Abstract: A stripline filter with wide-band filter characteristics having an attenuation pole on a high frequency side of frequency characteristics. The stripline filter includes at least three resonant lines, and two of the resonant lines include parallel line parts and bent parts. The third resonant line has a U shape in which both ends thereof are open and interdigitally coupled to the two resonant lines located on both sides thereof. The parallel line parts extend from base ends connected to a ground electrode via side surface lines that are parallel to respective line parts of the third resonant line. The bent parts extend so as to be bent from ends of the parallel line parts, and face each other at an interval.

Abstract: A variable radio frequency band filter includes a housing with a plurality of cavities, a plurality of resonators, wherein one resonator is arranged in each cavity, and a tuning arrangement having a plurality of tuning structures. One of the tuning structures is arranged in each of the cavities. The tuning structures of multiple cavities are mechanically connected such that the tuning structures may be shifted simultaneously in order to simultaneously vary the resonance frequencies of the cavities. Each tuning structure includes at least one first metallic surface facing the resonator and at least one second metallic surface facing a wall of the cavity, the first and second metallic surfaces being conductively connected. The second metallic surface is arranged such that a small and essentially uniform gap is formed between the second metallic surface and the wall to achieve a virtual grounding of the metallic surfaces.

Abstract: A microstrip filter having a plurality of hairpin microstrip resonators each having two substantially rectangular legs connected at one end and generally configured in a “U” shape. The microstrip filter may comprise a first of the plural resonators operatively connected to a first feed point, a second of the plural resonators operatively connected to a second feed point, and a third of the plural resonators operatively connected between the first and second resonators where an end portion of one of the legs of one of the resonators is tapered so that a thickness of the one leg is greater at one end of the one leg than at another end of the one leg.

Abstract: An apparatus for coupling a combline resonator and a ceramic resonator, including one or more of the following: a housing; a combline resonator in the housing; a ceramic resonator in the housing, the ceramic resonator having a stem portion and a mushroom portion; a ridge extending between the combline resonator and the ceramic resonator, the ridge passing between the mushroom portion of the ceramic resonator and the housing, wherein a coupling is obtained between an electrical field of the combline resonator and an electrical field of the ceramic resonator.

Abstract: A filter filtering microwaves, the filter comprising a cavity and at least one metal comb-line resonator located within the cavity and at least one dielectric member surrounding the at least one metal comb-line resonator.

Abstract: A cavity filter includes an enclosure, resonators secured inside the enclosure, a lid, a slider, and a driving device. The enclosure includes a bottom portion, sidewalls extending from edges of the bottom portion to define a cavity. Each sidewall defines a positioning portion at a top surface thereof. The lid covers the enclosure. The slider includes tuning cells each partially coated with metal and positioned opposite to one of the resonators. The slider is movably disposed between the lid and the resonators and slides on the positioning portions. The driving device is located inside the enclosure and drives the slider to move along the positioning portions to adjust a resonating frequency of the cavity filter.

Abstract: A cavity filter defines a cavity with an opening on a top portion thereof and includes a lid to cover the opening of the cavity. A plurality of resonators are secured on a bottom portion opposite to the top portion of the cavity. The lid includes a plurality of bases extending from the lid toward the plurality of the resonators, respectively. A plurality of threaded holes penetrating the lid and one of the bases faces to the plurality of resonators, respectively. Each threaded hole includes a stopper portion extending from an inner surface of the threaded hole inward to form a step defining a hole in communication with the threaded hole. Each threaded hole corresponds to a tuning post to adjust a resonating frequency of the cavity filter.

Abstract: Various exemplary embodiments relate to a tuning element assembly and method for tuning an a radio frequency (RF) component, where the component has one or more walls defining a cavity, with at least one wall having at least one bore hole. A bushing is mounted in the bore hole in the wall, and a tuning element is slidably mounted and received in the bushing so that the tuning element projects inwardly through the bushing and into the cavity and is axially adjustable. A method of tuning an RF component also includes providing a bushing mounted in a bore in a wall of the RF component, sliding a tuning element that is slidably mounted and received in the bushing so that the tuning element projects inwardly through the bushing and into the cavity by a distance varying according to the sliding of the tuning element, monitoring a performance characteristic of the RF component, and releasing the tuning element so that a desired performance characteristic is achieved.

