164 results about "Faraday cage" patented technology

The utility model provides a wireless vibration sensor for power transmission tower bolt looseness detection. The wireless vibration sensor comprises a shell, a piezoelectric sensitive base, a signal acquisition circuit board, a wireless transmission module, a battery and a Faraday cage type shielding cover. The piezoelectric sensitive base is connected to the bottom position of the shell, a piezoelectric material is installed in the piezoelectric sensitive base, a fixing plate is arranged in the piezoelectric sensitive base, and the signal acquisition circuit board is arranged on the upper surface of the fixing plate; the wireless transmission modules are arranged above the signal acquisition circuit board at intervals through a support and located in the shell, the support is vertically arranged on the upper surface of the fixing plate, and the wireless transmission modules are detachably arranged on the support and electrically connected with the signal acquisition circuit board through conductive spring contact pieces. And the Faraday cage type shielding case is arranged around the wireless transmission module and is grounded, and the Faraday cage type shielding case is made of a conductive metal net. According to the invention, the working stability of the sensor in a high electromagnetic interference environment is improved, so that the reliability of data transmission can be ensured.

A superconducting quantum processor unit for quantum computing is provided. The processor unit is formed from the union of a qubit chip and a wiring chip with superconducting bonding bumps and spacers. The bumps may be densely distributed around active elements between the two chips and effectively form a Faraday-Cage around the qubits, control signal waveguides etc. The qubit chip has strategically spaced qubits and an inductively coupled probe line and the wiring chip has a bus coupling resonator with a number of voltage nodes and anti-nodes, a resonator pump and at least one SQUID. Magnetic flux applied through the SQUIDs changes their impedances and modifies the microwave boundary conditions of the bus. This allows in-situ shifting of electric field distributions of the resonance modes of the bus along the length of the bus. This tunes the coupling rates of the bus to all qubits simultaneously.

The invention relates to an electrochemical sensor for monitoring beta cell insulin secretion in real time and a preparation method and application thereof, the sensor is an electrochemical chip modified by a multi-dimensional nano material, and the multi-dimensional nano material on the electrochemical chip is used for capturing dopamine released by beta cells; and determining the release quantity of dopamine according to the electrochemical signal. According to the method, the insulin secretion condition of the beta cells is monitored in real time by taking dopamine as a tracer agent, and the exocytosis process of the beta cells can be researched under natural and normal conditions. According to the invention, only a common Faraday cage and a basic electrochemical workstation are needed for detection, one or more beta cells can be detected, the operation is simple, and the research efficiency of insulin secretion is greatly improved. In addition, the medicine for regulating beta cell insulin secretion can be efficiently screened, and a foundation is laid for research of diabetes treatment medicine.

An enclosure to protect people and instruments from the effects of an electromagnetic pulse (EMP) is provided. The enclosure includes a floor assembly; walls extending upward on a first, second, third, and fourth side of the floor assembly; a roof; and a ceiling. On the interior of the enclosure, a shield layer is provided such that the enclosure forms a six-sided Faraday cage. Fasteners and other conductive securement materials such as copper tape help achieve the conductivity of the shield layer. Extending through the walls of the enclosure may be secure points of entry allowing for people, air, and conductors to securely enter and exit the enclosure. The enclosure contains a grounding system to assist with protecting the contents of the enclosure from the effects of the EMP.

The invention discloses a high-voltage electric pulse cracking coal rock stress shock wave monitoring device which comprises a high-voltage pulse capacitor, a voltage divider, a high-voltage pulse switch, a high-voltage pulse cracking generation chamber, a high-voltage probe, a Rogowski coil and an oscilloscope. A test piece is fixed in the high-pressure pulse cracking generation chamber, a circle of test piece clamping assembly corresponding to the test piece is arranged in the high-pressure pulse cracking generation chamber, needle-shaped electrodes are arranged on the two sides, not provided with the test piece clamping assembly, of the test piece, and a piezoelectric pressure sensor is arranged on the high-pressure pulse cracking generation chamber. The detection signal output ends of all the piezoelectric pressure sensors are connected with the pressure detection signal input end of the stress wave signal collector, and a Faraday cage used for covering the piezoelectric pressure sensors is arranged in the high-pressure pulse fracturing generation chamber. The propagation characteristics of the high-voltage electric pulse stress shock waves in the coal rock mass can be accurately and directly captured in real time, and accurate and reliable data support is provided for deep research on a high-voltage pulse electric crushing mechanism.

