Abstract: 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.

Abstract: 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.

Abstract: An in-line resonator filter has a linear array of three or more conductors. A first pair of adjacent conductors has inductive main coupling and oppositely signed capacitive main coupling, while a second pair of non-adjacent conductors has inductive cross-coupling. The first and second pairs have one conductor in common. Between the second pair of non-adjacent conductors, there is no direct ohmic connection that provides the corresponding inductive cross-coupling. The oppositely signed capacitive main coupling compensates for at least a portion of the inductive main coupling between the first pair of adjacent conductors. The in-line resonator filter is able to provide one or more transmission zeros without requiring any discrete bypass connectors that provide direct ohmic connection between pairs of non-adjacent conductors. As such, the in-line resonator filters can be smaller, less complex, and less susceptible to damage.

Abstract: 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.

Abstract: This application provides an example dielectric filter and an example communications device. The dielectric filter includes a dielectric block. At least two resonant through holes that are parallel to each other are provided in the dielectric block. The resonant through hole is a stepped hole. The stepped hole includes a large stepped hole and a small stepped hole that are arranged coaxially and that are in communication. The small stepped hole passes through a first surface of the dielectric block. The large stepped hole passes through a second surface of the dielectric block. A stepped surface is formed between the large stepped hole and the small stepped hole. The surfaces of the dielectric block are covered with conductor layers. The conductor layers cover the surfaces of the dielectric block and inner walls of the large stepped hole and the small stepped hole. A conductor layer of the inner wall of the large stepped hole is short-circuited with a conductor layer of the second surface.

Abstract: A current filter externally coupled to a cable includes a coupling portion coupled to a cable portion to surround the cable portion including at least one cable, the coupling portion including a flexible metal, and a ground portion detachably attached to the coupling portion and transmitting a current flowing through the coupling portion to a ground plane.

Abstract: A multi-band RF monoblock filter including at least three RF signal filters defined in the monoblock of dielectric material by resonators defined in part by through-holes extending through the block. In one embodiment, two of the RF signal filters are in a co-linear and side-by-side relationship and the third filter is in a parallel and side-by side relationship with one of the two other RF signal filters. A pattern of conductive material defines two end and one interior RF signal input/output on the block top surface. The end RF signal input/outputs are located at opposite ends of the block and the central RF signal input/output is located between the two co-linear and side-by-side RF filters. An RF signal is transmitted through the one end RF signal input/output, the two parallel and side-by-side RF signal filters, and the central RF signal input/output and also through the other end RF signal input/output, one of the co-linear and side-by-side RF filters, and the central RF signal input/output.

Abstract: Disclosed are embodiments of ceramic radiofrequency filters advantageous as RF components. The ceramic filters can include a ceramic stepped 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, for example, tapered, sectioned, or stair-stepped in order to provide different impedances in the ceramic resonator.

Abstract: A fabrication system is operable to form a structure (such as on a substrate) using a combination of a first (electrically) non-conductive material and a second (electrically) non-conductive. In one embodiment, the structure defined by the first material and the second material defines a void (passageway) in the structure. In one embodiment, exposed surfaces of the first non-conductive material and the second non-conductive material define the void in the structure. Subsequent to creating the structure including the void, the fabrication system fills the void (such as via injection) with an electrically conductive material. After the injected electrically conductive material (such as metal epoxy or other suitable material) solidifies, the fabrication system removes the first non-conductive material (sacrificial material) from the structure. The remaining second material provides structural support for the electrically conductive material.

Abstract: The present disclosure presents a dual-channel filter based on a dielectric resonator, which includes a metal cavity, a dielectric resonator, two tuning metal probes, and four feeding metal probes. The dielectric resonator is disposed at the center of the metal cavity. The four feeding metal probes are disposed around the metal cavity, and coupled to the dielectric resonator. The two tuning metal probes are connected to the metal cavity, and respectively located at a central position directly above and below the dielectric resonator. The dual-channel filter integrates two channel filters with good isolation between them, and has two input ports and two output ports.

