Abstract: A high frequency filter A1 has frequency characteristics such that the amount of attenuation for an input electrical signal is smaller in a first frequency band f1 than in a second frequency band f2. The high frequency filter A1 is provided with a dielectric elastomer transducer 1 that includes a dielectric elastomer layer 13 and a pair of electrode layers 14 sandwiching the dielectric elastomer layer 13. The frequency characteristics are variable by the dielectric elastomer transducer 1. This configuration provides a high frequency filter having frequency characteristics that are variable and suitable for a lightweight and compact configuration.

Abstract: A resonant cavity filter includes a housing having a resonator therein, and a tuning element including an elongated pin member having a conductive outer surface. The tuning element is mounted for insertion of the elongated pin member into an interior of the resonator. The conductive outer surface includes a contact portion by which the elongated pin member is secured in a desired position to adjust a frequency response of the resonant cavity filter, where the contact portion is free of threading.

Abstract: Embodiments relate to the field of technologies of components of communications devices, and provide a dielectric filter, which resolves a problem that a solid dielectric filter has a difficulty in implementing capacitive coupling. The dielectric filter includes at least two dielectric resonators, where each of the dielectric resonators includes a body made of a solid dielectric material, and an adjusting hole located on a surface of the body. The adjusting hole is a blind hole, configured to adjust a resonance frequency of the dielectric resonator on which the blind hole is located. The bodies of all the dielectric resonators included by the dielectric filter form a body of the dielectric filter.

Abstract: The present disclosure relates to a communication method and system for converging a 5th-Generation (5G) communication system for supporting higher data rates beyond a 4th-Generation (4G) system with a technology for Internet of Things (IoT). The present disclosure may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services. A cavity filter is provided. The cavity filter includes a plate of the cavity filter and including a feeder part for supplying an electrical signal, a housing forming an exterior of the cavity filter and coupled to the plate to form a shielded space inside the cavity filter, and a metal structure having a first end coupled to an inside of the housing and a second end that extends toward the feeder part and resonates to filter frequencies in the shielded space.

Abstract: A coaxial filter comprises a housing that surrounds a receiving space. The housing comprises a trough-shaped housing element with sidewalls and a front wall. The housing further comprises a further trough-shaped housing element, wherein the two trough-shaped housing elements are placed on top of one another, thus forming the receiving space; or a lid arrangement which, together with the trough-shaped housing element forms the receiving space. At least one resonator inner conductor arrangement comprises a connecting bridge, with which resonator inner conductors are conductingly connected.

Abstract: A cavity filter includes a cavity, a cover plate, a tuning component, and a resonant column. The cover plate is connected to the cavity, and the cover plate is configured to cover the cavity to form a resonant cavity. A through hole is provided on the cover plate, and the tuning component passes through the through hole and is fastened on the cover plate. The tuning part includes a high-conductivity part and a non-conductivity part, the high-conductivity part is located in the cavity, and the resonant column is in the cavity.

Abstract: Designing a filter with desired characteristics is made easy. A filter (1) includes a plurality of resonators (10 to 50) which are electromagnetically coupled. The plurality of resonators (10 to 50) each have a broad wall (11, 12, 21, 22, 31, 32, 41, 42, 51, 52) that is in a shape of a circle or a regular polygon with six or more vertices, and two resonators, which are coupled together, of the plurality of resonators (10 to 50) are arranged such that D<R1+R2 is satisfied, where R1 and R2 represent radii of circumcircles of the broad walls of the two resonators and D represents a center-to-center distance between the two resonators.

Abstract: A device capable of moving a component of the device motion is capable of determining audio data corresponding to a direction relative to the device (“beamforming”). When the component moves, the device determines a new position of the component and selects one of a set of beamforming filter coefficients corresponding to the position. Using the filter coefficients, the device determines the directional audio data.

