40 results about "Coaxial cavity" patented technology

The invention provides a metal wire conductivity testing device and method based on a coaxial resonant cavity, and belongs to the technical field of conductivity testing. According to the device, a sample clamping mode is innovatively set, and pressure is applied to the two ends of a metal wire, so that the sample in the cavity is subjected to obliquely downward pulling force, the sample to be tested is always kept in a straight state in the testing process, the flatness of the sample is ensured, and the problem that the middle part is bent due to light weight of the sample to be tested in a conventional lofting test is solved. The field distribution between the inner conductor and the outer conductor is destroyed, so that the working mode is not a strict TEM mode any more, and the test accuracy is improved; in addition, the coaxial cavity short-circuit surface cavity and the cover in the device are separated, so that the samples with different sizes can be tested only by replacing the end cover when facing the samples with different sizes, and the operation is simple, convenient and easy to implement.

The invention relates to a radio frequency resonant cavity based on a short-circuit sliding block. The radio frequency resonant cavity comprises an input coaxial transmission line; the connector is connected with the input coaxial transmission line; the first output coaxial transmission line and the second output coaxial transmission line are connected with the connector. The first shifting mechanism is arranged on the first output coaxial transmission line, and the second shifting mechanism is arranged on the second output coaxial transmission line; each of the first output coaxial transmission line and the second output coaxial transmission line comprises an inner conductor, a short-circuit sliding block and an outer conductor, the outer conductor coaxially sleeves the inner conductor, a coaxial cavity is formed between the outer conductor and the inner conductor in a matching manner, and the short-circuit sliding block is connected with the first displacement mechanism and the second displacement mechanism; the short-circuit sliding block is movably arranged in the coaxial cavity. According to the ion cyclotron wave power transmission system, the effect of obtaining large voltage by means of small power is achieved, possible sparking points can be detected under the working condition of large voltage, then measures are taken in advance to prevent the sparking phenomenon, and stable operation of the ion cyclotron wave power transmission system is guaranteed.

The invention relates to an integrated nursing device for eliminating thrombus in a PICC (Peripherally Inserted Central Catheter) by ultrasonic waves, which belongs to the technical field of medical instruments and comprises a handheld host and a disposable treatment head. A venturi negative pressure generating unit and a flushing fluid power unit are integrated in the handheld host. The disposable treatment head comprises a multi-section flexible connection structure capable of self-adapting to bending of the catheter, a miniature ultrasonic suppository breaking unit capable of achieving cross interference focusing based on a single crystal wafer and a reflection cavity, and a multi-layer coaxial cavity structure capable of achieving synchronous suction and flushing. When the device works, ultrasonic energy directly acts on thrombus in a catheter to efficiently crush the thrombus, meanwhile, fragments are removed in time through negative pressure generated by the Venturi effect, and visual state indication is provided through the mechanical feedback unit. The problems that a traditional method is low in efficiency, complex in operation and asynchronous in fragment removal are solved, and safe, efficient and convenient integrated catheter thrombus removal is achieved.

The application discloses a coaxial cavity electrically tunable filter and belongs to the technical field of wireless communication. The coaxial cavity electrically tunable filter comprises an input-output coupling structure, a transmission structure, a frequency compensation device and a coupling compensation device; a cavity mainly comprises resonant cavities and a coupling structure; the resonant cavities are arranged in a linear array mode, and adjacent resonant cavities are communicated through the coupling structure; the top of each resonant cavity is provided with a choke structure, and the bottom of each resonant cavity is provided with a frequency compensation hole; the outer wall of the resonant cavities at the two ends of the linear array is provided with an input-output structure; the input-output coupling structure mainly comprises a coupling plate, a coupling ring and a radio frequency plug; the coupling ring is arranged on one side of the coupling plate, and the radio frequency plug is arranged on the other side of the coupling plate; and the coupling ring is located in the input-output structure. The frequency tuning column of the application reduces frictional resistance in the frequency adjustment process and improves the reliability of the electrically tunable filter.