Abstract: Various exemplary embodiments include a technique for tuning a filter to have two stop bands. This technique may involve combination of signals from a plurality of high-band notch resonators and low-band notch resonators. Loop wires may couple both high-band and low-band notch resonators to a central conductor, thereby enabling the central conductor to transmit a signal having dual stop bands.

Abstract: Provided are a stacked resonator capable of achieving miniaturization and minimum loss, and a stacked resonator capable of suppressing any unnecessary resonance mode due to interdigital-coupling. The stacked resonator includes a first conductor group having a plurality of conductor lines in a stacking arrangement, and a second conductor group having a plurality of other conductor lines in a stacking arrangement so as to be alternately provided opposing to the conductor lines in the first conductor group, thereby establishing an interdigital-coupling together with the first conductor group.

Abstract: An antenna feed coupling structure of a duplexer is disclosed to include a base defining a detoured resonance cavity and a T-shaped feed-in cavity perpendicularly intersecting the resonance cavity and a signal input port in connection with the head of the feed-in cavity, a cover closing the base, and adjustment rods mounted in the base and suspending in the resonance cavity and the feed-in cavity. The adjustment rods include two feed-in adjustment rods and two coupling structure adjustment rods suspending in the intersected area between the resonance cavity and the feed-in cavity and respectively kept in horizontal and in vertical relative to the resonance cavity and rotatable inwards and outwards to adjust the feed-in amount and coupling structure amount of the antenna feed coupling structure respectively.

Abstract: A frequency-tunable filter using a sliding system is disclosed. The frequency-tunable filter includes: a housing, in which a multiple number of cavities are defined by partitions; a sub-cover, which is coupled to an upper portion of the housing and in which a guide groove is formed; at least one sliding member installed in the guide groove; a main cover coupled to an upper portion of the sub-cover; a resonator held in the cavity; and at least one tuning element coupled to a lower portion of the sliding member to be inserted inside the housing, where tuning is achieved by a sliding movement of the sliding member, and at least one first guide member is coupled to at least one side surface of the sliding member such that the first guide member guides a sliding movement by way of contact with the side surface of the guide groove.

Abstract: An inline microwave bandpass filter where cross coupling between non-adjacent resonators is realized by changing the orientation of selected resonators. The microwave bandpass filter includes a cavity and three or more resonators arranged in a row (or inline) in the cavity. At least one resonator has a different spatial orientation from at least one other resonator. For example, one or more of the resonators may be rotated 90 or 180 degrees with respect to one of the other resonators. This arrangement of resonators facilitates sequential coupling between pairs of adjacent resonators and cross coupling between at least one pair of non-adjacent resonators without the use of additional cross coupling structures such as dedicated coupling probes or extra cavities. One or more plates may be introduced between adjacent resonators to independently control the sequential and cross coupling.

Abstract: A waveguide switch is shown. The waveguide switch includes a frequency selective surface and a biasing diode configured to selectively provide a short between an outer metal loop and an inner metal loop to place the frequency selective surface into either a non-reflective state or a reflective state.

Abstract: An apparatus 100 comprising a radiofrequency filter body housing 102. The radiofrequency filter body housing includes a polymeric composition 110 that includes at least one polymer foam 115 and filler material 120. The filler material is uniformly distributed and randomly oriented throughout the polymeric composition. The radiofrequency filter body housing also includes an electrically conductive material 125 coating the polymeric composition.

Abstract: The invention refers to a system and method to tune a multicavity filter of microwave signals, said filter comprising a filter body (CF), a removable lid (CO), n resonant cavities dug out in said filter body (CF) and n tuners (TU) susceptible of displacement under the action of movement means. Typically a sub-system to absorb the oscillations and vibrations generated in such displacements is associated to each tuner.

Abstract: Various exemplary embodiments include a cavity having a tuning assembly with tunable capacitive coupling. The tuning assembly may have a recess having a specified depth, designed for a default magnitude of coupling into the cavity. A sleeve may be fully inserted within the recess to have the structure operate at that default coupling magnitude. If a different amount of coupling is desired, the sleeve may be inserted to a particular depth that only includes part of the recess, enabling repeatable tuning of a plurality of cavities.