The invention relates to the technical field of PVB heat-insulating films, in particular to a PVB heat-insulating film based on indium tin oxide and bronze cesium tungsten compounding and a preparation method thereof.The PVB heat-insulating film is prepared from, by weight, 80-120 parts of PVB resin, 20-50 parts of oily plasticizer, 0.1-2.0 parts of silane coupling agent, 0.1-1.0 part of antioxidant, 0.1-1.0 part of ultraviolet light absorber, 1-5 parts of polyethylene glycol derivative and 1-5 parts of compound dispersion slurry, the weight ratio of the indium tin oxide powder to the bronze cesium tungsten powder in the compound dispersed slurry is (5: 5)-(7: 3). According to the PVB heat-insulating film based on indium tin oxide and cesium tungsten bronze compounding and the preparation method, the prepared PVB heat-insulating film has high visible light transmittance and excellent near-infrared light rejection rate, meanwhile, the Faraday cage effect can be effectively avoided, and the signal shielding problem is avoided.

The invention relates to a cover plate device, belongs to the technical field of constructional engineering, and particularly relates to a cover plate device of a Faraday cage reserved joint and a construction method thereof, the cover plate device comprises a joint cover plate, one side of the joint cover plate is in contact with a concrete surface, and the cover plate device further comprises a plurality of wood nail holes formed in the side edge of the joint cover plate in a penetrating manner; a clamping hole matched with a Faraday cage steel bar is formed in the connector cover plate in a penetrating mode. One side of the joint cover plate is saw-toothed; according to the method, the flow of the reserved joint of the Faraday cage is simplified, the accuracy of the reserved joint can be ensured, the construction speed can be increased, meanwhile, subsequent wall Faraday cage connection is facilitated, the reserved construction efficiency and the reserved quality of the Faraday cage can be greatly improved, and the problems that an existing mode of welding the reserved joint through template drilling is low in construction efficiency and low in construction cost are solved. The joint positioning is not accurate; and the subsequent Faraday cage connection is not convenient.

The invention belongs to the technical field of electromagnetic radiation leakage, and particularly relates to a low-leakage handheld terminal. According to the method, efficient electromagnetic shielding is achieved in a Faraday cage structure mode through lap joint of all parts, the surface of a resistance screen is covered with an irregular metal net, and the space between the irregular metal net and a front cover is filled with an aluminum silver-plated conductive rubber plate used for cushioning and extrusion to achieve electric continuity between the irregular metal net and the front cover. The front cover, the middle frame and the rear cover are electrically continuous through opposite-penetrating screws, and copper foils are filled among contact surfaces of the middle frame, the rear cover and the front cover to enhance conductivity, so that the whole handheld terminal structure is in an electrically continuous state. The broadband electromagnetic shielding material has the beneficial effects that the electromagnetic shielding performance is remarkably improved, broadband effective protection is realized, the problem that the frequency band of a traditional electromagnetic shielding material is narrow is effectively solved, the shielding effectiveness of 40-50dB is realized in the broadband range of 30MHz to 1GHz, and the information safety level of equipment in an electromagnetic sensitive environment is remarkably improved.

The utility model discloses a kind of inert gas monitoring devices for subway strong magnetic environment belongs to strong magnetic environment gas monitoring device technical field.The inert gas monitoring device includes control module, control module is provided with sensor;Shell, control module is installed in shell, the outer periphery of shell is covered with plating layer, plating layer is metal plating layer, make shell form faraday cage, faraday cage is hollow structure.The inert gas monitoring device is set by metal plating layer in the outer periphery of shell, make shell form faraday cage, to be able to shield induced electromagnetic field in machine room, guarantee sensor and control module can normally operate, so that the inert gas monitoring device can accurately collect the concentration of inert gas.When the concentration of inert gas is monitored to reach certain condition, control center will issue early warning, prevent staff from entering machine room under the condition that inert gas concentration is relatively high, avoid the health of staff is affected.