The application belongs to the technical field of filters, and discloses a miniaturized double-coaxial cavity filter, a control method and application, which comprises a metal cavity, a cover plate, supporting medium, a slot-shaped resonant column, a feeder and two SMA-K type joints; the metal cavity is composed of three miniaturized single resonant cavities in cascade, the single resonant cavity is composed of one cavity and two slot-shaped resonant columns with different sizes, the two slot-shaped resonant columns are nested and multiplexed, the wall thickness of the slot-shaped resonant column in the resonant cavity at both ends is 0.6 mm, the wall thickness of the slot-shaped resonant column inside and outside the middle resonant cavity is 1.7 mm, and a three-order miniaturized coaxial filter symmetrical to the middle cavity is formed. The application is provided with a single-column slot structure facilitating multiplexing of multiple resonant columns, multiple resonant columns are loaded by a single cavity, the space structure is more compact, and the cavity utilization rate is improved. The application solves the problem of miniaturization of the all-metal cavity, and the single-cavity miniaturization mode can be used for other transmission line structures.

The present application relates to the technical field of coal dust concentration measurement, and particularly relates to a coal dust particle flow concentration measurement method and device. The measurement method comprises the following steps: arranging the coal dust particle flow concentration measurement device on a fluid pipeline to be measured; feeding a feed ring antenna on the side of a coaxial cavity with a microwave signal to generate resonance in the coaxial cavity; under the action of an inner wave column and an opening at the lower end of the coaxial cavity, part of the electromagnetic field in the coaxial cavity is scattered into the fluid pipeline of the coal dust particles through the stray cavity; the coal dust fluid produces disturbance to the electromagnetic field and changes the resonance frequency when passing through the electromagnetic field scattered into the fluid pipeline; the disturbed microwave signal is received by another feed ring antenna on the side of the coaxial cavity, and the resonance frequency offset before and after the disturbance is determined through a signal processing circuit; based on a previously fitted relationship between the resonance frequency offset and the coal dust concentration, the coal dust concentration is determined according to the resonance frequency offset, and the measurement accuracy is effectively improved.

The application discloses a coaxial cavity resonator and an electrically tunable band-pass filter, and belongs to the technical field of microwave filters. The coaxial cavity resonator comprises an outer cavity, an inner conductor, a tuning rod and a dielectric support. The inner conductor comprises a fixed part and a sliding part. The fixed part is fixed at the central position of the outer cavity through the dielectric support. The sliding part of the inner conductor is in good elastic conductive contact with the fixed part through a spring leaf. The sliding part of the inner conductor can linearly reciprocate inside the fixed part of the inner conductor. The transmission part of the inner conductor is fixed with the tuning rod through a thread. The tuning rod is a non-metal solid cylinder. The electrically tunable band-pass filter is composed of multiple coaxial cavity resonators, input and output structures and a coupling structure between the electrically tunable resonators. The electrically tunable band-pass filter has a wide tuning stroke, an unchanged absolute bandwidth and strong anti-interference capability.

The utility model discloses a structure for solving synchronous tuning of a coaxial mechanically tuned filter, which belongs to the technical field of microwave filters and comprises five parallel coaxial cavities, tuning rods in the coaxial cavities, double-coupling hole structures between adjacent cavities and input and output structures. The cavity bodies of the five parallel-row coaxial cavities are the same in size and are symmetrically distributed, the number of the cavity bodies can be N, and the coaxial cavity bodies can be arranged in a parallel-row mode or other flexible modes. The tuning rods in the coaxial cavity are symmetrically distributed, the diameters of the tuning rods are different, the middle of the tuning rods is thick, and the two sides of the tuning rods are thin. The double-coupling junction hole structure between the adjacent cavities is formed by forming two regular coupling holes in the common wall of the adjacent cavities, and the coupling between the whole cavities is symmetrically distributed. By changing the diameter of the resonance rod in the coaxial cavity, the problem of asynchronous high-frequency mechanical tuning is solved, and meanwhile, the bandwidth difference in the whole tuning range can be reduced by adopting the double coupling holes.