Abstract: A variable radio frequency band filter capable of varying the resonance frequency band comprises a housing having a support; a number of resonator rods arranged along the longitudinal direction of the housing; at least one tuning rod positioned on top of the resonator rods; a tuning support extending through the respective tuning rods along the longitudinal direction of the housing and adapted to slide on top of the respective resonator rods to vary the position of the tuning rods; and a frequency variation unit positioned on a lateral surface of the housing. The frequency variation unit being coupled to an end of the tuning support and adapted to vary the position of the tuning rods, as the tuning support is slid, according to the frequency band.

Abstract: A fixation arrangement for a resonator of a cavity body includes a cavity body including a base, a resonator defining a cavity and comprising a bottom, a screw including sharply arc-shaped head and securing the resonator on the base of the cavity body, and a sticky element located between the screw head of the screw and the bottom of the resonator.

Abstract: Provided is a resonator filter using conductive plates having a curved surface to connect an input/output coaxial connector to a resonator. The resonator filter includes: a plurality of resonators for resonating; an input/output coaxial connector; an input/output supporting unit formed between the input coaxial connector and one of the resonators and/or between an output supporting unit formed between the output coaxial connector and other resonator for electrically and mechanically supporting the input/output coupling; and a connecting unit for connecting the input/output supporting unit and the input/output coaxial connector, wherein the input/output supporting unit is a conductive plate with a curved surface having a center axis similar to the resonators.

Abstract: A radio filter has a band pass filter for passing a desired band of signal frequencies and a band stop filter for reducing the passing of a band of undesired signal frequencies. The filter comprises an input terminal, an output terminal, and a filter having a multiple of transmission lines arranged between said input and output terminal which filters input signals through said input terminal to pass signals of a given frequency band. A ground is connected to said transmission lines at first ends of said multiple of transmission lines and acoustic impedance elements are connected between said ground layer and second ends of said multiple transmission lines for providing a stop band filter function of the input signals, and whereby the input signal after band pass filtering and stop band filtering is provided at said output terminal.

Abstract: A filter for processing an RF signal includes an input port and an output port and a plurality of resonators. The resonators are arranged in a sequentially-coupled arrangement between the input and output ports to affect an RF signal therebetween. Each resonator includes a cavity and resonant element. The resonant elements of at least two resonators are made of two different types of materials to effect higher and lower Q factors for the resonators. The resonators are arranged to provide at least one resonator having a lower Q factor proximate one of the input and output ports while the higher Q factor resonator is provided proximate the inside of the sequentially-coupled arrangement.

Abstract: An improved high frequency filter displays the following features: the high frequency filter displays transmission behavior with a coupling impedance resonance having at least one blocking point at a frequency, the blocking point at the frequency being adjustable by presetting and/or preselecting a defined capacitive and inductive coupling between two coaxial resonators, one immediately following the other on a signal path.

Abstract: Various exemplary embodiments include a technique for tuning a filter to have two stop bands. This technique may involve combination of signals from a plurality of high-band notch resonators and low-band notch resonators. Loop wires may couple both high-band and low-band notch resonators to a central conductor, thereby enabling the central conductor to transmit a signal having dual stop bands.

Abstract: A coupled line filter includes: a first line resonator connected input port and a second line resonator connected with output port each having an electrical length of 270° at a predetermined center frequency, the first and second line resonators being disposed parallel to each other; and a third line resonator including one or more line resonators disposed between the first line resonator and the second line resonator, each line resonator having an electrical length of 90° at the center frequency and a first side aligned with first sides of the first line resonator and the second line resonator, wherein an order of the coupled line filter is determined by summing the number of the line resonators included in the third line resonator and the first and second line resonators.

Abstract: A ball grid array ceramic filter including a substrate having a ground layer of conductive material disposed over one of the surfaces thereof and a plurality of strips of conductive material on the other of the substrate surfaces defining resonators adapted to receive and pass RF signals. A plurality of vias extend through the substrate and define opposed ends terminating in the respective substrate surfaces. In one embodiment, a plurality of conductive spheres defining respective ground and RF signal input/output pads are disposed on the substrate surface with the ground layer thereon. Certain of the vias couple the resonators to the ground layer while others of the vias couple the resonators to respective spheres adapted for coupling to the respective RF signal input/output contacts on the top surface of a printed circuit board to which the filter is adapted to be direct surface mounted.

