199 results about "Coaxial cavity" patented technology

An intermediate element for a detachable, lockable, ball joint-like connection in a device for the dynamic fixation of bones has a longitudinal axis, an outer wall concentric with the longitudinal axis, and an inner wall forming a coaxial cavity. Either the outer wall or the inner wall comprises one of two contact zones that form the ball joint-like connection. The intermediate element is at least partly made of a super-elastic or visco-elastic material.

The invention discloses a controllable electromagnetic mixed coupling coaxial cavity filter, comprising a conductor housing with two or more resonant cavities opened inside, the top of which is sealed by a conductor cover board and which is provided with a through hole; an input / output device penetrates through the through hole on the conductor hosing; bottoms of two or more conductor resonators are fixed to the conductor housing in contact with the guide housing to form short circuit; the conductor cover board opposite to the tope of the conductor resonator is provided with a tuning screw; an electromagnetic mixed coupling control component is arranged between two adjacent guide resonators which need electromagnetic mixed coupling. The invention accomplishes elliptic filter characteristic with a coaxial cavity filter only with main coupling path, which is provided with the following advantage of small volume, low cost, little insertion loss and nonsymmetrical response.

An apparatus and method for igniting combustible materials in a combustion chamber of a combustion engine using corona discharge plasma from a coaxial cavity resonator. This system and method uses a coaxial cavity resonator in a body adapted to mate with a combustion chamber of a combustion engine. The coaxial cavity resonator is coupled with an energy shaping means that develops the appropriate waveform for triggering radio frequency oscillations in the coaxial cavity resonator. A connection means on the apparatus allows for the apparatus to accept an electrical ignition stimulus from an electronic ignition control system. The coaxial cavity resonator develops corona discharge plasma at a discharge electrode when a sustained radio frequency oscillation results in a standing wave in the coaxial cavity resonator. The corona discharge plasma developed near the discharge electrode ignites the combustible materials in the combustion chamber of the combustion engine.

A quarter wave coaxial cavity resonator for producing corona discharge plasma from is presented. The quarter wave coaxial cavity resonator has a folded cavity made of opposing concentric cavity members that are nested together to form a continuous cavity ending in a aperture. A center conductor with a tip is positioned in the cavity. The folded cavity advantageously permits the coaxial cavity resonator to resonate at a lower operating frequency than an unfolded quarter wave coaxial cavity resonator of the same length. Embodiments of the quarter wave coaxial cavity resonator use narrower apertures to reduce radiative losses, and include center conductors that are reactive load elements, such as helical coils. When a radio frequency (RF) oscillation is produced in the quarter wave coaxial cavity resonator, corona discharge plasma is formed at the tip of the center conductor. The corona discharge plasma can be used to ignite combustible materials in combustion chambers of combustion engines.

The invention is a pipe joint for joining pipes composed of materials that are difficult to adhere. The major elements are an extrudable adhesive; a first pipe having a socket with an inside diameter, where said socket has a mouth, a self-centering bottom with a gasket, a cylindrical wall with a plurality of ports, and an inner annular channel. A second pipe has an insertion section with an squared-off end and a rolled groove. The second pipe having an outside diameter that is less than the inside diameter of the socket, where the difference defines a coaxial cavity with a width. The rolled groove serves as a distribution channel while the adhesive is a liquid, and upon curing the solid adhesive functions as a retaining ring. A flanged annular ring, potentially aided by a compression apparatus, caps the cavity, centers the insertion section, and maintains compression. The adhesive includes alkyl-borane-adhesives.