Abstract: Apparatuses, methods of assembling a resonator, and methods of tuning a resonator are provided. An example apparatus may include at least one resonator comprising a resonator hole defined within the resonator and defining an inner wall of the at least one resonator, a tuning cover comprising at least one hollow rod, and a tuning element comprising a bottom flanged portion. The tuning element may be configured to be inserted into the at least one hollow rod and the bottom flanged portion is configured to cover at least a bottom portion of the hollow rod. The bottom flanged portion of the tuning element is configured to be positioned between the at least one hollow rod and the inner wall of the at least one 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: The present invention provides a cavity filter having a slim and compact structure in which a push-pin type RF connector, which is formed such that a terminal is exposed to both sides or one side in a height direction, is embedded so as to reduce a size of an antenna system, quickly perform verification for an individual cavity filter while having high reproducibility, and enable the antenna system to be readily mounted.

Abstract: This tunable bandpass filter is provided with: a conductive member having a plurality of resonance rods protruding so as to be aligned in a single plane; a dielectric plate disposed parallel to the single plane; a drive part which is attached to the dielectric plate and drives the dielectric plate in directions parallel and perpendicular to the single plane; and a waveguide containing at least the resonance rods and the dielectric plate.

Abstract: An input/output apparatus of a multiplexer is provided, including: a main tap and at least two branch taps of the main tap, where each of the at least two branch taps is configured to couple to a different resonant cavity in the multiplexer, and the at least two branch taps include a first branch tap and a second branch tap; a coupling polarity of the first branch tap is opposite to that of the second branch tap; and a coupling calculation frequency of the second branch tap is closest to a coupling calculation frequency of the first branch tap. The input/output apparatus of the multiplexer enables two channels with closest frequencies to use different coupling polarities. Because the coupling polarities are different, signals naturally do not interfere with each other, and signal interference between channels is eliminated in principle. The embodiments of the present disclosure further provide a corresponding multiplexer.

Abstract: Disclosed is a multimode microwave filter including a resonator in which a cavity is formed to generate a resonant mode and a plurality of irises formed on a side surface of the resonator, in which the cavity of the resonator has a rhombus-shaped cross section.

Abstract: An integrated circuit package includes a die. An electrically conductive layer comprises a redistribution layer (RDL) in the die, or a micro-bump layer above the die, or both. The micro bump layer comprises at least one micro-bump line. A filter comprises the electrically conductive layer. A capacitor comprises an electrode formed in the electrically conductive layer.

Abstract: Embodiments relate to the field of technologies of components of communications devices, and provide a dielectric filter, which resolves a problem that a solid dielectric filter has a difficulty in implementing capacitive coupling. The dielectric filter includes at least two dielectric resonators, where each of the dielectric resonators includes a body made of a solid dielectric material, and an adjusting hole located on a surface of the body. The adjusting hole is a blind hole, configured to adjust a resonance frequency of the dielectric resonator on which the blind hole is located. The bodies of all the dielectric resonators included by the dielectric filter form a body of the dielectric filter.

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 high-frequency filter with a coaxial design has at least one resonator with a first inner conductor and an outer conductor housing. The outer conductor housing comprises a housing base, a housing cover which is arranged at a distance from the housing base, and a peripheral housing wall between the housing base and the housing cover. The first inner conductor is galvanically connected to the housing base and extends axially from the housing base in the direction of the housing cover. The resonator comprises a second internal conductor which is galvanically connected to the housing cover and extends axially from the housing cover in the direction of the housing base. The first and/or second inner conductor has an inner conductor bore, and a tuning element is arranged in one inner conductor bore in a thread-free axially movable manner. The tuning element is arranged in a sleeve or bushing and optionally or in addition thereto has an enlarged elastic region.

Abstract: A filter of the present invention creates a cavity filter that can be embedded within the inner layers of a printed circuit board. The embodiment can provide for a tunable microwave filter with lower loss, lower manufacturing cost and higher production yields. In addition, the tunable microwave includes a temperature compensation means to accommodate an electrical characteristic of filter with regard to the temperature variation. Such temperature compensation embodiment can be embedded into the upper layer communicably associated with the processor. For performing intelligent temperature compensation, the processor can include a look-up table of tuning values for controlling can store a set of temperature offset value that can modify the tuning table.