A remote sensing satellite data transmission subsystem based on multi-stage noise suppression comprises a data transmission integrated intelligent terminal, a multi-stage high-suppression-performance channel filter, an adjustable suppression degree phased array antenna, power supply and control equipment; the signal output by the data transmission integrated intelligent terminal is transmitted through the adjustable suppression degree phased array antenna after being filtered by the multi-stage high-suppression-performance channel filter; the power supply and control equipment is used for power supply and data transmission with the data transmission integrated intelligent terminal and the adjustable suppression degree phased array antenna respectively; the multi-stage high-suppression-performance channel filter suppresses the sensitive frequency band of the data transmission subsystem through its own multi-stage coaxial cavity and tuning screw; the adjustable suppression degree phased array antenna suppresses the sensitive frequency band of the data transmission subsystem by setting resonators in its own filtering module.

An electromagnetic power source (100, Fig. 1), e.g. a cylindrical or co-axial cavity gyrotron, surface wave source, klystron or travelling wave tube, configured to generate microwave or terahertz power modes for heating plasma in a nuclear fusion reactor (300, Fig. 6) is described. The power source comprises an excitation cavity 108 configured to generate an electromagnetic power mode 112, wherein the excitation cavity comprises a first, inner layer 122 thermally coupled to a second, outer layer 124, wherein the first layer comprises electrically conducting metal, e.g. copper, silver or gold, and the second layer comprises diamond. The diamond of the second layer may be a metal composite diamond or may be formed by chemical vapour deposition (CVD). The second layer may, for example, comprise: a unitary structure; a plurality of coaxially stacked, hollow cylindrical or toroidal segments (130, Fig 8a); or a plurality of rectangular bars joined using a brazing or bonding material (123, Fig. 4).

The present invention provides a hybrid-mode filter, which includes a filter body, a cover plate, a metal resonance component, and a comb-shaped resonance component. The cover plate is covered on the filter body. The filter body includes a first accommodation cavity and a second accommodation cavity opened in the filter body. The metal resonance component is fixed in the first accommodation cavity. The metal resonance component, the cavity wall of the first accommodation cavity, and the cover plate enclose a metal coaxial cavity. The comb-shaped resonance component is fixed in the second accommodation cavity. The comb-shaped resonance component, the cavity wall of the second accommodation cavity, and the cover plate enclose a comb-line cavity. A coupling window is provided between the metal coaxial cavity and the comb-line cavity, and the metal coaxial cavity and the comb-line cavity are communicated through the coupling window. The hybrid-mode filter realizes the strong zero-point cavity with a metal coaxial cavity and the weak pole with a comb-line cavity, and combines them into a single filter, achieving a filter product with high integration, high performance, low cost, and high quality in a limited space.

The invention provides a charged particle bundling device for aerospace product radiation simulation and a manufacturing method. The charged particle bundling device comprises an axis closing cavity, a deflection magnet assembly and a magnetic field detection and control system. The axis combining cavity is of a three-way structure and comprises an electron beam pipeline and a proton beam pipeline; the deflection magnet assembly comprises side magnet yokes, magnet yokes and magnetic poles, the magnetic poles are connected with the inner sides of the upper magnet yoke and the lower magnet yoke respectively, and the three-way convergence part of the shaft combining cavity is located between the upper magnetic pole and the lower magnetic pole. The magnetic field detection and control system comprises an excitation coil, a Hall magnetic field detector, an excitation power supply and a display control device; the excitation coil is wound on the side magnet yoke and is connected with an excitation power supply; and the Hall magnetic field detector is positioned in the cavity between the upper magnetic pole and the lower magnetic pole and is connected with the out-of-cavity display control device through an electric connector. Through the three-way structure design of the axis closing cavity, the proton beam and the electron beam can be effectively subjected to axis closing, and the requirement that a sample irradiates two kinds of particle beams at the same time in a comprehensive radiation test is met.