Abstract: Disclosed is a structured hybrid different-wavelength resonant ceramic filter, comprising a ceramic substrate and an input/output electrode, wherein the ceramic substrate comprises a first surface and a second surface opposite to the first surface, five first resonant cavities, two second resonant cavities and two third resonant cavities are formed between the first surface and the second surface in a horizontal direction; the five first resonant cavities are located in the middle of the first surface of the ceramic substrate, the two second resonant cavities are respectively located at both sides of the five first resonant cavities, and the two third resonant cavities are respectively located lateral relative to the two second resonant cavities. With the present disclosure, filters with various forms and functions are integrated into a multi-cavities filter, and it is simple in structure.

Abstract: A power divider/combiner includes a main conductor defining an axis and having an outer surface; an input connector, at a front end, having a center conductor, electrically coupled to the main conductor and having an axis aligned with the main conductor axis; a first hollow cylindrical conductor having an open end facing rearwardly, having an inner cylindrical surface, the main conductor being received in and spaced apart from the inner cylindrical surface, the first hollow cylindrical conductor being electrically coupled to the second conductor of the input connector; a second hollow cylindrical conductor having an open end facing forwardly, the first cylindrical conductor being received in and spaced apart from the inner cylindrical surface of the second cylindrical conductor; a third hollow cylindrical conductor having an open back end facing rearwardly, the second cylindrical conductor being received in and spaced apart from the inner cylindrical surface of the third cylindrical conductor; and a plurality

Abstract: Impedance tuners used in high power measurements suffer fast heating and consequently mostly linear thermal expansion of the central conductor, which has a very small mass and is thermally isolated from the slabline walls and the tuner housing. This leads to false measurements or catastrophic tuner failure (short) of either the DUT or the tuner. Gold plated INVAR and SUPER-INVAR center conductor material is preferred to traditional stainless-steel rod. The body of the airline is made of high conductivity low cost Aluminum. INVAR type alloys quasi eliminate the thermal expansion, reducing it by a factor between 10 and 40 compared to Steel. Practical tests have shown significant improvement in thermal behavior.

Abstract: The present invention is a high Q tunable co-axial filter, which maintains a constant absolute bandwidth and a constant Q over the tuning range. The present filter can be tuned by a single rotational mechanism irrespective of the filter order. A plurality of tunable resonators is aligned on a common filter axis. Each resonator has a casing having an inner wall and a cavity. The resonators are coupled by an iris opening. A pair of end plates completes the filter casing. A rotating rod placed on the common axis of the resonated, that has a tuning post attached to it, and each post located in each resonator, is used to tune the filter.

Abstract: The invention relates to a cavity resonator device (1000) comprising at least two adjacent cavity resonators (1010, 1020) for radio frequency, RF, signals, separated by a common side wall (1030) having an opening (1032) wherein said cavity resonator device (1000) comprises at least one coupling element (100) for coupling two adjacent cavity resonators (1010, 1020) of said cavity resonator device (1000) wherein said at least one coupling element (100) comprises a base section (110) and a top section (120), wherein said top section (120) is displaced vertically from said base section (110) by a first distance (d1) along a longitudinal axis (a1) of said coupling element (100), and wherein said coupling element (100) comprises at least a first coupling arm (130) and a second coupling arm (140), each of said coupling arms (130, 140) connecting said base section (110) with said top section (120), wherein said at least one coupling element (100) is arranged rotably around an axis of rotation with respect to said wal

Abstract: An electronic device may include a housing, a first printed circuit board (PCB) carried by the housing and radio frequency (RF) circuitry on the PCB, and an RF filter module carried by the PCB. The RF filter module may include a second PCB carried by the first PCB, a plurality of first coaxial resonators arranged in side-by-side relation on the second PCB, and at least one second coaxial resonator stacked on the plurality of first coaxial resonators, and interconnect circuitry coupling the plurality of first coaxial resonators and the at least one second coaxial resonator to the second PCB.