The invention discloses a gas-solid triboelectrification test method and device for a moving object, and relates to the technical field of triboelectrification measurement, and the method comprises the following steps: constructing a sample ball and gas triboelectrification model in a free falling process of a sample ball in a glove box with a built-in Faraday cage based on a Maxwell velocity distribution rule; carrying out standardized pretreatment on the sample small balls to remove residual charges on the surfaces of the sample small balls; performing air replacement in the glove box with the built-in Faraday cage until the internal air pressure and environmental parameters meet the test requirements, and determining the diameter range and the falling height of the sample small ball; filtering the electrostatic charge signal, reading the electrostatic charge quantity of the small sample ball at different falling heights, and determining the charge quantity increased by the small sample ball in the free falling process of the glove box with the built-in Faraday cage; the gas-solid friction electrification quantity of the moving object under the influence of the object moving speed, the effective friction area and the environment air pressure factor is measured in a non-contact mode.

A disaster relief device is provided that integrates power generation, water purification, and communications into a single portable housing. The device includes a water treatment system having reusable pre-filters, multi-stage sediment filters, a reverse osmosis unit, and a UV sterilizer, together with a clean water storage tank mounted on a drawer for field servicing. An electrical subsystem incorporates a lithium iron phosphate battery pack in a fire-resistant enclosure, a charge controller, and a pure sine wave inverter. A hybrid solar array, including hinged and slide-out panels, provides rapid renewable power deployment, with guided cable carriers ensuring reliability. The housing is sealed to an IP66 rating, reinforced to function as a Faraday cage, and configured for transport with folding handles and airless wheels. Optional features include an integrated rainwater harvesting system, modular interconnection of multiple units for scaling capacity, and a satellite communications bracket for emergency connectivity.

Systems and methods for component isolation are disclosed. In one aspect, one or more ferromagnetic walls may be positioned between components such as for example, filters (acoustic or otherwise), surface-mounted devices (SMDs), amplifiers, switches, or the like. The ferromagnetic walls may be introduced as part of an overmold package and may be thinner than conventional Faraday cages or shields, allowing components to be placed in closer proximity without increasing crosstalk or electromagnetic interference (EMI).

This invention discloses an iterative tuning operating point static calibration method, electronic device, and storage medium, belonging to the field of static calibration technology. The iterative tuning operating point static calibration method includes placing an optical electric field sensor and calibration equipment within a Faraday cage; using an AC source connected to a high-voltage transformer to generate a power frequency electric field of known intensity through a pair of parallel electrode plates, with the optical electric field sensor positioned between the two plates; emitting polarized light to the waveguide of the optical electric field sensor and loading the electric field signal to be measured onto the light wave; converting the electric field signal into an analog electrical signal through a photoelectric conversion circuit; and demodulating and calculating the measured electric field value through a digital signal processing circuit. Static operating point calibration is performed in a power frequency electric field environment, and the linear operating point of the sensor is controlled using laser wavelength tuning and an iterative method, improving the stability and accuracy of the optical electric field sensor in a high-voltage electric field environment.

This invention discloses a double-layer bend-resistant flexible circuit board and its processing method, comprising: a core layer, wherein circuit layers are laid on both the upper and lower surfaces of the core layer. This invention has the following beneficial effects: functional layering and electromagnetic shielding are achieved through conductive patterns on the two circuit layers. The conductive patterns on the top circuit layer are arranged in a ring, serving as a complete grounding / shielding layer. Together with the four rings of conductive patterns at the bottom, they form an upper shielding and lower signal architecture, providing a stable reference plane and Faraday cage shielding for internal high-speed signals. This greatly suppresses signal crosstalk and external electromagnetic interference. Furthermore, through stress holes and protrusions, the openings form a controllable low-stiffness zone on the bending axis, actively guiding the uniform release of bending stress at this point. This protects fragile vias and delicate conductive pattern traces from fatigue fracture. Moreover, the protrusions wrapping around the conductive patterns can generate additional deformation space and buffer, dispersing the stress acting on the conductive patterns.

The application relates to a Faraday cage type aptamer sensor based on a MOF nanofilm and a method for detecting Staphylococcus aureus. A 1,1'-ferrocene carboxylic acid is used as a ligand, zirconium / hafnium is used as a central atom, and a Zr-based MOF nanofilm with different hafnium doping ratios is synthesized by using a bottom-up method. A Zr / Hf-MOF nanofilm with large size and excellent conductivity is selected as a two-dimensional signal probe, and is used for constructing an aptamer sensor of a Faraday cage. When Staphylococcus aureus exists, the Zr / Hf-MOF nanofilm is attached to the surface of an electrode to form a Faraday cage sensing interface, the interface expands an outer Helmholtz plane layer, leads to direct electron transmission between the electrode and the signal probe, and thus Staphylococcus aureus can be detected through an electrochemical workstation. The detection method of the application can realize detection of a large target by requiring the size and conductivity of the MOF nanofilm, and effectively amplifies the electrical signal through the Faraday cage structure, and has excellent detection specificity and sensitivity.