The invention discloses a box type topology coaxial cavity filter based on a coupling branch knot dual-mode coaxial resonator. The box type topology coaxial cavity filter comprises a metal cavity, a cover plate, two metal resonance rods and a metal dual-mode resonance coupling branch knot, the metal cavity is in a cuboid geometrical shape, and the cover plate is located at the top of the metal cavity, so that the metal cavity becomes a closed space; the size of the filter cavity, the size of the resonance rod and the size of the coupling branch depends on specific frequency requirements; the metal dual-mode resonant coupling branch knot is composed of a plurality of branch knots which are completely in mirror symmetry left and right, each side branch knot comprises first to fifth branch knots, and the first branch knot is of a block-shaped structure, is a common basic supporting part of the symmetrical branch knots and is directly connected with the metal resonant cavity to form a short-circuit end; the second branch knot is an arc convex surface; the third branch is of a blocky structure; and the fifth branch knot is connected above the fourth branch knot, is of a regular block-shaped structure, is kept in an equal-width vertical direction, and is provided with a gap with the metal resonant cavity to form an open circuit end.

The invention provides a novel coaxial cavity power divider. The novel coaxial cavity power divider comprises an input coaxial connector, a metal cover plate, a metal ridge, a metal cavity and four output coaxial connectors, a rectangular groove is formed in the inner side of the metal cover plate, and a circular through hole is formed in the center; the interior of the metal cavity is partially hollowed out, two circular through holes are formed in the two side walls of the cavity respectively, and the circular through holes located in the same side are separated through a metal wall. The metal ridge comprises an input end and four output ends; the metal ridge is mounted in the metal cavity, and four output ends of the metal ridge are respectively positioned at the positions of the four circular through holes in the metal cavity; the inner side face of the metal cover plate faces the metal cavity and completes installation, and the input end of the metal ridge is located at the round through hole of the metal cover plate. The input coaxial connector is connected with the input end of the metal ridge through the circular through hole of the metal cover plate; and the four output coaxial connectors are respectively connected with four output ends of the metal ridge through the circular through holes of the metal cavity. According to the invention, miniaturization of the cavity power divider can be realized.

The invention relates to the technical field of pulverized coal concentration measurement, in particular to a pulverized coal particle flow concentration measurement method and device. The measuring method comprises the following steps: arranging the pulverized coal particle flow concentration measuring device on a fluid pipeline to be measured; enabling a feed loop antenna on the side surface of the coaxial cavity to access a microwave signal and feed the microwave signal into the coaxial cavity to generate resonance; under the action of an opening in the lower end of the coaxial cavity and the inner wave guide column, part of the electromagnetic field in the coaxial cavity is strayed into a fluid pipeline of pulverized coal particles through the stray cavity; the pulverized coal fluid disturbs the electromagnetic field and changes the resonant frequency when passing through the electromagnetic field strayed into the fluid pipeline; the disturbed microwave signal is received by another feed loop antenna on the side surface of the coaxial cavity, and resonant frequency offset before and after disturbance is determined through a signal processing circuit; the pulverized coal concentration is determined according to the resonant frequency offset based on the pre-fitted relational expression between the resonant frequency offset and the pulverized coal concentration, so that the measurement precision is effectively improved.

The invention discloses a compact X-waveband end-fed broadband mode conversion device, which comprises a waveguide cavity and a coaxial cavity which are made of metal materials and are fixedly connected through four hidden screws B uniformly distributed on the wide edge of the waveguide in the horizontal direction, a rectangular waveguide channel is arranged in the waveguide cavity and is used for outputting TEmode electromagnetic waves; the coaxial cavity is used for inputting TEM mode signals and realizing broadband impedance matching through an internal coupling structure. The size of the whole machine can be compressed to be within L1, the relative bandwidth larger than or equal to 35% is obtained within the frequency band of 8-12 GHz, the full-frequency-band voltage standing-wave ratio is smaller than or equal to 1.15, and the dual requirements of a solid-state transmitter for miniaturization and broadband matching are met.