The invention discloses a calibration system and a calibration method of a partial discharge ultrahigh frequency detection device in the technical field of online detection of the partial discharge of power transformers and gas insulation combination switch devices. The calibration system comprises a standard antenna, a standard pulse source, a detection and control computer and a partial discharge ultrahigh frequency detection device to be detected, wherein the standard pulse source, the detection and control computer and the partial discharge ultrahigh frequency detection device to be detected are connected sequentially. The partial discharge ultrahigh frequency detection device to be detected comprises a sensor for collecting voltage signals. The calibration system further comprises a coaxial cavity, the coaxial cavity is composed of an outer cylinder, an inner cylinder, two outer cones and two inner cones which are coaxial, and a detection window is arranged in the middle of the outer cylinder. The invention also provides the calibration method with the calibration system. The calibration system utilizes the matched coaxial cavity to replace a small GTEM (Giagahertz Transverse Electromagnetic Cell) for the calibration of the partial discharge ultrahigh frequency detection device, and is simple in structure and easy to implement.

The invention discloses a double frequency band filter of a SIR coaxial cavity. The double frequency band filter of the SIR coaxial cavity comprises a CQ-type topological structure formed by coupling of a coaxial SIR in magnetic and galvanic modes. The coaxial SIR is composed of a rod-shaped inner layer metal transmission line, an outer layer barrel-shaped metal wall and a middle medium layer, wherein the outer layer barrel-shaped metal wall shares the same axis with the inner layer metal transmission line which is formed by connecting of two coaxial transmission lines with different diameters. A terminal opening end coaxial borehole is formed at the top end of a terminal opening end of the metal transmission line, and a tuning screw is placed at the top end of the terminal opening end of the metal transmission line to tune. The double frequency band filter is provided with the CQ-type topological structure of 8 cavities, two transmission zeroes are generated on the outside of a double frequency band, so that out-of-band suppression performances are greatly improved. Compared with a traditional duplexer, the double frequency band filter is improved on the aspects of size miniaturization and design complexity in quality mode. The double frequency band filter has the advantages of being small, low in insertion loss, high in double frequency selection properties and the like. The demands on filter performances by a modern communication system are met, and the double frequency band filter can be widely applied in double frequency band mobile communication systems.

This invention relates to a kind of test using resonant cavity for decimetric wave dielectric which can apply direct-current blasing and testing method. The invention belongs to open circuit coaxial line - capacitance clearance resonant cavity; running frequency is 0.2 to 1 GHz. Between bottom end cover of coaxial cavity and internal conductor there is a tubular insulator, forming a small volumetric cirque capacitance, to realize open circuit state of coaxial line lower end. Thus can apply direct-current blasing apply on sample. Upper end cover of coaxial cavity and internal conductor compose 0 to 6mm adjustable capacitance clearance, can measure media sample that has different thickness and diameter, and has 1.5 to 13.5pF capacitance. Designing different coaxial line length can take the measurements under one to four point's frequency. Measuring every resonant frequency and corresponding carrying Q factor of resonant cavity containing or not containing sample, by relate formulae to abstract complex dielectric constant. This system has no parasitic resonance, owing to misproportion characteristic of sample radial electric field, so be able to measuring microwave parameter of stuff which relative dielectric constant as high as 100 .

The invention discloses a resonator utilizing medium block loading. The resonator comprises a resonance cavity, a resonance rod, a loading round disc, a tuning bolt and loading media. The resonator utilizing medium block loading loads media provided with high dielectric constant between the loading round disc and an upper cover plate of a coaxial resonator, effectively reduces resonant frequency of the resonator, enables size of the resonator to be reduced by over a half at most, achieves miniaturization of the resonator, and effectively saves production cost. Size of the coaxial cavity resonator is reduced, power capacity of the resonator is simultaneously increased, and the coaxial cavity resonator is guaranteed to have the advantage of being high in power capacity. The resonator utilizing medium block loading further has the advantages of metal resonators and media resonators.

The invention discloses a coaxial medium phase shifter and related application thereof, and improves a phase shifter of a conventional mobile communication antenna. The phase shifter is used for adjusting the phase of signals flowing through the phase shifter and comprises an inner conductor and an outer conductor; the inner conductor defines at least two parallel conduction arms in an integrated-molding way; the outer conductor is provided with coaxial cavities for each of the conduction arms; the conduction arms are sleeved in the coaxial cavities; and medium elements which move along the axial direction of the coaxial cavities to change the phase of the signals are sleeved between the outer conductor and the conduction arms. The propagation rate of radio frequency signals passing through the phase shifter can be changed by the linear reciprocating movement of the medium elements along the axial direction, so that the phase of the signals is changed to fulfill the aim of phase shift. The coaxial medium phase shifter overcomes fixed thinking modes, changes the structure of a conventional coaxial phase shifter, realizes phase adjustment through the movement of the medium elements relative to the coaxial cavities, optimizes both the electrical and physical properties of the phase shifter, serves as a base element, and has an optimistic application prospect.

