77results about How to "Reduce electromagnetic leakage" patented technology

An antenna apparatus has a ground plane and a traveling-wave linear antenna The ground plane has a dielectric layer and metallic plates disposed on the dielectric layer. The plates placed on a front side of the ground plane act as a band gap surface. The dielectric constant and thickness of the dielectric layer, the number of plates and the width of spaces among the plates are adjusted, so that the band gap surface prevents propagation of electromagnetic waves within a specific frequency band. The antenna is disposed over the band gap surface on the front side of the ground plane to be spaced away from the band gap surface. The antenna radiates electromagnetic waves of an operational frequency within the specific frequency band in response to an alternating current of the operational frequency fed to the linear antenna.

Multi-tuner receivers with cross talk reduction are disclosed. In one embodiment, a multi-tuner receiver with cross talk reduction includes a low noise amplifier, a set of interstage filters and a set of corresponding tuners. In an alternative embodiment, a multi-tuner receiver with cross talk reduction includes a passive splitter, a set of interstage filters and a set of corresponding tuners. The interstage filters can be low-pass, high-pass or band-pass filters depending on the particular frequency range of interest. Typical embodiments can have two or three tuners, however, the invention applies to multi-receiver tuners with more than three tuners. The multi-tuner receivers can be used within television, cable set top boxes and other devices that receive multiple video signals.

The invention discloses an online automatic balance executing device of a rotor of a machine rotating at a high speed, which comprises a static disc, a dynamic disc and a dynamic disc mounting shaft sleeve, wherein the static disc is arranged on the end cap of the rotor; the dynamic disc is arranged on the dynamic disc mounting shaft sleeve; the dynamic disc mounting shaft sleeve is arranged on the high-speed rotor through interference fit; and the static disc and the dynamic disc are provided with two concentric annular rotating transformer structures respectively, and the energy transfer between the static disc and the dynamic disc are realized through electromagnetic induction. The inside of the dynamic disc is provided with a rotatable adjusting mechanism consisting of a fixed ring and a rotating ring. The fixed ring generates traveling-wave vibration to drive the rotating ring to rotate through friction. The rotating ring is provided with a counterweight, and when rotating relative to the rotor of the machine rotating at the high speed, the rotating ring adjusts the center of gravity of the rotor of the machine rotating at the high speed to an axle center to reduce the vibration of the vibration of the high-speed rotor. The device of the invention can reduce the vibration caused by an unbalance main shaft during the operation of the machine rotating at the high speed and improve the operation state of the machine rotating at the high speed.

The invention aims at providing a simply supported beam type dynamic vibration absorber with adjustable frequency. The dynamic vibration absorber comprises a base, a stepping motor, two sliding blocks, a transmission screw and a metallic beam, wherein the base is provided with dovetail grooves, the lower end parts of the sliding blocks are of dovetail-shaped structures, support arms with holes are arranged at the upper end parts of the sliding blocks, threaded through holes are formed in the middle parts of the sliding blocks, the lower end parts of the two sliding blocks are mounted in the dovetail grooves, a concentrated mass block is arranged at the middle part of the metallic beam, the two ends of the metallic beam respectively penetrate through the holes of the support arms at the upper end parts of the two sliding blocks, reverse threads are symmetrically formed in the external wall of the transmission screw, the transmission screw penetrates through the through holes in the middle parts of the two sliding blocks and is matched with threads of the two through holes, and a first end of the transmission screw is connected with the stepping motor. According to the dynamic vibration absorber, the defect that the traditional helical-spring vibration absorber is easily affected by mounting pre-tightening force is overcome; compared with the cantilever vibration absorber, the requirements on outward extending space are reduced; compared with the electromagnetic and electric tunable vibration absorbers, the electromagnetic leakage is less.

The invention discloses a rotor online automatic balancing device of a high-speed rotating machine, which comprises a fixed disk, a movable disk and a movable disk end cover, wherein the fixed disk isinstalled on a rotor end cover, the movable disk end cover is installed on the movable disk, and the movable disk is installed on a high-speed rotor by interference fit; and two concentric annular rotating transformer structures are respectively designed on the fixed disk and the movable disk and realize the energy transfer between the fixed disk and the movable disk by electromagnetic induction.A rotatable adjusting mechanism is designed in the movable disk and comprises a fixed ring and a rotating ring, wherein the fixed ring generates traveling wave vibration and drives the rotating ringto rotate by friction force. A counterweight is arranged on the rotating ring; and when the counterweight generates rotation relative to the rotor of the high-speed rotating machine, the rotor gravitycenter of the high-speed rotating machine is adjusted on an axle center so as to achieve the aim for reducing the vibration of the high-speed rotor. By adopting the device, the vibration caused by anunbalanced main axle can be reduced when the high-speed rotating machine is operated and the running state of the high-speed rotating machine is improved.

