207results about How to "Change the resonant frequency" patented technology

The invention discloses a TM mode dielectric filter. The TM mode dielectric filter comprises a base and a covering plate, wherein at least two resonators are arranged in the base; frequency adjustment holes are formed in the resonators, and a resonator coupling device is arranged between every two adjacent resonators; the covering plate is provided with frequency adjustment screw rods corresponding to the frequency adjustment holes; the two resonators at the two ends in the base are respectively provided with an input and output coupling device. The TM mode dielectric filter is characterized in that resonators are cylindrical, and the resonators and the base are made of the same material and formed integrally; annular air grooves with upper ends open are formed circumferentially in the cylindrical surface of each resonator in the base; the base and the covering plate are made of TM mode dielectric material. The TM mode dielectric filter has the advantages of being simple in structure, free of introduction of elastic conductors, small in size, and better in filtering performance.

The invention discloses a reconfigurable substrate integrated waveguide bandpass filter and a reconfigurable method of the filter and mainly solves technical problems that the tuning range is small, the insertion loss of reconfigurable substrate integrated waveguide bandpass filters is high and control voltage of variable capacitance diodes cannot be directly applied to substrate integrated waveguides. One variable capacitance diode is placed in a non-metal via hole formed in the center of each of two complementary split-ring resonators of the bandpass filter, the metal part at an inner ring opening of each complementary split-ring resonator is replaced with a blocking capacitor, so that a substrate integrated waveguide is separated from an outer circuit, and a voltage source is prevented from being short-circuited; the variable capacitance diodes are connected with a direct-current bias circuit, reversed bias voltage at two ends of the variable capacitance diodes is adjusted, junction capacity of the variable capacitance diodes is changed, so that the resonant frequency of the two complementary split-ring resonators is affected, and the passband center frequency is reconfigurable. The feeding manner of the variable capacitance diodes in the substrate integrated waveguide is realized, the control manner is simple and easy to implement, the frequency tuning range is relatively large, the in-band insertion loss is low, and the filter can be applied to a wireless communication system.

The invention discloses an electromagnetic two-dimensional reconfigurable filter with an adjustable frequency bandwidth and belongs to the technical field of microwave and millimeter waves. Accordingto the reconfigurable filter, adjustable capacitors are loaded in a substrate integrated waveguide resonator to adjust the operating frequency of each cavity, the ferrite materials are loaded at thecoupling window of the substrate integrated waveguide filter to directly control the coupling strength between the substrate integrated waveguide resonators, the adjustable capacitance is loaded on the input-output feeder to adjust the external quality factor, then the frequency of the reconfigurable filter is adjusted and the bandwidth of the filter are flexibly controlled. Compared with the traditional single electrical reconfigurable substrate integrated waveguide filters, the filter realizes a flexible design of bandwidth, the waveform retention degree of the filter is greatly improved andthe future multi-band, miniaturization, intelligent wireless communication equipment and systems can be broadly applied in potential.

The invention discloses a wireless charging transmitting system and a wireless charging receiving system. The wireless charging transmitting system comprises a PFC circuit, an inversion circuit, a transmitting coil, an inductively compensated circuit connected in series between the inversion circuit and the transmitting coil, and a first capacitance compensation circuit in parallel connection with the transmitting coil, wherein the PFC circuit, the inversion circuit, the transmitting coil, the inductively compensated circuit and the first capacitance compensation circuit are sequentially connected with an AC power supply. The inductively compensated circuit is provided with an inductance adjustment device which is used for adjusting the size of an inductance value, and the first capacitance compensation circuit is provided with a first capacitance adjustment device which is used for adjusting the size of a capacitance value. According to the technical scheme of the invention, the system can adjust the output power of the wireless charging system.

A piezoelectric filter includes a plurality of piezoelectric resonator portions each having a substrate, an SiO2 layer, a piezoelectric thin-film, a lower electrode, and an upper electrode. The plurality of piezoelectric resonator portions include piezoelectric resonator portions having a relatively low frequency, and the lower electrodes of the piezoelectric resonator portions having a relatively low frequency have a thickness larger than that of lower electrodes of other piezoelectric resonator portions. A ladder-type piezoelectric filter, which is one of the communication devices, includes a plurality of parallel resonators and series resonators.