An apparatus and method for igniting combustible materials in a combustion chamber of a combustion engine using corona discharge plasma from a quarter wave coaxial cavity resonator. A tapered quarter wave coaxial cavity resonator is adapted to mate with the combustion chamber. The quarter wave coaxial cavity resonator is coupled with an energy shaping means, or waveform generator, that develops the appropriate waveform for triggering radio frequency oscillations in the quarter wave coaxial cavity resonator. A loop coupling is angularly positioned within the quarter wave coaxial cavity resonator to match impedances between the quarter wave coaxial cavity resonator and the energy shaping means, or waveform generator. Radio frequency oscillations produce a standing wave in the quarter wave coaxial cavity resonator and a corona discharge plasma develops near the center conductor. The corona discharge plasma developed near the center conductor ignites the combustible materials in the combustion chamber of the combustion engine.

The invention provides a filtering power divider of an X wave band substrate-based integrated waveguide coaxial cavity. An input and output structure and a substrate integrated waveguide coaxial filtering unit are designed on one side of a dielectric substrate, and a floor is arranged on the outer side of the dielectric substrate; the input and output structure comprise an input end and two output ends; the input end adopts a secondary T-shaped step impedance matching network switched coplanar waveguide feed structure; the substrate integrated waveguide coaxial filtering unit is formed by cascading two substrate integrated waveguide coaxial resonant cavities, and energy is coupled through an opening between the resonant cavities; the two output ends are coplanar waveguide switched micro-strip structures respectively, and a 100-Ohm resistor is connected between the two output ends. The filtering power divider has higher unloaded quality factor, the filtering power divider has remarkable effects for improving the insertion loss of the device and reducing the size of the device, particularly the narrow-band application and performance indexes under relatively high frequency are obviously improved respectively, and the filtering power divider has obvious effects for miniaturization and cost control of modern radar systems.

The invention discloses a stepped impedance resonator (SIR) coaxial-cavity band-pass filter, which is of a comb-shaped filter structure formed by coupling an SIR fundamental resonator unit. The SIR fundamental resonator is composed of three parts of a bar-shaped inner layer metal transmission line, an outer layer cylinder metal wall in coaxial with the inner layer metal transmission line and a middle medium layer. The inner layer metal transmission line is an SIR resonance rod formed by combining two sections of coaxial transmission lines with different diameters. An open circuit coaxial bored hole and a tuning screw are arranged at the top end of the open circuit end of the metal transmission line, and the top end of the open circuit end of the metal transmission line is provided with a windowing coupling screw coupling structure and an input output direct coupling structure. The filter has good spurious frequency rejection characteristics, is small in size compared with a traditional base station, meets requirements of modern communication systems for miniaturization, low insertion loss, high selectivity and wide attenuation band on filters, and can be widely applied to modern mobile communication systems.

The invention discloses an S / X double-band circularly polarization feed source which adopts a coaxial cavity structure and comprises an S frequency band horn, a caliber transforming section, an S frequency band coupling hub, an S frequency band circularly polarization forming network, an X frequency band horn, an X frequency band circular polarizer, a cable component and a waveguide component. The outer cavity of a coaxial cavity comprises the S frequency band horn, the caliber transforming section and the outer cavity of the S frequency band coupling hub, and the inner cavity of the coaxial cavity comprises the X frequency band horn and the inner cavity of the S frequency band coupling hub. The S / X double-band circularly polarization feed source adopts a coaxial feeding source design scheme, the coaxial cavity realizes the radicalization of S frequency band circularly polarization electromagnetic wave, and the X frequency band multimode horn embedded in an inner core of the coaxial cavity structure to be as the feed source realizes the radicalization of X frequency band circularly polarization electromagnetic wave; and according to the design thought of the high-gain S / X double-band circularly polarization feed source, by performing special design aiming at high gain on the S frequency band coupling hub, and smartly combining X feed source design to perform the integrated design of the feed source, the S / X double-band circularly polarization feed source becomes a novel high-gain S / X double-band circularly polarization feed source which covers deep space detection, observation and control communication application frequency bands, and has good radiation property.