Abstract: An RF cavity filter is disclosed. The disclosed filter includes: a housing in which there is at least one cavity formed; a cover joined to an upper portion of the housing; at least one bolt inserted through at least one through hole formed in the cover; and at least one elastic element attached to the cover in an area below the through hole, where the bolt is inserted through the through hole to provide an external force on the elastic element, and the external force alters the shape of the elastic element. With the disclosed filter, pieces of metal debris created during tuning can be prevented from reaching the inside of the filter, and the degradation in the PIMD performance that would have otherwise occurred due to the pieces of debris can be avoided. Also, the filter can maintain a tuned state without the use of separate nuts.

Abstract: A filter device includes a transmission line formed by an electrically conducting strip printed on a surface of an electrically insulating substrate, the conducting strip having two ends respectively forming the two sole input and output connection ports of the filter device, and a plurality of resonators, each resonator including an electrically conducting strip printed on the surface of the substrate. The conducting strip of each resonator has a first end coupled to the transmission line and at least one second end that is free or connected to a ground so as to create an effective fundamental resonant wavelength specific to each resonator. For each pair of neighboring resonators of the plurality of resonators, the distance between the first ends of the two neighboring resonators is less than one tenth of the smallest effective fundamental resonant wavelength of the plurality of resonators.

Abstract: The present disclosure provides a radio frequency filter having a cavity structure including a housing, a cover and a resonance element. The housing has a hollow interior for providing a cavity, and an open side. The cover shields the open side of the housing. The resonance element is positioned in the hollow interior of the housing, and has a planar portion and a support for supporting and fixing the planar portion to the housing. The planar portion of the resonance element has at least two through holes, and the support has a lower end portion formed with a male thread structure for screw fastening. The housing is formed with a female thread structure to be screw fastened with the male thread structure formed at the lower end portion of the support.

Abstract: A cavity filter includes a housing, the housing includes resonant cavity groups, each of the resonant cavity groups has two resonant cavities, a partitioning portions is provided between the two resonant cavities, and the partitioning portions is provided with an adjustment passage running through the two resonant cavities. A cover plate is mounted on the housing to cover the resonant cavity groups. A resonating assembly includes a resonant tube, a resonant cap connected with the resonant tube, and a resonant adjustment screw provided in the resonant tube. The resonant tube is disposed on the inner wall of the resonant cavities. The resonant cap is opposite the cover plate. A coupling adjustment assembly is used for reducing the magnetic coupling amount between the two resonant cavities and enhancing the electrical coupling amount between the two resonant cavities.

Abstract: A tunable filter includes a first waveguide body, a second waveguide body, a metal plate, a tuning piece, and a driving piece. A first cavity is disposed in the first waveguide body, and a second cavity is disposed in the second waveguide body. The metal plate is sandwiched between the first waveguide body and the second waveguide body, multiple windows are disposed on the metal plate, and the first cavity and the second cavity are in communication and are symmetrically distributed on both sides of the metal plate. The tuning piece includes a dielectric pull-rod and multiple metal sheets connected to the dielectric pull-rod, the dielectric pull-rod protrudes out of the first waveguide body and is connected to the driving piece, the multiple metal sheets are disposed inside the first cavity, and the multiple metal sheets are disposed corresponding to the multiple windows.

Abstract: Embodiments of radio frequency (RF) filtering circuitry are disclosed. In one embodiment, the RF filtering circuitry includes a first port, a second port, a first RF filter path, and a second RF filter path. The first RF filter path is connected between the first port and the second port and includes at least a pair of weakly coupled resonators. The weakly coupled resonators are configured such that a first transfer response between the first port and the second port defines a first passband. The second RF filter path is coupled to the first RF filter path and is configured such that the first transfer response between the first port and the second port defines a stopband adjacent to the first passband without substantially increasing ripple variation of the first passband defined by the first transfer response.

Abstract: A filtering switch based on dielectric resonator is disclosed which comprising a rectangular dielectric resonator, a metal cavity in which the dielectric resonator is located, a switch circuitry and a T-shape feeding line structure. The ON- and OFF-states of the filtering switch based on dielectric resonator are realized by controlling a coupling between the dielectric resonator and the feeding line structure. EM fields of the rectangular dielectric resonator and T-shape feeding line structure have been theoretically analyzed and utilized to guide the coupling control. The results have shown low ON-state loss, high power capability and high OFF-state isolation. Transmission zeros are generated at both sides of the passband by cross coupling between dielectric resonators or between feeding line structures and coupling line structures, resulting in high skirt selectivity.

