Embodiments of this application provide a dual-mode resonator, a filter, and a radio frequency unit. The dual-mode resonator includes a cavity and a dual-mode dielectric body coupled to an inner surface of the cavity. The dual-mode dielectric body includes a central part and four components that protrude from the central part, where the four components are disposed opposite to each other in pair and are in a cross shape, and a. A first coupling groove and a second coupling groove are provided on the central part, where an extension direction of the first coupling groove is between two adjacent components, and an extension direction of the second coupling groove is between the other two adjacent components. The widths and/or the depths of the first and the second coupling grooves are different, and the extension direction of the first coupling groove and the extension direction of the second coupling groove are at a preset angle.

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.

Systems and methods which provide filtering dielectric resonator antenna (FDRA) configurations implementing radiation cancellation are disclosed. Embodiments of a FDRA provide implementations of dielectric resonator antennas (DRAs) which are configured with a loop feed structure facilitates radiation cancellation to provide radiation nulls at frequencies outside of a desired passband to thereby implement radiation cancellation for filtering functionality of the FDRA. FDRAs of embodiments may be variously polarized, such as to provide linear polarization or circular polarization.

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.

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.

A tunable dual-band resonator and a tunable dual-band band-pass filter using the tunable dual-band resonator. The dual-band resonator is structured such that a stub is added to each half-wavelength resonator provided with half-wavelength resonator protrusions (capacity-component adjust parts). The dual-band resonator is made up of an odd-number mode resonator in a shape including a ground conductor disposed on the back surface of a dielectric body, and a strip conductor disposed on the top surface thereof, and an even-number mode resonator in such a shape as to be formed when the stub is connected to an end face on the opposite side of the open-end of the strip, characterized in that a dielectric rod having a circular cross section is provided in the space above the respective stubs and another dielectric rod having a circular cross section is provided in the space above the half-wavelength resonator protrusions.

Disclosed are a high-Q multi-mode dielectric resonant structure and a dielectric filter. The high-Q multi-mode dielectric resonant structure includes a cavity, a dielectric support frame, a dielectric resonator and a cover plate, and the cavity is formed by a sealed space, herein one surface of the cavity is a cover plate surface; the dielectric resonator is formed by a medium; and the dielectric support frame is mounted in any positions between the dielectric resonator and an inner wall of the cavity, matched with any shapes of the dielectric resonator and the cavity and fixed by connecting, and the ratio of the dimension of the inner wall of the cavity to the corresponding dimension of the dielectric resonator corresponding to three axial directions thereof is between 1.01-4.5. Embodiments of the present invention may solve a scheme that the filter is small in volume, low in insertion loss, and high in suppression, and may form a multi-mode, and a Q value is greater than that of a traditional dielectric multi-mode technology.

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.

The present disclosure relates to a substrate that includes a substrate body and a resonator integrated within the substrate body. The resonator includes a resonator body, a top resonator plate, and a bottom resonator plate. The resonator body extends through the substrate body from a top surface to a bottom surface of the substrate body, and is formed of at least one of a dielectric material and a magnetic material. The top resonator plate is coupled to a top side of the resonator body and resides over the top surface of the substrate body, and the bottom resonator plate is coupled to a bottom side of the resonator body and resides over the bottom surface of the substrate body. The top resonator plate and the bottom resonator plate are electrically conductive.