The invention discloses a capacitive cross coupling flying bar and a coaxial cavity resonator thereof, and relates to a cavity filter in the microwave communication field. The coupling flying bar is of a centre-symmetrical strip sectional material structure, wherein, the center of the coupling flying bar is equipped with a cylindrical fine-adjusting coupling hole; two ends of the coupling flying bar are respectively equipped with a coupling disk with an annular surface; and two sides of the fine-adjusting coupling hole are respectively equipped with a cylindrical screw fastening hole. The capacitive cross coupling flying bar has the advantages that the flying bar is a new sectional material structural form and is made by cutting a sectional material, wherein, the utilization ratio of the material is high and the machining process is simple, thus facilitating large-scale production; the coupling surfaces of the flying bar are the annular surfaces parallel to the cylindrical surfaces of resonant columns, and the coupling area is large and the distance is consistent, which can realize strong cross coupling by increasing the coupling area in the case of slightly long distance and ensure that a high-power signal can smoothly pass; and coupling coefficients are finely adjusted by a fine-adjusting coupling screw, which solves the problem of offset of the coupling coefficients caused by machining and assembly accuracy and ensures debugging consistency.

The construction is a coaxial cavity resonator (20, 30, 40, 50) comprising at least one conductive body (11, 31), which body is open at one end and shortened from a quarter-wave resonator. The conductive body includes a main rod (16), which is in one end attached to the cavity wall (15), and a main disc (17) attached to the free end of the main rod (16). The cavity (12) further comprises one or more conductive plates (21, 41, 51) located between the main disc (17) and the side walls (13), at the first side (17a) of, and out of galvanic contact with, the main disc (17). The shortening is carried out by creating air-insulated extra capacitance between the resonator cavity walls via the conductive plates and a mechanical structure at the open end of the conductive body.

A phase shift is defined as a point in frequency at which the phase is changed from 0 degrees to 180 degrees. A device is provided for combining analog and digital in-band-on-channel (IBOC) signals to feed a common antenna utilizing phase shifting allpass filter modules to provide a 180 degree phase shift to specific IBOC channels within a constant impedance dual-hybrid circuit. The IBOC Allpass combiner includes one input 90 degree 3 dB quadrature hybrid coupler, one output 90 degree 3 dB quadrature hybrid coupler, a load resistor, and two phase shifting allpass filter modules. Each phase shifting allpass filter module is comprised of a two coaxial cavity resonators coupled to a 90 degree 3 dB quadrature hybrid coupler. Components and modules are coupled using mating transmission lines. The four coaxial cavity resonators are used as devices to produce two distinct phase shifts at isolated upper and lower IBOC side band frequencies. The circuit is designed for one center analog frequency and two sideband IBOC OFDM carrier frequencies, such that all frequencies will combine in phase at the common antenna input with minimal loss and minimal group delay. Out of phase and spurious emissions are ported to the load resistor.

The invention provides a ceramic dielectric multi-mode filter which comprises a multilayer circuit board, multiple dielectric resonators which are arranged in lines and close to each other and two radio-frequency connectors. The two radio-frequency connectors are in electric connection with the multilayer circuit board, two adjacent dielectric resonators are coupled with each other through a plane coupling structure, each dielectric resonator is a ceramic dielectric resonator, the multilayer circuit board is provided with a feed network, the resonators which are located at the two ends of one line of the resonators are in electric connection with the feed network, and the two radio-frequency connectors are in electric connection with the feed network. Each plane coupling structure can be a coupling window which is formed on a metal coating of a resonator attached end face, or a coupling window which is clamped on a metal coupling diaphragm between the two adjacent resonators. The invention further provides an assembly method of the ceramic dielectric multi-mode filter. Compared with a traditional metal coaxial cavity filter, the ceramic dielectric multi-mode filter has the advantages of being small in size, light in weight, good in cross-modulation performance, high in Q value and the like.