Abstract: A microwave filter has a housing defining an inner cavity. A first resonator is positioned in a first portion of the inner cavity. A second resonator is positioned in a second portion of the inner cavity. A third resonator is positioned in a third portion of the inner cavity. The first resonator and the third resonator are cross-coupled via an iris. The second resonator is elongated and is coupled to the first resonator and the third resonator. The resulting microwave filter has a frequency response having a transmission zero in the lower stopband. A high-pass filter is realized without the use of a cross-coupling probe.

Abstract: The present invention relates to a radio frequency filter having a cavity structure, comprising: a container which has a hollow inner portion and a cavity that is cut off from the outside, and a resonance element which is placed in the hollow inner portion of the container, wherein the container has a wrinkled structure for adjusting the intervals between a longitudinal front end surface of the resonance element and the inner surfaces of the container facing the longitudinal front end surface using external pressure. Thus, the invention can be further miniaturized and is lightweight, and the design of the invention enables frequency tuning without employing a coupling structure of a tuning screw and a fastening nut, thereby obtaining a convenient and simplified structure.

Abstract: Disclosed is an indirect transmission type automatic frequency modulation filter including a microwave body, a moving plate, a fastener, and a motor unit. The microwave body has plural openings. The moving plate includes a board, plural lugs and a first moving member, and the lugs and the first moving member form the board. The fastener includes a support base and a second moving member. The motor unit includes a rod and a driver, and the driver determines a clockwise rotation or a counterclockwise rotation and drives the rod to move the moving plate towards or away from the microwave body so as to insert the lugs into cavities to a desired depth and adjust a center frequency.

Abstract: A cavity resonator or filter constructed on electromagnetic bandgap (EBG) substrate is provided that includes an external controlling assemble having a plurality of components configured to change a working frequency of the cavity resonator or filter. A dual-band bandpass filter is provided that includes two or more single band filters on a single EBG substrate and an external controlling assemble having a plurality of components configured to change a working frequency of the cavity resonator or filter.

Abstract: An antenna (10) includes: a first radiant element (3) and a second radiant element (4), which are connected to an antenna feeding point (2); a first branch part (5a), one end of which is connected to the first radiant element (3) at a position not corresponding to an end portion of the first radiant element (3); a second branch part (5b), one end of which is connected to the second radiant element (4) at a position not corresponding to an end portion of the second radiant element (4); and a connection element (7), which connects part of the first radiant element (3) and part of the second radiant element (4). A different end of the first branch part (5a) and a different end of the second branch part (5b) face each other and form a capacitor part. The capacitor part is positioned outside the area surrounded by the connection element (7), the first radiant element (3), and the second radiant element (4).

Abstract: One or more adjustable resonators (208, 209) of a compensation circuit are arranged so that adjusting the resonators nevertheless results in output of the circuit remaining substantially constant. This has been accomplished by separating resonator cavities that include the adjustable resonators by a partition wall. A coupling aperture (205) provides inductive coupling between the resonator cavities and a capacitive part (206) passes through the intermediate wall and provides a capacitive coupling between the resonator cavities. The capacitive part is conductive and electrically isolated from the partition wall. The capacitive part and the coupling aperture are dimensioned such that effects on the coupling band width of the aperture and capacitive couplings track each other so as to substantially cancel each other out, and that the coupling band width between the resonator cavities remains substantially constant.

Abstract: The present disclosure relates to an overvoltage-protection device for protecting a high-frequency terminal from overvoltage. Overvoltages can be compensated by a coil arrangement, which includes coils electrically in series with different, increasing inductances. The end of the relatively thinner coil is connected to the high-frequency terminal of a circuit.