Abstract: Doherty power amplifier having high supply voltage. In some embodiments, a power amplification system can include a supply system configured to provide a high-voltage supply signal, and a Doherty power amplifier having an input splitter configured to receive and split a signal into a carrier amplifier and a peaking amplifier. The Doherty power amplifier can further include a combiner configured to combine amplified signals from the carrier and peaking amplifiers to provide an output signal. The Doherty power amplifier can be configured to receive the high-voltage supply signal for operation of the carrier and peaking amplifiers. The power amplification system can further include an output path configured to couple the combiner to a filter. The Doherty power amplifier can have an impedance substantially the same as an impedance of the filter when operated with the high-voltage supply signal.

Abstract: A filter apparatus includes a filter body including one or more resonator cavities, a casing, wherein the filter body is arranged inside the casing, and at least one flexible fixing member. A first connection area of the at least one flexible fixing member is fixed to the casing and a second connection area of the at least one flexible fixing member is fixed to the filter body. The at least one flexible fixing member is made of material including at least one of metal, polymer, rubber.

Abstract: A dielectric filter unit includes three or more dielectric blocks including a first dielectric block and a second dielectric block and arranged in a predetermined direction, and a transmission line. The three or more dielectric blocks include at least one dielectric block between the first dielectric block and the second dielectric block. Each of the three or more dielectric blocks is electromagnetically coupled to one or two adjacent dielectric blocks included in the three or more dielectric blocks. The transmission line is electromagnetically coupled to the first dielectric block and the second dielectric block.

Abstract: A multi-band RF monoblock filter including at least three RF signal filters defined in the monoblock of dielectric material by resonators defined in part by through-holes extending through the block. In one embodiment, two of the RF signal filters are in a co-linear and side-by-side relationship and the third filter is in a parallel and side-by side relationship with one of the two other RF signal filters. A pattern of conductive material defines two end and one interior RF signal input/output on the block top surface. The end RF signal input/outputs are located at opposite ends of the block and the central RF signal input/output is located between the two co-linear and side-by-side RF filters. An RF signal is transmitted through the one end RF signal input/output, the two parallel and side-by-side RF signal filters, and the central RF signal input/output and also through the other end RF signal input/output, one of the co-linear and side-by-side RF filters, and the central RF signal input/output.

Abstract: Disclosed are embodiments of ceramic radiofrequency filters advantageous as RF components. The ceramic filters can include a ceramic stepped 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, for example, tapered, sectioned, or stair-stepped in order to provide different impedances in the ceramic resonator.

Abstract: The present application is directed to a filter and methods of transmitting a signal through the filter. The filter includes a pair of adjoined blocks of dielectric material. A top surface of each block has a conductive patterned region. The filter also includes plural spaced apart through-holes extending through each block from the top surface to a bottom surface. The through-holes are partially surrounded by the patterned region. The filter also includes a peripheral window disposed between the adjoined blocks to permit a coupling between adjacent through-holes of the adjoined blocks. The filter also includes an in-line window and/or a crenellation located within a block of the pair of blocks and disposed between adjacent through-holes of the block to limit or tune coupling between the adjacent through-holes. The application is also directed to a system including a printed circuit board and a filter.

Abstract: Provided is a multi-resonator bandpass filter, which comprises a block, an input electrode, and an output electrode. The block comprises an open surface, a short-circuited surface, and a top surface. Multiple of resonant holes are penetrated through the block. The open surface is provided with a first hollowed-out region; the top surface is provided with two second hollowed-out region; the input electrode and the output electrode are disposed on the two second hollowed-out region, respectively. The block further comprises a ground metal layer and a resonant coating layer. Each of the resonant holes is coaxially provided with a first groove and a second groove in the direction from the open surface to the short-circuited surface. The first groove is a rectangular shape in the cross-section parallel to the open surface, and the second groove is substantially a round shape in the cross-section parallel to the open surface.