The invention provides a frequency-adjustable array type piezoelectric cantilever beam energy harvester with a compact structure and high energy efficiency. Through separately arranging a plurality of piezoelectric stacks on two opposite side surfaces of an aluminum alloy substrate in an array manner, frequency adjustment is realized through different frequency adjusting capabilities of the piezoelectric stacks. Furthermore resonant frequency of the energy harvester can be efficiently adjusted automatically according to the vibrating frequency of surrounding environment automatically. Simultaneously, the invention further provides a frequency-adjustable array type piezoelectric cantilever beam energy harvesting method for the piezoelectric energy harvester. Position information of the free end of the piezoelectric cantilever beam is detected through combination of a magnet and a Hall sensor, and is input to a control circuit. The control circuit calculates according to the position information for obtaining latest electric field boundary condition values of a plurality of piezoelectric stack arrays. Furthermore a control signal is transmitted to the plurality of piezoelectric stack arrays for updating the latest electric field boundary condition values.

The present invention provides a system for detecting a malodor and dispensing an air treatment when needed. In an exemplary embodiment of the present invention, the system includes a selection mechanism which allows the user to choose how the system dispenses the air treatment, a sensor, a timing control circuit coupled with the sensor, and a delivery system coupled with the timing control circuit. Upon detection of a malodor by the sensor, the sensor communicates with the timing control circuit which, in turn, communicates with the delivery system to dispense the air treatment. In another exemplary embodiment of the present invention, an air-freshening system is shown that combines a continuous dispensing system with a sensing dispensing system.

The invention discloses a fiber bragg grating transverse pressure transducer system based on a microwave photonic filter and a measuring method thereof. The system comprises a broadband light source, an electro-optic intensity modulator, an optical fiber coupler, a fiber bragg grating, an optical fiber polarization beam splitter, an adjustable optical fiber delay line, an adjustable optical fiber attenuator, a chromatic dispersion compensation optical fiber, a photoelectric detector and a vector network analyzer. When the fiber bragg grating is subjected to the effect of a transverse pressure, two beams of optical signals with different center wavelengths will be reflected because of a birefringence effect. The two beams of optical signals are respectively corresponding to different polarization directions. When the transverse pressure changes, a center wavelength difference of the two beams of reflected light will change so as to change the resonant frequency of a microwave photonic notching filter. A frequency response curve of the filter is measured by the vector network analyzer to obtain the resonance center frequency to realize measurement of the transverse pressure. The fiber bragg grating transverse pressure transducer system of the invention is advantaged by being high in resolution, adjustable in sensitivity and capable of realizing long distance transverse pressure measurement in an electromagnetic interference preventing mode.

The invention provides a clutch master cylinder mounting structure comprising a clutch master cylinder and a mounting pad. The middle of the clutch master cylinder is provided with a projecting edge; the peripheral surface of the clutch master cylinder is evenly provided with a plurality of bosses. The mounting pad is in the shape of a hollow tube; the inner wall of the mounting pad is peripherally and evenly provided with a plurality of grooves penetrating from one end of the mounting pad to the other end; the groove width of one end of each groove is enlarged to form a contact face parallel to the end face of the mounting pad; the mounting pad is provided with a connecting part connected with an automobile body. The bosses of the clutch master cylinder enter the grooves of the wall of the mounting pad; the projecting edge is abutted to one end of the mounting pad; the bosses match with the contact face. The clutch master cylinder mounting structure allows the clutch master cylinder to be convenient to demount, assemble and maintain.

The invention relates to an ultra-wideband monopole antenna with double-stop band characteristics, which comprises a dielectric substrate [1]; a metal grounding plate [2] is printed on one side of the dielectric substrate [1], and a radiation unit [3] and a feed unit [5] are printed on the other side of the dielectric substrate [1]; the antenna is characterized in that: a. the radiation unit [3] is in a regular hexagon shape, and two C-shaped grooves [4] are carved on lower positions of the circle center of the radiation unit [3], and the C-shaped grooves [4] are open rings; b. the radiation unit [3] is directly connected with the feed unit [5]; and c. the metal grounding plate [2] is a ladder-shaped metal patch. The ultra-wideband monopole antenna with double-stop band characteristics has good ultra-wideband and double-stop band characteristics, and can eliminate the mutual impact with other narrow-band wireless communication systems; the double-stop band frequency is adjustable and can satisfy the application of special occasions; and the antenna has the advantages of small size, light weight, low consumption and simple structure, is applicable to mobile miniature equipment, meets the plane design requirements, facilitates the integration with an active circuit, has low cost, high precision and good repeatability, and can be well designed conformably with equipment in the similar regular hexagon shape.