The invention relates to the technical field of optocouplers, in particular to a common-mode interference resistant optocoupler packaging structure based on condenser integration. The projection of the MYLAR collecting lens on a virtual plane completely covers elements on an IR pin and a PT pin base island, 120-degree divergent light of an IR chip is focused to a light spot with the diameter being 0.15 mm, the energy density reaches 230 mW / mm, 8mA driving current can output 18.2 V, a Faraday cage is formed by means of an aluminum plating layer on the surface of the MYLAR collecting lens, stray capacitance is reduced to 0.5 pF under the distance being 0.3 mm, + / -80 V common-mode pulse interference can be resisted, and the requirement for high-power LED light sources is met. The light-transmitting positioning column is arranged along the optical axis of the MYLAR collecting lens, so that the position of a light spot is more accurate and concentrated in a photosensitive area of the PVG, and stable light energy input is provided for the PVG; the technical problems that an existing ternary LED is insufficient in light intensity, the optical axis temperature electric leakage of a quaternary LED is large, and the small size and the anti-interference requirement repel each other are solved.

The invention relates to a nested high-voltage generator and a high-voltage generation method thereof. The nested high-voltage generator comprises an independent sub-power supply, a capacitor, an electrode plate and a conductive shell, the independent sub-power supply is connected in series with the electrode plate and connected in parallel with the capacitor to form a high-voltage generating circuit; the conductive shell surrounds the outer side of the high-voltage generating circuit to form a Faraday cage, and the independent sub power supply and the capacitor are arranged in the conductive shell; a plurality of Faraday cages exist, the plurality of Faraday cages are nested, and the Faraday cage nested in the inner layer is placed in the conductive shell nested in the Faraday cage nested in the outer layer; the independent sub-power supply of the nested inner layer is connected in series with the independent power supply of the nested outer layer, and the capacitor of the nested inner layer is connected in series with the capacitor of the nested outer layer. The nested high-voltage generating circuit is provided with a plurality of independent sub-power supplies, each independent sub-power supply can independently supply power, when any one of the independent sub-power supplies is damaged, the other high-voltage generating circuits can work independently, normal use is not affected, and the technical effect of reducing regular maintenance cost and repair cost of the high-voltage generator is achieved.

The utility model discloses a photovoltaic assembly, which comprises a photovoltaic body, the first shielding layer is arranged on one side of the photovoltaic body; the second shielding layer is arranged on the other side of the photovoltaic body; the photovoltaic body, the first shielding layer and the second shielding layer are installed in the frame, the frame is electrically connected with the first shielding layer and the second shielding layer, and the frame is used for being grounded through a grounding device. According to the photovoltaic assembly provided by the embodiment of the utility model, the frame, the first shielding layer and the second shielding layer are electrically connected to form the Faraday cage, so that the photovoltaic assembly can block the influence of external static and non-static electromagnetic fields, the electromagnetic shielding performance of the photovoltaic assembly is improved, and lightning protection is effectively realized.

A radiation-free heating pad and a processing technology thereof is provided. The radiation-free heating pad includes heating wires, a fiber layer, a flexible shielding layer, and a reinforcement layer. The heating wires are uniformly arranged on the fiber layer in a serpentine pattern, a layer of aluminum foil is arranged on each of an upper side and a lower side of the fiber layer, and the aluminum foil tightly wraps the heating wire. The flexible shielding layer is arranged outside the aluminum foil, and the reinforcement layer is arranged outside the flexible shielding layer. The radiation-free heating pad is based on the Faraday cage effect, and an electromagnetic field generated when an electric current passes through the heating wire can be effectively counteracted by a double shielding structure composed of the aluminum foil and the flexible shielding layer.

The invention discloses a coaxial vertical double-transistor capacitance-free dynamic random access memory unit and a preparation method thereof, and belongs to the field of semiconductor integrated circuits. According to the DRAM unit, a writing transistor and a reading transistor are three-dimensionally integrated in the form of a coaxial cylinder, the reading transistor is located in an inner core, and the writing transistor is coaxially wrapped on the periphery. According to the structure, the occupied area of the unit is reduced to the projected area of one nanorod, the limit density of 4F2 can be reached theoretically, and a storage capacitor of a traditional DRAM is thoroughly removed. And the peripheral write transistor forms a Faraday cage, so that the storage nodes are effectively prevented from being interfered by the outside, and the data retention capability is remarkably improved. The read transistor of the kernel naturally forms a surrounding gate structure, has an extremely high switching current ratio, and provides a strong read-out signal. The invention also provides a preparation process compatible with the unit. The cell structure is suitable for a next generation memory product with high density and low power consumption.

