The present invention relates to a waveguide filter particularly including a filter housing having a plurality of resonance blocks, a plurality of resonators configured by resonator posts respectively formed on the resonance blocks provided on the filter housing, and a resonator tunnel provided in the filter housing and configured to apply cross-coupling at least two resonance blocks among the plurality of resonance blocks, thereby providing very simple design for implementing coupling for forming a notch.

High-order balanced bandpass filters that are continuously tunable in terms of frequency and bandwidth (BW) and can be intrinsically switched-off. The filters include multiple resonant sections cascaded between a differential RF input and a differential RF output. The resonant sections comprise at least one multi-resonant cell and at least one transmission pole cell. The multi-resonant cell includes four frequency tunable resonators, and is configured to create a frequency tunable pole at the center frequency of the filter, and two frequency tunable transmission zeroes at resonating frequencies of the resonators of the multi-resonant cell. The transmission pole cells each include two resistively-terminated frequency-tunable resonators configured to resonate at the center frequency of the filter.

Adaptive RF filters based on modulated resonators are provided. The filter architecture is based on time-interleaved commutation of passive RF resonators. The architecture can behave as a two-port filter network, with a fully tunable instantaneous filter bandwidth. The filters are applicable as miniaturized, environment-aware RF signal processing components and can be used in mobile communications.

Provided is a filter device that includes a post-wall waveguide and that has a variable passband. This filter device (1) includes: a post-wall waveguide (filter main body 1M) that functions as a plurality of resonators (10 to 50); cavities (cylinders 551 to 555) coupled to the respective resonators (10 to 50) via openings (AP1 to AP5) formed in a broad wall (conductor layer 2); rods (61 to 65) inserted into the cavities (cylinders 551 to 555); and a rod control mechanism (piezoelectric element 6P) that controls the positions of the rods (61 to 65).

The present disclosure relates to a cavity filter assembly and, particularly, comprises: a filter body having a cavity, which is a predetermined space therein; and at least one resonance bar having a front end surface that forms a stamped part, which is a protruding surface protruding from the bottom surface of the filter body toward the cavity so as to be parallel to the bottom surface of the filter body in the cavity, for frequency tuning in the cavity, and having a tuning correction hole that penetrates the stamped part, wherein the resonance bar allows frequency tuning to be performed in the cavity through stamping on the outer surface of the stamped part from the outside of the filter body, and the tuned frequency can be corrected through the tuning correction hole, and thus the advantages of reducing the total weight and component costs of an antenna device and improving product productivity are provided.

A band-stop filter comprises: a housing having a top wall, a bottom wall and at least one side wall, the housing defining an internal cavity; a signal input port and a signal output port that are respectively disposed on one of the at least one side wall; a resonating element that is disposed in the internal cavity and includes a top, a bottom, and a side; and a transmission line that is disposed in the internal cavity and coupled between the signal input port and the signal output port, the transmission line comprising a coupling section that is coupled to the resonating element, wherein the coupling section is configured to surround more than half of the side of the resonating element and not directly contact the housing and the resonating element.

The present disclosure provides a hybrid distinct wavelength resonant band-pass filter with capacitive coupling metal pattern, including a ceramic matrix. The ceramic matrix includes a first surface and a second surface opposite to the first surface. A first resonant cavity, a second resonant cavity, a third resonant cavity, a fourth resonant cavity, a fifth resonant cavity, a sixth resonant cavity, a seventh resonant cavity, an eighth resonant cavity, and a ninth resonant cavity, sequentially distributing along a length direction of the ceramic matrix, are formed between the first surface and the second surface. A metal pattern is disposed on the first surface, the metal pattern includes a first pattern region surrounding the third resonant cavity and a second pattern region surrounding the fourth resonant cavity.

A resonator includes: a shield housing; a first resonant element; and a second resonant element. The shield housing includes a first conductor portion located on a side of −Z direction and a second conductor portion located on a side of +Z direction, and has a cavity therein. The first resonant element has a columnar shape, lies within the cavity, and includes an end in the −Z direction joined to the first conductor portion and an end in the +Z direction spaced from the shield housing. The second resonant element in tubular dielectric form lies within the cavity, includes an end in the +Z direction joined to the second conductor portion and an end in the −Z direction spaced from the shield housing, and surrounds the first resonant element at a distance therefrom.

A single-layer cross-coupling filter includes a cavity in which a receiving space is formed; an integrally formed resonant structure installed in the receiving space; and at least one partition wall. The resonant structure includes at least two rows of resonant units distributed along a signal transmission path. The at least two rows of resonant units are located in a same plane of the receiving space, and each row of the resonant units includes a plurality of resonators. The resonators on a same row are coupled and connected to form signal transmission, and at least two adjacent resonators in different rows are coupled and connected to realize cross-coupling.

Disclosed are embodiments of ceramic radiofrequency filters advantageous as RF components. The ceramic filters can include a ceramic impedance resonator, wherein the inner diameter of the ceramic stepped impedance resonator can vary from one end to another end. The inner diameter can be designed to provide different impedances in the ceramic resonator.