The invention discloses a broadband MIMO antenna based on four units, and mainly aims to solve the problem that the existing MIMO antenna features narrow band, large size and low channel capacity. Thebroadband MIMO antenna includes a dielectric substrate (2), a metal floor (3), and a feed port (4). A radiation layer (1) is arranged on the surface of the dielectric substrate. The radiation layer includes four identical radiation units (11) distributed symmetrically. Each radiation unit includes a feeder (111) and a monopole (112). Each monopole is composed of a fan-shaped metal patch (1121) and an 'L'-shaped metal patch (1122). Each fan-shaped metal patch is disposed outside the position right above the corresponding 'L'-shaped metal patch, and the center is on the extension line of the edge of the corresponding feeder. The upper end of each 'L'-shaped metal patch is connected with the lower end of the corresponding fan-shaped metal patch, and the lower end of each 'L'-shaped metal patch is connected with the upper end of the corresponding feeder. The broadband MIMO antenna is smaller, can work within the band between 2.68GHz and 4.55GHz, and can be used in mobile communication.

The invention provides an antenna device with excellent penetrating performance. The antenna device includes a first radiator, a second radiator, a third radiator, and a dielectric substrate. The slotof the first radiator is configured to adjust the antenna impedance to achieve an effect of adjusting the resonance frequency. The dielectric substrate with a corresponding dielectric constant is arranged between the first radiator and the second radiator as required. The third radiator is used as a reflection plate, is located below the second radiator and increases the gain in the direction of0-degree angle. A low-dielectric-constant medium with a certain thickness is disposed directly above the first radiator. A feeding point is disposed on the first radiator. The second radiator is grounded. The antenna device has excellent penetrating performance, and can still smoothly transmit energy to the outside when buried in reinforced concrete.

The invention provides a reconfigurable ultra-wideband monopole antenna with a notch characteristic. The reconfigurable ultra-wideband monopole antenna comprises a radiating element, a microstrip feeder, a dielectric substrate and an earth plate, wherein the radiating element and the microstrip feeder are arranged on the upper surface of the dielectric substrate, and the earth plate is arranged on the lower surface of the dielectric substrate; the radiating element comprises an isosceles trapezoid area and a rectangular area of which the width is equal to the lower bottom of the isosceles trapezoid area and which is connected to the isosceles trapezoid area, and the rectangular area is provided with an arc gap of which the opening faces the lower bottom of the isosceles trapezoid area; the arc gap is provided with multiple radio frequency switches; the upper bottom of the isosceles trapezoid area of the radiating element is connected to the microstrip feeder. The reconfigurable ultra-wideband monopole antenna with the notch characteristic not only has complete UWB performance, but also achieves antenna miniaturization while achieving notch reconfigurability as required.

The invention discloses a double-layer coupling type Fano resonance sensor based on graphene and belongs to sensing devices in the technical field of infrared, and the surface plasma characteristics of the graphene are utilized; the sensing device is in a three-dimensional periodic structure and structurally comprises a silicon substrate layer, a silicon dioxide substrate layer, a graphene disk middle layer, a silicon dioxide isolation layer and a graphene disk top layer; the transmittance spectrum of the double-layer coupling type Fano resonance sensor based on the graphene in the middle-infrared band is computed and simulated with a finite element method, the sensor structure is optimized, high-performance Fano resonance can be stimulated in the middle-infrared band, the resonance curveis sensitive to the change of substance refractive indexes, and the detection functions on gas and liquid in the middle-infrared band are provided. The double-layer coupling type Fano resonance sensorbased on the graphene is simple, compact and reasonable in structure and convenient to process.