This invention provides a measurement method and apparatus that can reduce the cost of developing equipment for measuring the number concentration of fine particles using the diffusion charging method. [Solution] The method for measuring the number concentration of particulate matter involves measuring the number concentration of particulate matter in a gas by the diffusion charging method. The method for measuring the number concentration of particulate matter involves alternately introducing the gas containing particulate matter, which has been ionized by corona discharge and onto which generated ions adhere to the particulate matter, and the air that has passed through the filter 6 into the Faraday cage 11, and measuring the induced current generated to determine the number concentration.

The disclosure is directed to a system for blocking electromagnetic signals by using magnets to seal a container opening, effectively forming a Faraday cage around electronic devices. In some embodiments, the system comprises a pouch body, a shielding pocket, and a lock mechanism. The shielding pocket, positioned within the pouch body, is constructed from materials such as metalized fabrics and conductive threads, which attenuate electromagnetic signals. The pocket includes an opening for device insertion, which is secured by magnetic materials positioned on opposing sides, ensuring continuous electrical contact and preventing signal leakage. In some embodiments, the lock mechanism, featuring first and second lock bodies, further secures the opening, enhancing the electromagnetic shielding properties. Various example implementations of the system include configurations such as discrete magnets and / or strips of magnetic material configured to force and / or maintain the shielding material together to substantially prevent the electronic device from transmitting and / or receiving signals.

An aerosol-generating device comprises a receptacle configured to hold an aerosol-generating material. A microwave heater is disposed within the receptacle and configured to receive power supplied from a power source to irradiate the receptacle with microwave radiation therewith to heat the aerosol-generating material to generate an aerosol for delivery to a user. A Faraday cage assembly prevents the transmission therethrough of microwave radiation emitted within the receptacle by the microwave heater. The Faraday cage assembly comprises an array of through-openings via which said aerosol is deliverable to a user from within the receptacle.

The utility model relates to an anti-interference wireless signal transmitting board, and belongs to the technical field of wireless signal transmitting boards, the anti-interference wireless signal transmitting board comprises a mounting board, the outer side of the mounting board is fixedly connected with a protective shell, the protective shell is internally provided with a substrate assembly, the substrate assembly comprises a double-layer PCB, the upper layer of the double-layer PCB is a signal wiring layer, and the lower layer of the double-layer PCB is a grounding layer. The beneficial effects of the utility model are that when an external signal enters the substrate assembly through the signal input line, the external signal enters the signal wiring layer after the out-of-band noise is filtered by the LC filter circuit board, the common mode choke suppresses the high-frequency common mode interference of the power supply circuit, and the nanocrystalline alloy film absorbs high-frequency electromagnetic waves through magnetic loss, so that the high-frequency interference of the power supply circuit can be suppressed. And meanwhile, the grounding layer forms a Faraday cage effect to shield low-frequency interference, so that full-band interference suppression of the substrate assembly can be realized under the synergistic effect of the nanocrystalline alloy film, the common-mode choke and the grounding layer, and signal communication can be more stable.

Power electronic module, its manufacturing process and vehicle comprising such a module The invention relates to a power electronic module (1) comprising a protective housing (2), forming a Faraday cage and preferably sealed, and at least one circuit, component or set of power electronic components (3) housed in the latter, the housing (2) being formed of two constituent parts (4, 4') assembled together peripherally.This module is characterized in that at least one (4) of its two constituent parts (4, 4') consists of a formed metal sheet on which a liquid cooling circuit (6) is attached or formed at a functional region (5') of its outer face (5), and in that said at least one power electronic circuit, component, or set of components (3) is mounted against the inner face (5'') of the sheet metal part (4) and opposite the aforementioned outer functional region (5'). Figure to be published with the abbreviation: Fig. 1C.

