposed opposite to each other and a circumferential surface connected between the first end face and the second end face. The first end face is provided with a first groove, the second end face is provided with a second groove, the first end face and the second end face are in contact with an inner wall of the conductive housing, and extension directions of the first groove and the second groove are different. This application further provides a filter. This application can implement single-sided installation of the dielectric resonator, so that an objective of miniaturization is achieved and assembly becomes easy. In addition, coupling between resonance modes can be enhanced because the extension directions of the first groove and the second groove are different.

A dielectric filter with a first radio frequency (RF) passband and a second RF passband, a radio unit, an antenna unit and a base station are disclosed. According to an embodiment, the dielectric filter (1) comprises a body (2) with a plurality of resonators (201, 202, 203, 204, 205) including a first resonator (202), a second resonator (204) and a common resonator (203). The common resonator (203) is coupled under its first resonance mode to the first resonator (202) to provide the first RF passband, and is coupled under its second resonance mode to the second resonator (204) to provide the second RF passband.

The present disclosure relates to a triple-mode resonator, comprising: a main body made of a dielectric material and having a cuboid shape defining three orthogonal axes (x, y, z) substantially aligned with faces of the main body; and a conductive coating covering all of the main body except portions of the faces of the main body which defines at least one coupling aperture through which a signal can be coupled into and/or out of the main body, wherein the coupling aperture has a closed shape comprising a first and a second main edges extending along two of the axes respectively and a third main edge extending neither parallel nor perpendicular to the first and second main edges, the general shape and size and location of the coupling aperture is mainly determined by the first, second and third main edges, and the coupling aperture is configured in such a manner that desired three dominant resonance modes can be excited independently in the resonator by an input signal introduced therethrough.

A dual-band filtering switch based on a single quad-mode dielectric resonator (DR) includes: a first printed circuit board (PCB) provided thereon with an input terminal; a second PCB provided thereon with an output terminal; a shielding shell arranged between the first and second PCBs and enclosing a shielding cavity together with the first and second PCBs; and a single quad-mode DR arranged in the shielding cavity. The first and second PCBs each include a feeding layer, a dielectric layer, and a ground layer that are stacked in sequence. The feeding layers of the first and second PCBs each include a microstrip line and a switching circuitry connected to the microstrip line, and the feeding layer is in contact with a surface of the DR to realize a switching function of the filtering switch. The proposed filtering switch feature low loss transmission and high selectivity with dual-band operation, miniaturization with the fewest resonators and friendly-integration, simultaneously.