The invention discloses a bi-waveband high-wave-transmittance metasurface which comprises structural units arranged in an array, wherein each structural unit comprises two opposite dielectric substrates, and a metal folding line between the two dielectric substrates. The metal folding line is etched in the middle of the dielectric substrates. The large-angle high-wave-transmittance metasurface has the advantages of simple structure, easy processing, high transmissibility in large incident angle, and bi-waveband transmission property. When the incident angle is large, the bi-waveband high-wave-transmittance metasurface realizes high transmission between two wavebands of Ku and Ka, and has total reflection characteristic in the X wave band. Combination of two functions is realized.

The embodiment of the invention provides an indium antimonide thin film terahertz metasurface and a thermal tuning method and preparation method thereof. The terahertz metasurface is arranged to be ofa three-layer structure comprising a rectangular substrate layer, a column array structure layer and an indium antimonide thin film so that the dielectric constant of the indium antimonide thin filmcan be changed along with temperature change, and the resonance frequency of the terahertz metasurface is changed. Therefore, the terahertz metasurface can change the resonance frequency by changing the temperature, and meanwhile, the tuning range of the terahertz wave resonance frequency is enlarged. The terahertz metasurface is simple in preparation method and suitable for being widely applied to the field of photoelectric manufacturing, so that the application range of the terahertz metasurface is widened.

A surface-mount antenna, in which a radiation electrode to be connected to a radio-communication high-frequency circuit to operate as an antenna is formed on a base member 2. One end of the radiation electrode serves as a feeding portion for being connected to the radio-communication high-frequency circuit, and the other end of the radiation electrode is an open end. The radiation electrode includes a portion whose width is increased as it goes from the feeding portion toward the open end. The base member includes a band-like feeding electrode connected to the feeding portion of the radiation electrode to serve to connect the feeding portion to the high frequency circuit, and a ground electrode disposed on one side or both sides of the feeding electrode with a defined spacing between the feeding electrode and the ground electrode. The spacing between the ground electrode and the feeding electrode is set to be smaller than the width of the feeding electrode.

The invention belongs to the field of acoustic metamaterials, and discloses a frequency-adjustable local resonance structure unit for constructing acoustic metamaterials. The structure unit comprisesa vibrator quality structure 1, a vibrator rigidity structure 2, a supporting structure 3 and an adjusting device 4, the adjusting device 4 is arranged on the vibrator rigidity structure 2, the vibrator quality structure 1 is mounted on the vibrator rigidity structure 2, a mounting position of the vibrator quality structure 1 on the vibrator rigidity structure 2 can be flexibly adjusted along theadjusting device 4, and the supporting structure 3 is connected with the vibrator rigidity structure 2. According to the structure unit, the position of the vibrator quality structure 1 on the vibrator rigidity structure 2 is adjusted along the adjusting device 4 without changing a structure and material parameters, the resonance frequency of the local resonance unit is flexibly adjusted, the structure unit overcomes the shortcoming that resonance frequency of a traditional artificial acoustics microstructure unit is difficultly adjusted, and the structure unit is simple in structure.

The invention relates to an air filter used for an automatic tumbrel, which is used for connecting an inlet conduit preset by an engine. The air filter comprises an inlet side shell, an outlet side shell, a filter and an air suction pipe, wherein the inlet side shell is provided with an air inlet for air entering; the outlet side shell is in abutting joint with the inlet side shell; one side of the outlet side shell is provided with an air outlet for the inlet conduit passing through; the filter is arranged between the inlet side shell and the outlet side shell; the air suction pipe is arranged in the outlet side shell; one end of the air suction pipe is connected with the inlet conduit, while the other end of the air suction pipe is provided with an open end; and a plurality of through holes are penetrated on the surface of the air suction pipe. Noise volume can be reduced through the components effectively.

The invention relates to a damping tool holder suitable for deep hole boring. The vibration-damping cutter bar includes an outer jacket and an inner sleeve. A tool seat and a nozzle connected to the coolant pipeline are arranged on the top of the cutter bar. An O-ring and an O-ring are arranged between the outer jacket and the inner sleeve. The vibration-damping layer formed by the flat washer 1 is connected with the adjustment nut 1 at the end of the vibration-damping layer formed by the O-ring 1 and the flat washer 1, and the adjustment nut 1 is placed in the jacket, which is a regular octagonal structure, at the end of the tool bar. The end is equipped with a counterweight, and the tool holder can be replaced with an extended tool holder. The vibration-damping tool rod of the present invention effectively solves the problem of the resonance of the tool rod, and the resonance frequency can be changed by adjusting the deformation of the vibration-damping layer by adjusting the nut, thereby reducing the resonance and improving the dimensional accuracy and surface quality of the product; the regular octagon of the jacket The structure greatly improves the rigidity of the tool holder. The invention adopts ordinary materials, has simple structure and low price, and can fully meet the complex damping requirements.