A magnetic tuning method and device suitable for an electromagnetic hybrid coupling coaxial cavity filter, comprising: an electromagnetic hybrid coupling coaxial cavity filter composed of a metal resonant cavity, a cover plate, and a metal resonant rod; a gap is left between the upper end of the metal resonant rod and the metal resonant cavity, forming an open-circuit end; the lower end of the metal resonant rod is directly connected to the metal resonant cavity, forming a short-circuit end; a slot or hole is opened near the magnetic coupling dominant region of the electromagnetic hybrid coupling coaxial cavity filter, and a magnetic tuning device extends from the slot or hole position into the resonant cavity through a mechanical structure. The total coupling coefficient of the electromagnetic hybrid coupling coaxial cavity filter is determined by the ratio of the electric coupling coefficient to the magnetic coupling coefficient; adjusting the magnetic coupling coefficient can adjust the total coupling coefficient of the electromagnetic hybrid coupling coaxial cavity filter. The present invention enriches the tuning of the electromagnetic hybrid coupling coaxial cavity filter.

The application relates to a magnetic loading material test platform and a use method thereof, characterized in that the platform comprises a cold-state test platform and a hot-state test platform; the cold-state test platform comprises a cold-state measurement support, a supporting rotating disc, a measurement line and a network analyzer; the measurement line is used for forming a magnetic coupling loop around the to-be-measured magnetic loading material during measurement, and the network analyzer is used for measuring the cold-state performance of the to-be-measured magnetic loading material through the test line; the hot-state test platform comprises a coaxial cavity device, a cooling unit, an impedance transformer, an adjustable capacitor, a solid-state power source, an oscilloscope and a surface temperature test system; the application can obtain accurate cold-state test data and hot-state test data of the to-be-measured magnetic loading material, and can be widely applied in the test field.

The embodiment of the invention discloses a thin film feedback throttler, a throttling method and a related device. The thin film feedback throttler comprises a multi-layer box body, a first thin film, a second thin film and an annular throttling groove formed in the surface of the multi-layer box body. Wherein a coaxial cavity is formed in the multi-layer box body, the first thin film and the second thin film are sequentially arranged in the coaxial cavity in the axial direction, and the coaxial cavity is divided into at least three independent cavities; the annular throttling groove is communicated with the coaxial cavity to form a throttling structure, and the first thin film and the second thin film are matched with the throttling tables at the corresponding positions to form a thin film feedback structure. Therefore, the two thin film feedback throttlers are connected in series to realize the refinement of regulating and controlling the flow of the oil cavity, the sensitive regulation and control of the throttling flow by the simultaneous deformation of the double thin films when the external load changes are realized, meanwhile, the excessive deformation of the thin films is also avoided, and the throttling performance is effectively improved.

The invention discloses a structure for solving synchronous tuning of a coaxial mechanically tuned filter, which belongs to the technical field of microwave filters and comprises five coaxial cavities arranged in parallel, tuning rods in the coaxial cavities, double-coupling hole structures between adjacent cavities and input and output structures. The cavity bodies of the five row coaxial cavities are the same in size and are symmetrically distributed, the number of the cavity bodies can be N, and the coaxial cavity bodies can be arranged in a row, side by side or other flexible forms. The tuning rods in the coaxial cavity are symmetrically distributed, the diameters of the tuning rods are different, the middle of the tuning rods is thick, and the two sides of the tuning rods are thin. The double-coupling junction hole structure between the adjacent cavities is formed by forming two regular coupling holes in the common wall of the adjacent cavities, and the coupling between the whole cavities is symmetrically distributed. By changing the diameter of the resonance rod in the coaxial cavity, the problem of asynchronous high-frequency mechanical tuning is solved, and meanwhile, the bandwidth difference in the whole tuning range can be reduced by adopting the double coupling holes.