Abstract: Provided is a bandpass filter (10), including: a filter casing (17) defining a rectangular waveguide (11) having a narrow plane (a) and a broad plane (b); a metal plate (12) having a ladder shape and being arranged in a sandwiched manner inside the filter casing (17) at a center of the broad plane (b) so as to be parallel to the narrow plane (a); a dielectric plate (13) positioned in a vicinity of the metal plate (12); a support rod (14) extending in parallel to a longitudinal direction of the rectangular waveguide (11), the support rod (14) being rotatably supported on the filter casing (17) and configured to support the dielectric plate (13); and a first gear (15) fixed at a tip of the support rod (14). The dielectric plate (13) is rotated along with rotation of the first gear (15), to thereby adjust a bandpass frequency.

Abstract: A microwave filter has a housing defining an inner cavity. A first resonator is positioned in a first portion of the inner cavity. A second resonator is positioned in a second portion of the inner cavity. A third resonator is positioned in a third portion of the inner cavity. The first resonator and the third resonator are cross-coupled via an iris. The second resonator is elongated and is coupled to the first resonator and the third resonator. The resulting microwave filter has a frequency response having a transmission zero in the lower stopband. A high-pass filter is realized without the use of a cross-coupling probe.

Abstract: RF filter structures are disclosed that may have multiple filter paths, which are provided by weakly coupled resonators. The filter paths may be interconnected so that additional filter paths may be realized between input and output terminals of the RF filter structures. In this manner, the weakly coupled resonators from the filter paths may be arranged in a matrix. In one embodiment, an RF filter structure includes a first filter path and a second filter path. The first filter path includes (at least) a first pair of weakly coupled resonators while a second filter path that includes (at least) a second pair of weakly coupled resonators. To interconnect the first filter path and the second filter path, a cross-coupling capacitive structure is electrically connected between the first filter path and the second filter path. As such, an additional filtering path may be realized through the interconnection provided by the cross-coupling capacitive structure.

Abstract: The apparatus includes a base having a hole in a top surface, a fastener having a longitudinal section with the longitudinal section extending into the hole, and a shell. The shell has a connecting section connecting a first lateral surface section and a second lateral surface section. At least a portion of the first lateral surface section extends into the hole. The second lateral surface section extends away from the top surface of the base. The connecting section is disposed between the top surface of the base and a portion of the fastener. The connecting section has a first section and a second section, and the first section has a non-linear cross-section. The apparatus further includes a washer disposed between the portion of the fastener and the connecting section, and a portion of the washer engages the first section of the connecting section.

Abstract: Various exemplary embodiments relate to a filter configured to operate in an operational frequency range. The filter may include a mainline, at least one combline resonator coupled to the mainline, an input port coupled to the mainline, and an output port coupled to the mainline. The mainline may include at least one non-resonant node. The at least one non-resonant node may be configured to resonate in a frequency range outside of the operational frequency range of the filter, and the at least one combline resonator may be configured to resonate in a frequency range within the operational frequency range of the filter.

Abstract: A frequency tunable filter is disclosed. The frequency tunable filter includes a filter unit that can tune a frequency band of a frequency signal being filtered, a communication module that receives a control signal for controlling the tuning of the frequency band, and a control unit that controls the tuning of the frequency band based on the control signals. The disclosed filter can control the tuning of the filter's frequency band wirelessly.

Abstract: A cavity filter having two series of resonance chambers bilaterally connected between an antenna port and two opposing signal input/output ports in a resonant space therein, each series of resonance chambers having the last resonance chamber thereof connected to the antenna port and the first resonance chamber thereof connected to the respective signal input/output port and kept in communication with the associating last resonance chamber through one respective channel and the second resonance chamber thereof kept in communication with the last second resonance chamber thereof through one respective channel to provide cross-coupling feedback, getting better stop-band flatness and improving signal quality.

Abstract: An apparatus to filter electromagnetic waves includes a cavity and one or more tuning circuits. The cavity is configured to receive the electromagnetic waves and has a resonant frequency. The one or more tuning circuits are disposed proximate to or in the cavity. The one or more tuning circuits and the cavity are configured to filter the electromagnetic waves and the resonant frequency of the cavity is based on the one or more tuning circuits.