Abstract: A high-frequency conductor system has a high-frequency housing which comprises a housing base, a housing cover which is at a distance from the housing base, and a housing wall which runs circumferentially between the housing base and the housing cover, as a result of which an accommodation space is formed. At least one cable-bound RF bushing is arranged within the accommodation space. The cable-bound RF bushing is electrically isolated from the high-frequency housing. A capacitive coupling element is arranged on at least one part of the circumference of the cable-bound RF bushing and is electrically connected to said cable-bound RF bushing. The capacitive coupling element has two end sides which are oriented transverse or perpendicular to the propagation direction of the cable-bound RF bushing. A first coupling web is electrically connected to the high-frequency housing and is arranged at a distance from the end side in order to generate a capacitive coupling.

Abstract: A PIM test bench including a first duplexer, having a first port connected via a first filter to a third port and a second port connected via a second filter to the third port. The first port is fed by signal sources providing RF signals at first and second frequencies. A spectrum analyzer is connected to the second port. A device under test is connected between said third port and a third port of a second duplexer. Each of the first and second ports of the second duplexer is connected to a PIM optimized load and/or a standard load. The second duplexer is preferably identical to the first duplexer. For minimizing self-intermodulation, at least the first duplexer comprises at least one filter component and a metal housing. The housing further includes a monolithic metal body and a metal cover capacitively coupled to the body without any galvanic contact.

Abstract: A method for compensating a temperature drift of a microwave filter comprises: measuring a first frequency response of a microwave filter at a first temperature; determining values of elements of an equivalent circuit corresponding to the microwave filter such that a first modelled frequency response computed using the equivalent circuit matches the first measured frequency response to obtain a first model modelling the microwave filter at the first temperature: measuring a second frequency response of the microwave filter at a second temperature; determining values of elements of the equivalent circuit corresponding to the microwave filter anew such that a second modelled frequency response computed using the equivalent circuit matches the second measured frequency response to obtain a second model modelling the microwave filter at the second temperature; and adjusting an overall temperature drift of the microwave filter to adjust the temperature drifts of the resonant filter elements.

Abstract: A resonant trap includes a hollow cylindrical body its interior forming an axial channel. An inner conductor is provided on the hollow cylindrical body's inner wall and an outer conductor is provided on the hollow cylindrical body's outer wall. A carrier in the form of a resilient ring or an axial plate is attached to the inner wall of the axial channel and a tuning capacitor mounted to the carrier.

Abstract: Systems and devices for providing differential input/output communication with a superconducting device are described. Each differential I/O communication is electrically filtered using a respective tubular filter structure incorporating superconducting lumped element devices and high frequency dissipation by metal powder epoxy. A plurality of such tubular filter structures is arranged in a cryogenic, multi-tiered assembly further including structural/thermalization supports and a device sample holder assembly for securing a device sample, for example a superconducting quantum processor. The interface between the cryogenic tubular filter assembly and room temperature electronics is achieved using hermetically sealed vacuum feed-through structures designed to receive flexible printed circuit board cable.

Abstract: A TEM-line network architecture for RF components used in antenna system, includes an electrically conductive main body forming an outer conductor defining a signal channel, and an electrically conductive center conductor electrically grounded to the main body at predetermined locations. The center conductor is electromagnetically isolated from the outer conductor at RF frequencies while being connected and supported within the signal channel only at at least one of the predetermined locations. The outer conductor is preferably formed of three layers with the center conductor being integral with one of the layers.

Abstract: A coaxial filter is provided. The coaxial filter comprises a first port, a second port, at least two capacitor segments each having two metal layers and a dielectric layer between them, and at least one grounded inductor stub connected to a metal layer of the at least two capacitor segments. The at least two capacitor segments are coaxially connected in series between the first port and the second port. An axis of the at least one grounded inductor stub is vertical to an axis of the at least two capacitor segments.