The invention discloses a coaxial cavity dual-band filter based on a stepped impedance structure. The filter provided by the invention is formed by coupling of several stepped impedance coaxial cavity resonator units. Each stepped impedance coaxial cavity resonator unit is composed of three parts, namely two rod-shaped solid metallic conductors, a tubular metallic wall and a filler. The filler is air and is positioned in a resonant cavity between the tubular metallic wall and the rod-shaped solid metallic conductors. The upper and lower ends of the tubular metallic wall are provided with outer cover plates for sealing the resonant cavity. The several stepped impedance coaxial cavity resonator units are arranged in a linear parallel structure. The two rod-shaped solid metallic conductors are two coaxial cylinders with different diameters and are divided into a lower conductor cylinder and an upper conductor cylinder. The two conductor cylinders are connected in series up and down. The lower conductor cylinder is electrically connected with a feeder line of an input or output port. According to the invention, two passbands are realized by the stepped impedance coaxial cavity resonator units; passband frequency ratio adjustable range is large; the size of the filter is small; and the structure of the filter is simple and reasonable.

The invention discloses a coupling device of a metal coaxial cavity and a medium resonant cavity. A cavity wall is arranged between a metal coaxial resonator and a medium resonator and divides a cavity body into the metal coaxial cavity and the medium resonant cavity. The two cavities are coupled through a reversed-L-shaped coupling window or a 7-shaped window, wherein the reversed-L-shaped coupling window or the 7-shaped window is formed by the cavity wall and the top face and the side faces of the cavity. A good coupling effect can be obtained, meanwhile, the shape of the coupling window is regular, machining process is simple, and production efficiency is high.

The invention discloses a parallel open-circuit stepped impedance low-pass filter which is suitable for low waveband signal filtering in a broadband frequency sweeping super-heterodyne spectrum analyzer. Firstly, a fifteen-order parallel open-circuit stepped impedance strip line elliptic function low-pass filtering unit is constructed based on a microwave sheet material and used for meeting the requirement for filtering a low-frequency signal; secondly, a eleven-order parallel open-circuit stepped impedance strip line elliptic function low-pass filtering unit is constructed based on the microwave sheet material and used for meeting the requirement for filtering a high-frequency signal; thirdly, the fifteen-order parallel open-circuit stepped impedance strip line elliptic function filtering unit and the eleven-order parallel open-circuit stepped impedance strip line elliptic function filtering unit are cascaded to form a twenty-six-order strip line low-pass filtering module. The twenty-six-order strip line low-pass filtering module is used for meeting the requirements for filtering the high-frequency signal and the low-frequency signal. The defects that a coaxial cavity low-pass filter is large in size, and port matching is not prone to being improved are overcome, besides, high-quality signal output is achieved, the product size is shrunk and power consumption is reduced.

The invention discloses a controllable electromagnetic coupling dielectric resonator filter, which comprises a conductor shell, wherein two or more dielectric resonators which operate in a TE01 delta mode are arranged in the conductor shell; the top part of the conductor shell is closed by a conductor cover plate; an input / output device passes through the conductor shell to feed electromagnetic energy in the filter and discharge the electromagnetic energy out of the filter; a tuning screw is arranged on the conductor cover plate just opposite to the top part of the dielectric resonators; the bottom part of the tuning screw is connected with a tuning disc; and an electromagnetic coupling control component is arranged between two adjacent conductor dielectric resonators requiring controllable electromagnetic coupling. In the invention, an elliptic function filtration property is realized by using a coaxial cavity filter only having a main coupling path, and the controllable electromagnetic coupling dielectric resonator filter has the advantages of small volume, low cost, small plug-in consumption and asymmetric response.