Abstract: An apparatus for coupling a combline resonator and a ceramic resonator, including one or more of the following: a housing; a combline resonator in the housing; a ceramic resonator in the housing, the ceramic resonator having a stem portion and a mushroom portion; a ridge extending between the combline resonator and the ceramic resonator, the ridge passing between the mushroom portion of the ceramic resonator and the housing, wherein a coupling is obtained between an electrical field of the combline resonator and an electrical field of the ceramic resonator.

Abstract: A microstrip filter having a plurality of hairpin microstrip resonators each having two substantially rectangular legs connected at one end and generally configured in a “U” shape. The microstrip filter may comprise a first of the plural resonators operatively connected to a first feed point, a second of the plural resonators operatively connected to a second feed point, and a third of the plural resonators operatively connected between the first and second resonators where an end portion of one of the legs of one of the resonators is tapered so that a thickness of the one leg is greater at one end of the one leg than at another end of the one leg.

Abstract: In a multilayer bandpass filter, capacitances are produced between a ground electrode provided in a ground electrode formation layer and capacitor electrodes provided in a capacitor electrode formation layer. A plurality of inductor electrodes are defined by via-electrodes and line electrodes such that loop planes of inductor electrodes at least partially overlap each other when seen in a direction in which the inductor electrodes are arranged. The direction of the loop of the inductor electrode of the LC parallel resonator located (at a first stage) at an input end is set to be opposite to the direction of the loop of the inductor electrodes of the LC parallel resonator (at a second stage) adjacent to the inductor electrode of the LC parallel resonator located at the input end.

Abstract: A method for forming flanged end of an inner conductor of a coaxial resonator at one end of the conductive body. The flange is formed integral to the conductive body by flaring the end of the conductive body. The size and shape of the flange are selected to achieve a desired capacitance surface area for use in a resonator. A combination of expanding tool and calibration tool are used to control the size and shape of the flange that will be formed on the end of the conductive body.

Abstract: An apparatus 100 comprising a radiofrequency filter body housing 102. The radiofrequency filter body housing includes a polymeric composition 110 that includes at least one polymer foam 115 and filler material 120. The filler material is uniformly distributed and randomly oriented throughout the polymeric composition. The radiofrequency filter body housing also includes an electrically conductive material 125 coating the polymeric composition.

Abstract: A filter element includes a flat dielectric substrate, a ground electrode on a back main surface of the dielectric substrate, resonant lines each having a shorting end in the vicinity of a border between a side of the dielectric substrate and the ground electrode and extending from the side to a front main surface of the dielectric substrate. The resonant lines and the ground electrode constitute strip-line resonators. In any of the strip-line resonators, the line width of the resonant-line side portion is different from the line width of the resonant-line main-surface portion.

Abstract: A microstripline filter capable of strengthening capacitive coupling between resonators and suppressing fineness of electrodes is provided. The microstripline filter includes principal-surface lines, a ground electrode, and input/output electrodes. A first principal-surface line is capacitively coupled to a second principal-surface line. The second principal-surface line is inductively coupled to a third principal-surface line. The third principal-surface line is capacitively coupled to a fourth principal-surface line. The first through fourth principal-surface lines include open-end-side electrodes, short-circuit-end-side electrodes, and end-opened electrodes. A first pair of the end-opened electrodes are adjacent to each other, whereas a first pair of the short-circuit-end-side electrodes are separate from each other. A second pair of end-opened electrodes are adjacent to each other, whereas a second pair of short-circuit-end-side electrodes are separate from each other.

Abstract: A combline filter has a ceramic resonator disposed inside at least one cavity wall. Because the resonator is implemented as a hollow rod, a tuning element may be inserted into an opening on the top of the rod to tune its frequency. A mounting element, inserted into an opening on the bottom of the rod secures its position inside a cavity resonator. Instead of soldering the resonator to the filter's walls, the resonator is supported above a bottom or side wall of the cavity resonator.