This invention relates to a power combiner that converts a suspended band to a coaxial cable and then to a waveguide, comprising a housing, a copper strip conductor, and a copper rod conductor. The housing contains a copper strip cavity, a coaxial cavity, and a waveguide cavity. The copper strip conductor is suspended within the copper strip cavity by insulating support pillars and has at least two input copper strip sections, each radially distributed at a 360° / X-degree angle. The copper rod conductor includes an upper and lower section with different diameters. The upper end of the upper section extends into the waveguide cavity, and the lower section is connected to the copper strip conductor, with its lower end connected to the bottom of the housing for grounding. The diameter difference between the upper and lower sections achieves the transformation from low impedance to the impedance required for the waveguide. This invention achieves an orderly connection of three transmission modes—suspended band, coaxial, and waveguide—within the same housing, and each section is adapted to the power level it carries. The grounding heat conduction path of the lower section of the copper rod, after a quarter-wavelength transformation, exhibits high impedance, does not interfere with signal transmission, and solves the problem of heat accumulation under high power without the need for additional heat dissipation structures.

The invention discloses a miniaturized coaxial cavity filter. The miniaturized coaxial cavity filter comprises a cavity, a cover plate, a resonator, a tuning assembly and an input / output connector, a mounting opening is formed in the top of the cavity; the cover plate is arranged at the mounting opening, and a plurality of bosses are integrally stretched and formed on the inner side wall of the cover plate; the resonator is welded on the boss; the tuning assembly is arranged at the bottom of the cavity and is opposite to the resonator; the input and output connector is arranged on the cavity and is connected with the resonator; through the above structure, the profile height of the cavity filter can be reduced, the resonator is prevented from displacement, deformation or loosening at a high temperature, the stability of the cavity filter is improved, the application range of the cavity filter is widened, and the use requirements are met.

The invention discloses a steel bar head upsetting machine with independent clamping and forming die holders, and aims to solve the problems of low upsetting precision, quick die wear and the like caused by mutual influence of a clamping die and a forming die in the prior art. The equipment comprises a rack, a half clamping die, a half forming die and a die assembly driving seat, wherein the half clamping die and the half forming die are oppositely opened. The clamping die and the forming die can be transversely opened and closed on the rack, and a coaxial cavity is formed during die closing. A clamping die driving block and a forming die driving block are arranged on the die assembly driving seat and are respectively matched with die assembly driving surfaces of the clamping die and the forming die to realize independent clamping and forming actions; through displacement compensation of the forming die driving block and the forming die clamping driving surface, the influence of the clamping force change of the clamping die on the die clamping force of the forming die is eliminated. According to the structural design, the upsetting precision and quality are improved, the adaptability of equipment to steel bars of different specifications is enhanced, mold abrasion is reduced, the operation process is simplified, and the production efficiency and operation safety are improved.

The invention discloses a coaxial cavity resonator based on a microstrip plane structure, and belongs to the technical field of communication. The dielectric substrate is provided with a plurality of outer metallized via holes, and the plurality of outer metallized via holes are arranged to form a surrounding structure; an inner metalized via hole is formed in the surrounding structure; the upper surface of the dielectric substrate is not provided with a metal conductor, and the lower surface is provided with a metal conductor. The planar design of the coaxial cavity resonator is realized, and the coaxial cavity resonator has the advantages of simple structure, convenience in processing and high quality factor.

The application belongs to the technical field of Raman spectrum analysis, and particularly relates to an optical flow Raman sensing chip based on a SERS substrate and a preparation method thereof. The optical flow Raman sensing chip comprises a first PDMS layer, a silicon-based optical waveguide layer and a second PDMS layer, wherein the silicon-based optical waveguide layer is arranged on the top surface of the first PDMS layer, the silicon-based optical waveguide layer has a top surface and two side surfaces, the second PDMS layer is arranged on the top surface and the side surfaces of the silicon-based optical waveguide layer, the surface of the side surface of the second PDMS layer facing the silicon-based optical waveguide layer is provided with a near-coaxial cavity, and the arc-shaped inner wall of the near-coaxial cavity is provided with a reflecting film. The target object solution is specifically combined with the SERS composite layer through the microfluidic channel, the SERS composite layer loaded with the target object generates Raman laser under the excitation of pump light, and the Raman laser is output after enhancement under the synergistic effect of the arc-shaped inner wall and the reflecting film. The application significantly improves the collection efficiency of the Raman signal through the multi-dimensional coupling enhancement effect of the cavity structure.