The invention provides a train entry and exit identification method based on a platform door, and relates to the technical field of platform safety, and the method comprises the following steps: obtaining an initial energy value A1 of an inductor receiving electromagnetic wave reflection; if the electromagnetic wave reflection energy value in front of the sensor becomes A2, the train enters the station; if the electromagnetic wave reflection energy value in front of the sensor becomes A3, the train opens the door; if the electromagnetic wave reflection energy value in front of the sensor is equal to A2 again, the train is closed; if the electromagnetic wave reflection energy value in front of the sensor is equal to A1 again, the train leaves the station, and train entering and exiting identification is completed. The electromagnetic wave radar is directly arranged on the stand column of the safety door, electromagnetic wave echoes are received after electromagnetic waves are emitted, train station entering and exiting and door opening and closing are effectively recognized according to echo energy values of the train in different states, and the train state is accurately recognized by effectively utilizing the Faraday cage characteristic formed by the material of the train during recognition. The safety door can be effectively matched with the train to be opened and closed, and train entering and exiting safety is guaranteed.

The disclosure is directed to a system configured to protect a chipset and / or central processing unit (CPU) from electrical interference and physical damage, while also addressing heat management issues prevalent in traditional shield case designs. The system includes a heat sink, a grounding shield, and a printed circuit board (PCB), that work in conjunction to protect and remove heat. The heat sink is both electrically and thermally conductive, facilitating heat removal from the PCB, CPU, and / or chipset. The grounding shield, in conjunction with the heat sink, forms a Faraday cage or electrical shielding around the PCB and / or chipset, safeguarding sensitive electronic components from external electromagnetic interference, static discharge, and mechanical damage. The system also improves airflow and efficiency, and transfers heat generated from the PCB, chipset, CPU, and electrical contact to the heat sink. This mitigates the risk of overheating, enhancing the performance and lifespan of the chips.

The invention belongs to the technical field of power supplies, and relates to a composite-structure high-power-density power supply module with electromagnetic shielding and heat dissipation, which comprises a top plate, a middle layer and a bottom plate which are sequentially arranged at intervals, the top plate is composed of a metal electromagnetic shielding layer and a first heat dissipation layer, and the bottom plate is a second heat dissipation layer; two heat conduction layers; and a plurality of metal strips. The top plate, the middle layer and the bottom plate form the three-dimensional structure, the utilization rate of the power module in the three-dimensional space is increased, power can flow in the three-dimensional structure, heat is prevented from being locally accumulated, meanwhile, the multiple metal strips are matched with the two heat conduction layers, the first heat dissipation layer and the second heat dissipation layer for heat dissipation, and the heat dissipation efficiency is improved. In addition, the plurality of metal strips are matched with the metal electromagnetic shielding layer to form a Faraday cage for electromagnetic shielding, so that electromagnetic interference can be shielded, the stability of system operation is improved, and normal operation of other equipment is ensured.

This invention belongs to the field of microphone technology, and specifically relates to a microphone and audio device. A microphone includes a microphone stand, and a pickup component, a touch module, a shielding structure, and a main control circuit board disposed on the microphone stand. The microphone stand has a pickup cavity, the pickup component is disposed within the pickup cavity, and the pickup component is positioned between the touch module and the main control circuit board. Both the touch module and the pickup component are electrically connected to the main control circuit board. The shielding structure surrounds the pickup component, isolating it from interference from the touch module, the main control circuit board, and the wires between them. By surrounding the pickup component with the shielding structure, a Faraday cage structure is constructed in three dimensions, forming a comprehensive electromagnetic isolation zone. This effectively isolates electric fields and high-frequency interference from the top touch circuit, side wires, and the bottom main control circuit board, improving the microphone's acoustic performance.

The present invention provides a back-to-ear MEMS microphone structure and its packaging structure. The back-to-ear MEMS microphone structure includes a conductive structure located between a diaphragm and a substrate, forming a structural connection between the diaphragm and the substrate. Since both the diaphragm material and the substrate are conductive, an electrical connection is also achieved between the two. The conductive structure may include a first conductive portion located on the outer side wall of the bracket, a second conductive portion located on the inner side wall of the bracket, and may also include a third conductive portion located inside the bracket, which can enhance the electrical connection effect between the diaphragm and the substrate. The packaging structure of the present invention includes a circuit board, a metal packaging shell, the above-mentioned MEMS microphone structure and a dedicated integrated circuit. The packaging structure can realize that the back electrode is located in a Faraday cage composed of a diaphragm, a substrate, a circuit board and a metal packaging shell, thereby effectively shielding external radio frequency interference signals and effectively improving the anti-radio frequency interference capability of the back-to-ear MEMS microphone.