The present invention relates to a multi-mode resonator comprising: a housing in which a cavity corresponding to a substantially single accommodating space is arranged; and multiple resonance ribs which are arranged at a predetermined interval therebetween in the cavity, have lower ends fixed to a floor surface of the housing, have upper ends facing each other, and generate a resonance signal by multiple coupling therebetween.

The present invention relates to a multimode resonator comprising: a housing provided with a cavity substantially corresponding to one accommodation space; a plurality of resonance arms arranged at preset intervals from each other in the cavity and generating resonance signals by complex mutual coupling; and a plurality of resonance legs for respectively supporting the plurality of resonance arms.

A waveguide filter including a coupling window for generating negative coupling includes: a plurality of resonators including a substrate block; and the coupling window provided between the plurality of resonators for coupling, wherein a length of a dimension element of the coupling window is equal to or greater than half a working wavelength of the waveguide filter. The waveguide filter may reverse a coupling polarity between resonators to generate negative coupling.

A millimeter wave filter fine-tuning structure includes a resonant cavity, a fine-tuning cavity disposed at the edge of the resonant cavity, a fine-tuning cavity coupled to the resonant cavity, and plural adjusting screws disposed and inserted in the fine-tuning cavity, and the distance between the adjusting screws and the resonant cavity may be used to adjust the resonant frequency of the filter.

An apparatus includes a filter. The filter includes a metal structure forming a cavity and includes a ceramic block, which is suspended in the cavity. The ceramic block has two removed portions, the removed portions removed from two opposing sides of the ceramic block. The ceramic block further has one or more slots that that span a region of ceramic between the two removed portions and connects chambers formed by the two regions with chambers formed by the one or more slots, wherein a combined structure of the ceramic block, cavity, and metal structure supports multiple fundamental TM modes and one fundamental TE mode. The filter comprises multiple coupling structures to couple radio frequency signals into and out of the filter. The apparatus may include multi-cavity filters including one and typically multiple ones of the filters.

An RF filter includes: an electrical conductor defining an outer sphere; a dielectric material defining an inner sphere disposed within the conductor outer sphere; and at least a first electrical probe and a second electrical probe. Each probe extends through the conductor and is electrically insulated from it. A spherical shape of one or both of the inner and outer spheres is interrupted by: a) a first localized discontinuity in said spherical shape disposed along a first axis passing through a geometric center of the one or both of the inner and outer spheres; and b) a second localized discontinuity in said sphere form disposed along a second axis passing through the geometric center, the second axis perpendicular to the first axis. There can be more than these two discontinuities, implemented as chamfers, tuning screws, and the like. Series and parallel coupling of the spheres is detailed.

An apparatus includes a measurement structure for performing measurements of an RF device. The measurement structure includes an aperture in a conductive surface of the RF device and a conductive projecting region projecting into the aperture from a conductive perimeter of the aperture and electrically connected to that conductive perimeter. The aperture has a similar width in all dimensions. A combined shape of the aperture and the conductive projecting region does not possess even rotational symmetry about a point where a signal conductor will be placed on the conductive projecting region in order to conduct RF energy between the measurement structure and an external measurement instrument for performing the measurements. The measurement structure may be used for performing measurements of a multimode resonator, the measurements comprising one or more of resonant frequencies and quality factors of resonant modes of the resonator.

A dual mode cavity filter installed aboard a satellite having a first and a second waveguide cavity, a first coupling waveguide iris having an input slot and followed by the first waveguide cavity, a second coupling waveguide iris having a coupling slot, following the first waveguide cavity and followed by the second waveguide cavity, and a third coupling waveguide iris having an output slot and following the second waveguide cavity. The dual mode cavity filter is associated with a plurality of devices having at least one respective commanded rod having a certain insertion length with respect of the waveguide cavities and of the slots. The devices are placed in predetermined positions of the cavities and/or of the irises and are arranged to perform a tuning modification and/or a coupling modification of the filter by controlling the insertion length of the rods in outer space.

Disclosed is a tunable low-pass filter using a dual mode including a cylindrical cavity configured to trigger a resonant mode, a plurality of irises formed on a lateral face of the cylindrical cavity, and a dummy iris formed on the lateral face of the cylindrical cavity, wherein the resonant mode includes a plurality of modes having a plurality of resonant frequencies, and differences in resonance frequency between the plurality of modes are determined based on angles between the plurality of irises based on an axis of the cylindrical cavity.

A multi-mode cavity filter, including at least one dielectric resonator body incorporating a piece of dielectric material having a shape to support first resonant mode and a second substantially degenerate resonant mode; excitation device(s) for at least one of: establishing an electromagnetic field external to, but immediately adjacent to, a face of the dielectric resonator body or for extracting energy from an electromagnetic field located external to, but immediately adjacent to, a face of the dielectric resonator body, a layer of conductive material in contact with and covering the dielectric resonator body on the face of the dielectric resonator body: at least one aperture in the layer of conductive material for inputting signals to the dielectric resonator body and/or outputting signals from the dielectric resonator body, wherein the excitation device is located, in at least two dimensions, at an electrical center of the face of the dielectric resonator body.