Abstract: A multi-band RF monoblock filter including at least three RF signal filters defined in the monoblock of dielectric material by resonators defined in part by through-holes extending through the block. In one embodiment, two of the RF signal filters are in a co-linear and side-by-side relationship and the third filter is in a parallel and side-by side relationship with one of the two other RF signal filters. A pattern of conductive material defines two end and one interior RF signal input/output on the block top surface. The end RF signal input/outputs are located at opposite ends of the block and the central RF signal input/output is located between the two co-linear and side-by-side RF filters. An RF signal is transmitted through the one end RF signal input/output, the two parallel and side-by-side RF signal filters, and the central RF signal input/output and also through the other end RF signal input/output, one of the co-linear and side-by-side RF filters, and the central RF signal input/output.

Abstract: A high-frequency front end circuit includes a duplexer, a phase adjustment circuit, and a power amplifier. The phase adjustment circuit is connected between the power amplifier and a transmission filter of the duplexer. The phase adjustment circuit carries out phase adjustment so that a quadrant in which an impedance ZRX (fr0) seen from the transmission filter toward the power amplifier at the fundamental frequency of a reception signal is present and a quadrant in which an impedance ZTX (fr0) seen from the power amplifier toward the transmission filter at the fundamental frequency of the reception signal is present are not in a conjugate relationship with respect to the phase.

Abstract: A dielectric contactless transmission device provided with a pair of ¼ wavelength dielectric resonance components (2, 3) having: dielectric blocks (20, 30) that have a first surface (20a), a second surface (20b), third to sixth surfaces (20c-20f) connecting the first surface (20a) and the second surface (20b), and a resonance hole (20g) for making the first surface (20a) and the second surface (20b) communicate; intra-resonance hole conductors (21, 31) covering the inner surface of the resonance hole (20g); external conductors (22, 32) covering the second surface (20b) and the third to sixth surfaces (20c-20f), the external conductors (22, 32) being connected to one end of the intra-resonance hole conductors; and coupling electrodes (23, 33) arranged on the first surface (20a) while being isolated from the external conductors (22, 32) and connected to the other end of the intra-resonance hole conductors (21, 31), the first surfaces (20a) being arranged facing each other so that the coupling electrodes (23, 33

Abstract: Dielectric-filled surface-mounted waveguide devices and methods for coupling microwave energy. In some embodiments, a radio-frequency (RF) waveguide can include a dielectric block having a first edge that joins a mounting surface and a first adjacent surface. The RF waveguide can further include a conductive coating that substantially covers the dielectric block. The conductive coating can define a wrap-around opening that exposes the dielectric block along the first edge. The wrap-around opening can include a strip on the first adjacent surface along the first edge and a strip on the mounting surface along the first edge.

Abstract: Disclosed are embodiments of ceramic radiofrequency filters advantageous as RF components. The ceramic filters can include a ceramic stepped 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, for example, tapered, sectioned, or stair-stepped in order to provide different impedances in the ceramic resonator.

Abstract: Signals on a dielectric waveguide are filtered to pass or block selected frequencies. A combined signal is received in the DWG, wherein the combined signal comprises at least a first frequency signal with a first wavelength and a second frequency signal with a second wavelength. The combined signal is split into a first portion and a second portion. The first portion of the combined signal is delayed by an amount of delay time to form a delayed first portion. The delayed first portion is joined with the received combined signal to form a filtered signal such that the first frequency signal is enhanced by constructive interference while the second frequency signal is diminished by destructive interference. A portion of the filtered signal is provided to a receiver, whereby the amplitude of the second frequency signal is attenuated in the filtered signal.

Abstract: A cavity filter is disclosed, which comprises a cavity, a cover plate, and a connector inner conductor disposed within the cavity, wherein the connector inner conductor passes through the cover plate to be connected with an external circuit board, the connector inner conductor comprises a first inner conductor and a second inner conductor, the first inner conductor is connected with a signal transmission point on the external circuit board, the second inner conductor is connected with an internal signal transmission point inside the cavity, the first inner conductor and the second inner conductor have a gap therebetween and cooperate with each other to form a structural capacitor, and the internal signal transmission point is connected with the signal transmission point on the external circuit board via the structural capacitor. A power amplifying module and a signal transceiving device are also disclosed.