Abstract: An antenna feed coupling structure of a duplexer is disclosed to include a base defining a detoured resonance cavity and a T-shaped feed-in cavity perpendicularly intersecting the resonance cavity and a signal input port in connection with the head of the feed-in cavity, a cover closing the base, and adjustment rods mounted in the base and suspending in the resonance cavity and the feed-in cavity. The adjustment rods include two feed-in adjustment rods and two coupling structure adjustment rods suspending in the intersected area between the resonance cavity and the feed-in cavity and respectively kept in horizontal and in vertical relative to the resonance cavity and rotatable inwards and outwards to adjust the feed-in amount and coupling structure amount of the antenna feed coupling structure respectively.

Abstract: The present invention is provided with a high frequency module comprising a multilayered substrate, a power amplifier IC mounted on the upper surface of the multilayered substrate, first and second filters disposed substantially directly below the power amplifier IC in an inner layer of the multilayered substrate, and coupling-reducing ground vias disposed between the first filter and the second filter. At least the first filter is disposed substantially directly below the power amplifier IC. The coupling-reducing ground vias double as thermal vias for dissipating heat generated by the power amplifier IC.

Abstract: A dual channel band-pass filter (10) includes an input portion (100), a first resonator (140), a second resonator (160), and an output portion (120). The input portion is used for inputting electromagnetic signals. The first resonator is electronically connected to the input portion, and includes a first groove (146) in the vicinity of a center thereof. The second resonator is disposed parallel to the first resonator, and includes a second groove (166) in the vicinity of a center thereof. The output portion is disposed parallel to the input portion, and is electronically connected to the second resonator for outputting electromagnetic signals.

Abstract: A variable radio frequency band filter capable of varying the resonance frequency band comprises a housing having a support; a number of resonator rods arranged along the longitudinal direction of the housing; at least one tuning rod positioned on top of the resonator rods; a tuning support extending through the respective tuning rods along the longitudinal direction of the housing and adapted to slide on top of the respective resonator rods to vary the position of the tuning rods; and a frequency variation unit positioned on a lateral surface of the housing. The frequency variation unit being coupled to an end of the tuning support and adapted to vary the position of the tuning rods, as the tuning support is slid, according to the frequency band.

Abstract: In a dielectric filter (1) for base station communication equipment, a rectangular solid dielectric block (2) is provided with a plurality of 1/4 wavelength resonators (3A1-3A4;3B1-3B4), which are arranged along side planes (2c,2d) of the dielectric block and extend in parallel to each other and to the side planes (2c,2d). The dielectric block (2) is composed of dielectric ceramics having a relative dielectric constant of 5-20, and a size (H) in a direction orthogonally intersecting with the side planes (2c,2d) of the dielectric block (2) is 10-30 mm.

Abstract: A dual-band filter (10) is provided. The dual-band filter includes an input line (100), a first transmission line (140), a second transmission line (160), a third transmission line (180), and an output line (120). The input line is used for inputting electromagnetic signals. The first transmission line is electronically connected to the input line. The second transmission line is arranged parallel to the first transmission line. The third transmission line is arranged between, and parallel to, the first transmission line and the second transmission line. The output line for outputting electromagnetic signals, is arranged parallel to the input line, and is electronically connected to the second transmission line.

Abstract: The invention relates to a high frequency filter of coaxial construction, comprising an outer conductor housing with a housing base and a housing wall, whereby several resonators are embodied in the outer conductor housing, each comprising an inner conductor tube, electrically-coupled to the housing base. At least one part of adjacent resonators are electrically-coupled to each other by means of at least one coupling opening in the outer conductor housing. Said filter is characterized in that one or more recesses are embodied in the housing base, between at least one part of the inner conductor tube of adjacent resonators.

Abstract: A reverse-phase cross coupling structure includes a base, which has a resonance chamber, resonators vertically arranged in parallel in the resonance chamber, and coupling portions respectively coupled between each two adjacent resonators, each coupling portion having a top recess and a coupling hole in the top recess, and an adjustment device, which comprises a cover plate fixedly covered on the base and has through holes corresponding to the coupling holes of the coupling portions and a plurality of adjustment screws respectively inserted through the through holes of the cover plate and threaded into the coupling holes of the coupling portions to the desired elevation to regulate the amount of the reverse-phase cross coupling of the resonators. This novel reverse-phase cross coupling structure is achieved only by base and adjustment device, it is not necessary to employ extra parts as in the prior designs.