The application discloses a black quartz rotor cover plate positioning and carrying device and method, and belongs to the technical field of semiconductor equipment. The black quartz rotor cover plate positioning and carrying device comprises a cross-shaped support. First positioning components are arranged below each end of the support. The first positioning components are used for being inserted between the black quartz rotor cover plate and a chamber. Two or more second positioning components are arranged below the support. The second positioning components are used for being inserted into black quartz rotor cover plate positioning holes. Locking components are arranged at each end of the support. The locking components are used for cooperating with the first positioning components to clamp and release the black quartz rotor cover plate. The cross-shaped support, the first positioning components, the second positioning components and the locking components are cooperated to realize accurate positioning in the radial direction, the angular direction and the axial direction at one time, so that the cover plate is coaxial with the chamber, the airflow field and the temperature field of the chamber are uniform, and process repeatability and film uniformity are significantly improved.

The invention relates to the field of magnetic conductivity simulation calculation, in particular to a device for testing high and low temperature magnetic conductivity of an annular magnetic core. Comprising a simulation module which establishes a short-circuit coaxial cavity model through three-dimensional simulation software, puts a magnetic core with known magnetic conductivity into the established short-circuit coaxial cavity, obtains a port reflection coefficient of the short-circuit coaxial cavity model with the magnetic core, and verifies a calculation process of the magnetic conductivity; the magnetic conductivity acquisition module is used for embedding a magnetic core to be measured into the verified short-circuit coaxial cavity model and calculating the magnetic conductivity of the magnetic core to be measured; and the calculation module obtains a reflection coefficient of the port of the short-circuit coaxial cavity model embedded into the magnetic core to be measured, and solves a real part and an imaginary part of the magnetic conductivity of the magnetic core to be measured according to the reflection coefficient. According to the method, three-dimensional simulation software is applied, a short-circuit coaxial cavity model is constructed, the magnetic core with the known magnetic conductivity is adopted for verification, then the magnetic conductivity of the unknown magnetic core is calculated, and the calculation efficiency of the magnetic conductivity is improved. The method is suitable for obtaining the magnetic permeability of the magnetic core.

The invention relates to an aircraft, the aircraft comprises a first driving system and a volute, the first driving system comprises two driving motors which are coaxially arranged and two groups of wind wings which are arranged in a conjugate mode; coaxial cavities are respectively formed in the two driving motors; the two sets of wind wings are arranged in the circumferential directions of rotors of the two driving motors correspondingly. A duct is defined in the volute; and the first driving system is coaxially arranged in the duct. According to the invention, the utilization rate of the airspace can be improved, and the problem of airspace navigation congestion is solved.

The invention relates to an aircraft. The aircraft comprises a first driving system, a second driving system used for driving the aircraft to move horizontally and an operation system. The first driving system comprises two driving motors which are coaxially arranged and two groups of wind wings which are arranged in a conjugate manner; coaxial cavities are respectively formed in the two driving motors; the two sets of wind wings are arranged in the circumferential directions of rotors of the two driving motors correspondingly. The second driving system is arranged in the first driving system along the axial direction; the operation system defines a first loading bin arranged at the bottom end of the first driving system and a water spraying device; a first loading space for accommodating water is defined in the first loading bin; a nozzle of the water spraying device is arranged in the first loading bin and communicates with the first loading space. The stability of the aircraft during navigation can be improved.

The invention provides a system and a method for testing extremely narrow ferromagnetic resonance line width of a spherical sample based on a rectangular coaxial resonant cavity, and belongs to the technical field of microwave and millimeter wave testing. According to the test system, a rectangular coaxial resonant cavity is designed as a test core device, and an inner conductor and an outer conductor are in direct contact and are coaxial, so that the rectangular coaxial resonant cavity structure forms an approximately uniform magnetic field in an area for placing a sample, and the structure can avoid the situation of inaccurate test caused by anisotropy of the spherical sample; and the volume of the measurable spherical sample of the rectangular coaxial resonant cavity can be larger, so that the preparation and characterization difficulty of the sample is reduced, and the measurement accuracy is improved.