Abstract: A conductor arrangement includes a conductor that extends along a conductor axis. The conductor arrangement also includes a standing wave trap to which the conductor is coupled in order to damp standing waves that are excited by an RF field from outside the conductor arrangement. The standing wave trap is in the form of a dielectric resonator device.

Abstract: A high frequency component includes a multilayer body including a plurality of insulating layers stacked in a stacking direction, linear conductors extending along the insulating layers, interlayer connection conductors extending through at least one of the insulating layers, and planar conductors extending along the insulating layers. The high frequency component further includes transverse coils and internal capacitors. Each of the transverse coils includes the linear conductors and the interlayer connection conductors spirally wound in a plane in a plurality of turns around a winding axis extending in a direction perpendicular or substantially perpendicular to the stacking direction. Each of the internal capacitors includes the planar conductors being opposed to each other such that at least one of the insulating layers is disposed therebetween, the internal capacitor being arranged within a coil opening of the transverse coil when viewed along the winding axis of the transverse coil.

Abstract: A stringed musical instrument comprises a neck and a cavity formed in the neck. The cavity includes a curved bottom surface and a chamfer in a sidewall of the cavity. An island is formed in the cavity. A fretboard is formed comprising a veneer and adapted to fit the cavity. The fretboard includes an opening adapted to encompass the island in the cavity. The cavity or fretboard is formed using a computer-controlled or numerically-controlled milling machine, router, water jet, or laser. The fretboard is mounted within the cavity, and the island in the cavity is disposed within the opening in the fretboard. Mounting the fretboard within the cavity includes flexing a sidewall of the cavity. An edge of the fretboard contacts a sidewall of the cavity without a visible gap.

Abstract: The invention relates to an improved high frequency filter (high pass filter) that is characterized by the following features: in addition to the at least both capacitively coupled inner conductor front faces (5b) or the capacitively coupled inner conductor end segments (5c) of two coupled inner conductor segments (5a), at least one further inner conductor coupling device (15) or at least one further inner conductor coupling element (115) is provided, the at least one further inner conductor coupling device (15) or the at least one further inner conductor coupling element (115) is arranged in an at least partially overlapping manner with the inner conductor end segments (5c) of the coupled inner conductor segments (5b), and the branch line (7) runs between the inner conductor coupling device (15) or the inner conductor coupling element (115) and the outer conductor (1).

Abstract: An adaptable filter made up of cavity resonators. The adaptation takes place by adjusting the connection from the input connector (CN1) of the filter to the input resonator and from the output resonator to the output connector. For adjusting the connection there is a coaxial transfer line (TL1), the outer conductor (OC1) of which is connected by its one end to the wall of the filter casing and by its other end to the outer conductor of the connector (CN1) and the inner conductor of which extends from the middle conductor of the connector to the cavity of the resonator and there into the internal connecting member of the resonator. A middle rod belonging to the inner conductor is surrounded over a certain distance by a cylindrical conductive tuning element, which can be moved by sliding it along the middle rod.

Abstract: Apparatus and method for a radially attachable RF trap attached from a side to a shielded RF cable. In some embodiments, the RF trap creates a high impedance on the outer shield of the RF cable at a frequency of RF signals carried on at least one inner conductor of the cable. In some embodiments, an RF-trap apparatus for blocking stray signals on a shielded RF cable that has a peripheral shield conductor and a inner conductor for carrying RF signals includes: a case; an LC circuit having a resonance frequency equal to RF signals carried on the inner conductor; projections that pierce and connect the LC circuit to the shield conductor; and an attachment device that holds the case to the cable with the LC circuit electrically connected to the shield conductor of the shielded RF cable.

