An assembly for a radio frequency filter includes: an elongate pedestal with an upper surface; a resonator; a tuning member that is positioned above the resonator; and a screw that mounts the resonator to the upper surface of the pedestal, the screw including a shank with a thread and a head, the head including a plurality of recesses configured to receive a tool, the recesses extending through the head.

A filter comprising a flexible PCB with one or more signal tracks on one side. A electromagnetically absorbing material covers the signal tracks. An insulating material may be provided between the signal tracks and the electromagnetically absorbing material. The PCB is then folded or rolled to take up less space. The PCB may be first folded and then rolled to have both ends of the signal tracks available at the outer portion of the roll.

A modular filter system includes a front panel, a back panel, and a multiband combiner coupled to the front panel, the combiner including an antenna connector and filter connectors. The modular filter system further includes filter modules separate from the combiner, each filter module including first and second connectors to pass respective frequency bands, and a combiner connector to pass the frequency bands. Each filter module is configured to duplex, combine, or split first signals in the first frequency band and second signals in the second frequency band. The combiner connector of each filter module is coupled to a respective filter connector using a respective cable. The modular filter system further includes a fixing system comprising bars and plates, the bars coupled to the front and back panels using fasteners, wherein the bars and plates are configured to secure the filter modules between the combiner and the back panel.

Waveguide filters comprising ridges disposed within a waveguide cavity for selecting electromagnetic signals within a frequency passband. An apparatus includes a waveguide filter comprising a waveguide cavity and a plurality of ridges disposed within the waveguide cavity. The apparatus is such that each of the plurality of ridges comprises a first side and a second side, and wherein the first side and the second side are disposed at a non-orthogonal angle relative to one other. The apparatus is optimized for fabrication using metal additive manufacturing techniques.

An LTCC integrated circuit mold unit includes an integrated mold formed by multiple circuit mold units which are superposed, electrodes sheathed in the integrated mold and conductive wire sections sheathed in the integrated mold. Each circuit mold unit is formed by a ceramic base with an electrode pattern recess and a through hole. A denting depth of the electrode pattern recess is between 0.5 μm and 5000 μm. The through hole penetrates through the ceramic base. An inner diameter of the through hole is above 10 μm. The electrode pattern recess is filled with a conductive material to form one of the electrodes. Each through hole is filled with the conductive material to form one of the conductive wire sections. The conductive wire sections which are vertically adjacent are connected to form a conductive path. The conductive path electrically connects to at least one of the electrodes.

A method of fabricating and tuning a surface integrated waveguide (SIW) filter incudes covering upper and lower surfaces of a dielectric substrate with a metallic layer. The method includes drilling a plurality of vias on the dielectric substrate and covering the vias with the metallic layer, wherein a first group of vias forms one or more cavity resonators, a second group of vias defines coupling channels between the cavity resonators, a third group of vias defines an effective width and a fourth group of vias defines an effective length of the cavity resonators. The method includes varying a center frequency by increasing diameters of the second group of vias to decrease the width of the coupling channels and varying a roll-off by increasing diameters of the third and fourth groups of vias to decrease the effective width and the effective length of the resonators.

A filter in a wireless communication system includes: a cover; a housing; a printed circuit board (PCB); a resonance plate provided between the cover and the PCB; and a plurality of resonators provided on a single layer in the resonance plate.

An apparatus comprising: at least one cavity filter element wherein the cavity filter element comprises a first support, a second support distinct from the first support, and a coupling element supported by the first support and the second support. In some examples, there is a series of cavity filter elements. In some examples, the cavity filter element(s) are part of a cavity filter.

A method of manufacturing a ceramic resonator radio frequency filter includes placing one or more first coaxial resonators on a printed circuit board, and placing one or more second coaxial resonators over the one or more first coaxial resonators so that the coaxial resonators are arranged in a stacked configuration on the printed circuit board. The method also includes electrically connecting the one or more first coaxial resonators and second coaxial resonators to the printed circuit board.

A filter debugging method, a device, an electronic apparatus and a readable storage medium are provided. The filter debugging method includes: step S1: inputting a current hole parameter and a current index value of a filter into a policy network which is pre-trained; step S2: determining, by the policy network, a target hole to be polished of the filter, according to the current hole parameter and the current index value of the filter; step S3: controlling a mechanical arm to polish the target hole of the filter; and step S4: determining whether the filter is qualified according to an index value of the polished filter; in a case that the filter is qualified, ending a process including the steps S1 to S4; in a case that the filter is unqualified, performing the steps S1 to S4 circularly until the filter is qualified.