Abstract: The invention refers to a system and method to tune a multicavity filter of microwave signals, said filter comprising a filter body (CF), a removable lid (CO), n resonant cavities dug out in said filter body (CF) and n tuners (TU) susceptible of displacement under the action of movement means. Typically a sub-system to absorb the oscillations and vibrations generated in such displacements is associated to each tuner.

Abstract: A ceramic monoblock filter incorporating a top face input/output port metallization pattern defining an input/output transmission line, a power load distribution bar, and a ground plate. The transmission line, power load distribution bar, and ground plate are all positioned and oriented relative to each other and two of the resonators defining the filter to define load splitting capacitors providing increased power load handling characteristics.

Abstract: A variable radio frequency band filter capable of varying the resonance frequency band comprises a housing having a support; a number of resonator rods arranged along the longitudinal direction of the housing; at least one tuning rod positioned on top of the resonator rods; a tuning support extending through the respective tuning rods along the longitudinal direction of the housing and adapted to slide on top of the respective resonator rods to vary the position of the tuning rods; and a frequency variation unit positioned on a lateral surface of the housing. The frequency variation unit being coupled to an end of the tuning support and adapted to vary the position of the tuning rods, as the tuning support is slid, according to the frequency band.

Abstract: A comb-line wireless filter (5) includes an input end (505a), an output end (505b), a first transmission line (501b), a second and third transmission line (501a, 501c) each having a curved shape, and a first, second, and third capacitor (503b, 503a, 503c). The first transmission line has a first transmission line part and a second transmission line part. The second transmission line and the third transmission line are separately on the two sides of the first transmission line part of the first transmission line. The input end and the output end are separately connected to first ends of the second transmission line and the third transmission line. The capacitors are separately connected to first ends of the transmission lines. According to the curved shape of the second transmission line and the third transmission line, the size of the comb-line wireless filter is significantly reduced.

Abstract: Provided is a resonator filter using conductive plates having a curved surface to connect an input/output coaxial connector to a resonator. The resonator filter includes: a plurality of resonators for resonating; an input/output coaxial connector; an input/output supporting unit formed between the input coaxial connector and one of the resonators and/or between an output supporting unit formed between the output coaxial connector and other resonator for electrically and mechanically supporting the input/output coupling; and a connecting unit for connecting the input/output supporting unit and the input/output coaxial connector, wherein the input/output supporting unit is a conductive plate with a curved surface having a center axis similar to the resonators.

Abstract: An improved high frequency filter displays the following features: the high frequency filter displays transmission behavior with a coupling impedance resonance having at least one blocking point at a frequency, the blocking point at the frequency being adjustable by presetting and/or preselecting a defined capacitive and inductive coupling between two coaxial resonators, one immediately following the other on a signal path.

Abstract: A stacked filter includes an array of resonant sections, the resonant sections adjacent each other being electromagnetically coupled, a first resonator electromagnetically coupled to the resonant section on one end of the array of the resonant sections, and a second resonator electromagnetically coupled to the resonant section on the other end thereof. Each of the resonant sections has a pair of interdigital coupled quarter-wave resonators, and a passing frequency as a filter is set to a value f2 lower than a frequency f0 determined by a physical length ?0/4 of the quarter-wave resonator. The first and second resonators have a physical length of ?2/4, where ?2 is a wavelength corresponding to the passing frequency f2. The stacked filter enables miniaturization and sufficient impedance matching with external circuits in a broad band, resulting in excellent filter characteristics in the broad band.

Abstract: In order to permit electronic tuning of the frequency of a circuit including dielectric resonators, such as a dielectric resonator filter, tuning plates are employed adjacent the individual dielectric resonators. The tuning plates comprises two separate conductive portions and an electronically tunable element electrically coupled therebetween. The electronically tunable element can be any electronic component that will permit changing the capacitance between the two separate conductive portions of the tuning plates by altering the current or voltage supplied to the electronically tunable element. Such components include virtually any two or three terminal semiconductor device. However, preferable devices include varactor diodes and PIN diodes.