Abstract: A filter includes a first printed circuit board (PCB), poles mounted on the first PCB, a second PCB located at a top of the first PCB, and caps mounted on the second PCB and covering the poles. Each the cap surrounds the corresponding pole. The cap and the pole cooperatively form a resonator. Each the first PCB and the second PCB is made of light, dielectric material with metallic layers.

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 cavity filter includes a slider, a driving device, an adapter and a resilient member. The slider is used to slide relative to and couple with a plurality of resonators located in the cavity filter to change a resonating frequency of the cavity filter. The driving device is used to drive the slider slide relative to the plurality of resonators. The adapter is installed between the slider and the driving device. The resilient member is elastically connected between the slider and the adapter and used to absorb vibrations of the driving device to make the slider move on an even keel.

Abstract: A resonance tube, a method for manufacturing a resonance tube, and a cavity filter, which relate to the field of communications devices and can provide a temperature compensation effect of different degrees, reduce a production cost, and improve production efficiency. The resonance tube is manufactured using powder materials, and the powder materials include at least one of carbonyl iron powder and iron powder and at least one of carbonyl nickel powder and nickel powder, a mass percentage of the at least one of carbonyl iron powder and iron powder in the powder materials is 58-70%, and a mass percentage of the at least one of carbonyl nickel powder and nickel powder in the powder materials is 30-42%. The present invention may be used on a communications device, for example, a base station.

Abstract: A filter includes a plurality of resonance cavities, where a resonance tube and a tuning bolt penetrating into space enclosed by the resonance tube are disposed in each resonance cavity; further includes a tuning part disposed between the tuning bolt and the resonance tube, where the tuning part and the resonance tube form a first capacitor, and the tuning part and the tuning bolt form a second capacitor; and further includes an adjusting structure used for rotating the tuning part, so as to change relative areas between the tuning part and the resonance tube and between the tuning part and the tuning bolt, so that the first capacitor and the second capacitor change synchronously. In the present invention, the tuning part is disposed between the tuning bolt and the resonance tube, so that the tuning part forms a double-capacitor structure with the resonance tube and the tuning bolt.

Abstract: A tunable filter device that changes a central frequency and a bandwidth is provided. The tunable filter device may include a body forming a cavity together with a cover, a resonator attached to or integrally formed on a lower surface of the cavity, a frequency-tuning element including a head and a shaft, the shaft passed through the cover and inserted in the resonator, and a cam disposed on the head to contact the head, wherein an insertion length of the shaft is controlled by the cam.

Abstract: A microwave filter has a housing defining an inner cavity. A first resonator is positioned in a first portion of the inner cavity. A second resonator is positioned in a second portion of the inner cavity. A third resonator is positioned in a third portion of the inner cavity. The first resonator and the third resonator are cross-coupled via an iris. The second resonator is elongated and is coupled to the first resonator and the third resonator. The resulting microwave filter has a frequency response having a transmission zero in the lower stopband. A high-pass filter is realized without the use of a cross-coupling probe.

Abstract: This invention provides novel combline resonators with multiple conductors and multiple dielectrics for compact filters and multiplexers with improved electric response. The novel combline resonator consists of multi-conductors being made up for the simplest case of an inner metallic post, an intermediate conductor, and an enclosure. This structure provides two resonant modes that can be used for realizing compact microwave filters and multiplexers. Such filters offer the low cost, compact size and ease of manufacturing features of traditional combline resonator filters, with additional size reduction due to the fact that a single physical cavity provides two electrical resonators. In addition, the new cavity inherently introduces a transmission zero in the guard-bands enhancing the filter selectivity.

Abstract: A cavity filter includes a housing having a positioning portion, a cover on top of the housing which have a pair of first positioning holes, a sliding plate with movably support on the positioning portion and mounted between the positioning portion and the cover to be configured to adjust a resonating frequency of the cavity filter, and a tuning structure fixed on the cover and having a pair of first positioning poles. The sliding plate includes a plurality of elastic arms, each of which is made of insulated material and supported by the positioning portion. Each of the pair of first positioning poles extends through the corresponding first positioning holes to touch the corresponding one of the plurality of elastic arms of the sliding plate.