The invention discloses a plasma-induced transparent metamaterial sensor, which belongs to a sensing device of a graphene material in an intermediate infrared band, and utilizes graphene surface plasma characteristics and a plasma-induced transparency theory. The sensing device is of a three-dimensional periodic structure and is of a three-layer structure composed of a top layer, a middle layer and a bottom layer which are stacked from top to bottom, wherein the top layer is of a graphene split-ring resonator and graphene double-nanobelt structure, the middle layer is a silicon dioxide medium,and the bottom layer is a doped silicon substrate layer. The resonance spectrum of the plasma-induced transparent metamaterial sensor is calculated and simulated mainly through a finite element method, the structure of the sensor is optimized, the capability of exciting plasma-induced transparent resonance in a middle-infrared frequency band is achieved, and the linearity and resonance frequencyof the plasma-induced transparent resonance can be effectively tuned. The sensor is simple, compact and reasonable in structure and convenient to machine.

The invention relates to the technical field of combustion gas turbines, and discloses a frequency modulation device for a combustion gas turbine flame tube. The frequency modulation device includes a device body which is provided with a cavity, wherein the bottom of the cavity is provided with an opening for air circulation, an elastic element and a baffle positioned below the elastic element are arranged in the cavity, one end of the elastic element is connected with the top wall of the cavity while the other end of the elastic element is connected with the baffle, and a gap is reserved between the side of the baffle and the side wall of the cavity; the invention also provides a combustion gas turbine flame tube, including a flame tube wall on which a plurality of frequency modulation devices for the combustion gas turbine flame tube according to the above technical scheme is arranged, wherein the cavities of the frequency modulation devices communicate with the flame tube wall to facilitate the circulation of combustion gas flow. The frequency modulation device for the combustion gas turbine flame tube can achieve stepless regulation on resonant frequency in the frequency modulation device, to automatically damp or inhibit thermo-acoustic vibration within a specific frequency band in the flame tube.

The invention discloses a high-temperature superconductive bandwidth-adjustable filter. The high-temperature superconductive bandwidth-adjustable filter comprises variable capacitors, a high-temperature superconductive substrate and resonators arranged on the high-temperature superconductive substrate. The high-temperature superconductive bandwidth-adjustable filter is characterized in that a microstrip line with the length of 1 is arranged at any position between two adjacent resonators; mutual coupling is led to the two resonators by means of an interdigitated capacitor; one variable capacitor is loaded to the middle part of the microstrip line connecting the adjacent resonators; and a coupling coefficient formed based on the two adjacent resonators is variable. According to the invention, by the control of a program-controlled power supply, the coupling coefficient between adjacent resonators is changed, and the resonant frequency of each resonator is changed by changing the variable capacitors loaded to the resonators, so that the frequency adjustment and the bandwidth adjustment of the filter are realized, and the reconstruction of the filter is realized in the tuning process.

The invention discloses a vibration energy recovery device having function of self-adaptive control on ultrasound piezoelectric actuation. The vibration energy recovery device comprises a vibration energy recovery device and an ultrasound vibration driver, wherein the vibration energy recovery device comprises a cantilever beam, a dovetail groove guide rail and a cantilever beam support sliding block, a sliding block at the bottom end of the cantilever beam support sliding block is arranged in the dovetail groove guide rail, the tail end of the cantilever beam is fixed, the front end of the cantilever beam passes through a cantilever beam guide support groove at the upper end of the cantilever beam support sliding block, and the ultrasound vibration driver adopts an improved Langevin vibrator structure, and is arranged on the a driver support and used for adjusting a friction driving block to be in contact with the side wall of the cantilever beam support sliding block. By the device provided by the invention, resonant frequency of a single vibration pick-up structure can be changed, so that the device can be applicable for different environmental vibration frequencies, the vibration energy recovery device can recover broadband vibration energy by the single vibration pick-up structure, and energy recovery power per unit volume is improved.