A resonator assembly and method are disclosed. The resonator assembly comprises: a resonant chamber defined by a first wall, a second wall opposing the first wall and side walls extending between the first wall and the second wall; a first resonator comprising a first resonator element and a first resonator cap, the first resonator element having a first grounded end and an first open end, the first resonator element being grounded at the first grounded end on the first wall and extending into the resonant chamber, the first resonator cap having a first grounded portion and an first open portion, the first resonator cap being grounded at the first grounded portion on the second wall and extending into the resonant chamber to at least partially surround the first open end of the first resonator element with the first open portion for electrical field loading of the first resonator element by the first resonator cap; and a second resonator comprising a second resonator element and a second resonator cap located for electrical field loading of the second resonator element by the second resonator cap, the second resonator element being located for magnetic field coupling between the first resonator element and the second resonator element. In this way, a compact resonator assembly is provided having high operational performance. The provision of resonators having resonator elements and resonator caps helps to reduce the height of the resonator assembly to around one eighth of the operating wavelength. The provision of the resonator caps helps to contain the electrical field from the resonator elements, which enables adjacent resonator elements to be located closer together to provide for enhanced magnetic field coupling therebetween.

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 application is directed to a filter and methods of making the same. The filter includes a block of dielectric material with a top surface including a patterned region, a bottom surface, and side surfaces. The filter also includes a through-hole extending through the block from the top surface to the bottom surface. The through-hole is partially surrounded by the patterned region. The filter also includes a wall extending from the top surface, the wall having an inner surface, an outer surface, and a roof. The bottom surface, side surfaces, outer surface, and roof have a first coating including glass frit. The patterned region, through-hole and inner surface have a second coating including glass frit. The glass frit in the first coating is at least 0.5% greater than the glass frit in the second coating. The application is also directed to a system including a printed circuit board and a filter.

A cavity-type radio frequency filter is disclosed. the radio frequency filter having a cavity structure including an enclosure, a resonant element, a cover, a frequency tuning screw, and a resilient fixing member. The enclosure has a hollow inside and an open surface on one side to have a cavity. The resonant element is positioned in the hollow of the enclosure. The cover has a screw hole having a preset diameter at a position corresponding to the resonant element, and is configured to seal the open surface of the enclosure. The frequency tuning screw is configured to be screwed into the screw hole of the cover, and it has an upper end formed at least partially with a latching abutment that protrudes outwardly.

A band pass filter suitable for varying the center frequency of the passband and a method for controlling the band pass filter are provided. A band pass filter of the present invention includes: two TE01-mode dielectric resonators (10) and (20) disposed so as to oppose to each other; and a housing (30) made of metal enclosing the two dielectric resonators (10) and (20). An opposing interval between two dielectric resonators (10) and (20) is variable.

A tunable probe includes a first resonator, a second resonator spaced from the first resonator, and a cross-couple extending from the first resonator to the second resonator. The cross-couple includes a first substrate and a second substrate disposed between the first and second resonator to create a capacitance between the first and second resonators. The cross-couple further includes a wire connecting the first and second substrates and a dielectric surrounding the wire.

Methods, systems, and apparatuses, for a millimeter wave filter array are discussed. The filter array includes an array of unit cells formed using a dielectric layer of a dielectric material, the dielectric layer having a first surface and an opposing second surface. Each unit cell includes conductive sidewall layers extending at least partially between the first surface and the second surface of the dielectric layer and defining a resonant space within the dielectric layer. Each unit cell also includes a metallized layer formed on the first surface, covering at least a portion of the resonant space of the dielectric layer and electrically connected to the conductive sidewall layers. Each unit cell includes a radio-frequency input-output (RF I/O) contact formed on the first surface of the dielectric layer.

Methods, systems, and apparatuses, for a millimeter wave filter array are discussed. The filter array includes an array of unit cells formed using a dielectric layer of a dielectric material, the dielectric layer having a first surface and an opposing second surface. Each unit cell includes conductive sidewall layers extending at least partially between the first surface and the second surface of the dielectric layer and defining a resonant space within the dielectric layer. Each unit cell also includes a metallized layer formed on the first surface, covering at least a portion of the resonant space of the dielectric layer and electrically connected to the conductive sidewall layers. Each unit cell includes a radio-frequency input-output (RF I/O) contact formed on the first surface of the dielectric layer.

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.

Disclosed are embodiments of synthetic garnet materials for use in radiofrequency applications. In some embodiments, increased amounts of bismuth can be added into specific sites in the crystal structure of the synthetic garnet in order to boost certain properties, such as the dielectric constant and magnetization. Accordingly, embodiments of the disclosed materials can be used in high frequency applications, such as in base station antennas.