Dielectrics fixed on holders respectively provided at semi-coaxial cavity resonator stages are movably inserted through an outer conductor. The holders projecting out of the outer conductor are coupled to a coupling member, and the coupling member is directed to slide or turn, so that distances between the dielectrics and the inner conductors of the resonators are varied, and accordingly frequencies of the resonators are varied at the same time. Accordingly, there is provided a tunable filter that avoids an increase in insertion loss, is high-power resistant, does not cause intermodulation, and allows a center frequency of the filter to be varied steplessly and quickly.

The invention provides an HF / VHF frequency-range ultra wide band electromagnetic pulse protection module comprising a coaxial cavity low-pass filter, a gas discharge tube, a high-power TVS (Transient Voltage Suppressors) tube and a low-power TVS tube, wherein the two ends of the coaxial cavity low-pass filter are connected to coaxial ports through copper leads, respectively; the gas discharge tube and the high-power TVS tube are connected in series and then connected between the copper lead at one end of the coaxial cavity low-pass filter and a ground wire; and the low-power TVS tube is connected between the copper lead at the other end of the coaxial cavity low-pass filter and the ground wire. In the coaxial connection manner, the module can be conveniently mounted on a coaxial signal wire between an outdoor cable (including an antenna) and an indoor electronic device so as to discharge ultra wide band electromagnetic pulses coupled to the signal cable; therefore, the module is capable of protecting HF / VHF frequency-range sensitive devices from the damage of the pulse energy.

The invention discloses a multi-cavity filter taking a coupled dual-gap cavity as a basic unit. The multi-cavity filter consists of two or more coupled dual-gap resonant cavity basic units enclosed by a cavity shell. The problems of narrow 1dB bandwidth and large size of the conventional coaxial cavity filter are solved; a wide 1dB bandwidth can be obtained by using a few cavity units; the provided metal cavity filter is high in power, wide in frequency band, small in size and light in weight; and the strength of coupling between every two cavities is optimal, and a high-power microwave filter meeting the bandwidth requirements of a mobile communication base station filter is designed.

A coaxial cavity gyrotron with two electron beams includes an electron gun (magnetron injection gun, “MIG,” with two beams), a coaxial beam-wave interaction cavity and an outer magnetic field tube. The coaxial beam-wave interaction cavity consists of two parts: an outer conductor and an inner conductor. The two hollow electron beams produced by the MIG are located between the outer conductor and the inner conductor. The MIG includes inner and outer anodes, with a single cathode located between the anodes. The cathode further includes two emitter rings which produce the two hollow electron beams. The entire gyrotron is immersed in the magnetic field tube such that the magnetic field profile is the same or similar to that for a coaxial gyrotron with one electron beam.

The invention provides a coupled cavity for gyro-traveling wave amplifiers, which consists of a plurality of compound cavities in cascade connection, wherein each compound cavity has an outer coaxial cavity and an inner cylindrical cavity; the working mode of the inner cylindrical cavity is a TE0n circular electric mode; a common wall of a plurality of rectangular coupling holes is arranged between the inner cylindrical cavity and the outer coaxial cavity; two ends of the inner cylindrical cavity and the outer coaxial cavity in the axial direction are provided with vertical walls mutually perpendicular to the common wall; the vertical walls are axially provided with circular holes for providing electron beam channels and the coupling conversion or stop of working modes; and the vertical walls on the right side of the cavities with even serial numbers are provided with a plurality of sector coupling holes for the mode coupling of the adjacent outer coaxial cavities. In order to overcome the disadvantages that traveling wave interaction has relative instability and resonance interaction is narrow in frequency band, the coupled cavity transmits electromagnetic wave between every two adjacent resonant cavities so as to form the intercoupling resonance and alternate transmission-advance-coexistence of the electromagnetic in a plurality of resonant cavities, is used for high-frequency interaction circuits, enhances the interaction of electron beams with microwaves and millimeter waves, and expands working band.