Abstract: A duplex filter includes a block of dielectric material with top, bottom, and side surfaces and first and second spaced-apart sets of through-holes. A pair of outside walls and a center wall extend outwardly from the top surface. A pattern of metallized areas is defined on the top surface of the block including first and second electrodes that extend on the pair of outside walls respectively and third and fourth electrode antennae that extend on the center wall. The block may be two separate blocks coupled together to form an interior layer of metallization separating the first and second sets of through-holes and the center wall separates respective transmit and receive portions of the pattern of metallized areas.

Abstract: An RF filter assembly comprising two filters. In one embodiment, the RF filter assembly comprises a core of dielectric material including a plurality of through-holes and a surface-layer pattern of conductive areas on a top surface of the core that define a first RF filter and a second RF low pass filter is defined, and extends between respective conductive input/output electrodes, on a wall that protrudes outwardly and upwardly from a top surface of the RF filter assembly.

Abstract: The present invention relates to a filter device, the filter device includes a housing provided with a through-hole; and a filter structure includes a signal line; a wave filter connected to the signal line, the size of the periphery of the wave filter smaller than the diameter of the through-hole; a connecter connected to one end of the signal line and connected electrically with the wave filter; wherein the filter structure is arranged from the outside of the housing through the through-hole correspondingly, so that the signal line and the wave filter are arranged at the inside of the housing and the connecter is fixed at the through-hole. Hence, the filter structure is locked and fixed optionally from the outside or from the inside of the housing to increase the convenience of the whole assembly.

Abstract: A filtering apparatus includes a passband of a first-level unit which is formed by at least three coaxial filters covers a passband of a second-level unit which is formed by at least three dielectric filters, and a bandwidth of the first-level unit is twice the bandwidth of the second-level unit, so that when the coaxial filters are coupled to the dielectric filters, insertion loss of the coaxial filters is reduced, thereby reducing overall insertion loss of the filtering apparatus. By making a transmission zero of the first-level unit be located at a second harmonic frequency point of the second-level unit, the filtering apparatus can have high suppression on a second harmonic, thereby obtaining relatively desirable far-end suppression performance.

Abstract: A coaxial resonator includes a dielectric block; a first inner conductor disposed in an inner surface of a first through hole which extends from a first main surface of the dielectric block to an opposite second main surface thereof, the first inner conductor being connected to a reference potential at one side thereof; and an outer conductor disposed over side surfaces of the dielectric block, the outer conductor surrounding the first inner conductor, the outer conductor being connected to the reference potential. There is a low-dielectric-constant portion in a location between the first inner conductor and the outer conductor. The low-dielectric-constant portion surrounds a periphery of the first inner conductor and is lower in dielectric constant than the dielectric block.

Abstract: The invention discloses a high-frequency filter in coaxial design which allows a simple option for tuning resonators contained in the high-frequency filter. In order to tune the resonator(s), a first tuning element is mechanically anchored in the second terminating wall such that the element is rotationally fixed and the axial length thereof cannot be varied, and a second tuning element, the position of which can be varied, is provided in the longitudinal opening of the inner conductor, wherein the second tuning element consists of a dielectric material, or comprises dielectric material, at least in the region facing the second outside wall, wherein the axial position of the second tuning element can be varied in the spacing area between the inside face of the inner conductor and the first tuning element. The second tuning element can be accessed and/or actuated from the outer side of the first terminating wall to effect a variation of the axial position.

Abstract: The microwave signals are coupled from a transmission line embedded in a Printed Circuit Board PCB to a resonant cavity mounted on an external metalized surface of this PCB. The coupling mechanism implements an easy-to-fabricate mechanism leading to high-quality filtering owing to the fact that the end of the transmission line is provided with a metalized feeding pad located at the external layer of the PCB inside the resonant cavity. The resonant cavity is provided with a re-entrant inner stub orthogonal to the PCB and separated from the PCB by a capacitive gap. The metalized feeding pad is facing the inner stub in the area of the capacitive gap and is offset from the axial direction of this inner stub. The metalized feeding pad is further separated from the external metalized surface of the PCB by a surface capacitive gap.