The disclosed electromagnetic wave transmission medium prevents electromagnetic leakage during high-power electromagnetic wave transmission. The sheet-form electromagnetic wave transmission medium is configured from a first mesh conductor used in transmission of electromagnetic waves having a first power; and a second mesh conductor used in transmission of electromagnetic waves having a second power. By using two mesh conductors, when said sheet-form electromagnetic wave transmission medium is used, the conduction density of the surface region where electromagnetic waves are extracted to be used for power supply assumes a coarser state than that of the other surface region.

Radio frequency (RF) power generator including an outer enclosure having a system cavity. The outer enclosure separates the system cavity from an exterior of the RF power generator. The outer enclosure is configured to reduce leakage of the electromagnetic radiation into the exterior. The RF power generator also includes a feedthrough assembly comprising a coaxial line configured to receive electric power generated by an RF amplification system. The coaxial line is positioned within the system cavity and has inner and outer conductors. The feedthrough assembly includes a connector shield that forms a feedthrough to the exterior of the RF power generator. The connector shield is electrically coupled to the outer conductor of the coaxial line and integrated with the outer enclosure to reduce leakage of electromagnetic radiation into the exterior.

The invention discloses a wireless charging system with an in vivo detection function. The wireless charging system comprises a transmitting terminal metal plate which is arranged close to or clings to a transmitting terminal coil, wherein the transmitting terminal metal plate is connected with an oscillating circuit and a capacitive digital converter in sequence; a transmitting terminal MCU (Microprogrammed Control Unit) is connected with the capacitive digital converter, and is used for acquiring a digital signal of the capacitive digital converter and generating a control signal of the system according to the acquired digital signal. A wireless electric energy transmission method with the in vivo detection function comprises the following steps: setting a capacitance threshold value at the transmitting terminal CPU; judging a relation between capacitance output by the capacitive digital converter and the capacitance threshold value in order judge whether a living body enters the wireless electric energy transmission system or not. By adopting the system and the method, the presence of living beings in magnetic fields of the transmission terminal coil and a receiving terminal coil can be recognized, and the security of the wireless electric energy transmission system can be improved greatly.

A coaxial type impedance matching device includes a matching device body including an external conductor and an internal conductor arranged in the external conductor, an input side dielectric disposed in the matching device body and including a first dielectric and a second dielectric, and an output side dielectric disposed in the matching device body and including a third dielectric and a fourth dielectric. Distance between opposed surfaces of the first dielectric and the second dielectric is a predetermined distance, which is in a range of Nλ / 4−λ / 6 to Nλ / 4−λ / 6, where λ represents a guide wavelength of an input signal in the matching device body and N represents odd number. Distance between opposed surfaces of the third dielectric and the fourth dielectric is the predetermined distance.

The invention relates to a low-temperature co-fired ceramic common mode filter for eliminating signal interference on an electronic apparatus. A sheet type low-temperature co-fired ceramic common mode filter produces a low-temperature co-fired ceramic by laminating tape-casted unripe ceramic tapes, n layers of left coils and right coils are printed in the low-temperature co-fired ceramic, where n>=5, an n-th layer and a first layer are pin layers respectively; the filter is characterised in that: a joint heat of a left coil's end of a lower layer and a right coil's end of an upper layer is stagger with a joint head of a left coil's end of the upper layer and a right coil's end of a more upper layer, and a joint heat of the other end of a right coil of the lower layer and the other end of the left coil of the upper layer is stagger with a joint heat of the other end of a right coil of the upper layer and the other end of the left coil of the more upper layer. The invention has characteristic of more ideal high-frequency performance, low differential mode impedance and low manufacturing cost.

The invention discloses an LCP material based millimeter-wave antenna system and a mobile terminal. The millimeter-wave antenna system comprises an antenna assembly, the antenna assembly comprises anantenna layer, a substrate layer and a circuit layer, the system is characterized in that the substrate layer is made of an LCP material, the antenna layer and the circuit layer are arranged in two side surfaces, opposite to each other, of the substrate layer, and the antenna layer is electrically connected with the circuit layer. The LCP material serves as the substrate layer, the antenna layer and the circuit layer are integrated, use of a board-to-board connector is avoided, the cost can be reduced, electromagnetic leakage is reduced, and the stability of the antenna system is improved; theLCP material is low is loss, and extra loss caused by a connector can be avoided effectively; and the LCP material is flexible and can be molded by folding, can be integrated with other parts, and occupies small space, and thus, the mobile terminal can be thinner. The antenna system is simple in structure and high in antenna performance.

The invention discloses a compression-resistant type coaxial cable for improving a shielding effect, and a connection method thereof. The invention relates to the technical field of coaxial cable connection, in particular to the compression-resistant type coaxial cable and the connection method thereof. According to the compression-resistant type coaxial cable, a cable body is compressed and connected with a connector by means of a metal casing pipe provided with an elastic rubber sleeve, the compression-resistant type coaxial cable is suitable to be used in a strong vibration and shock environment, the compression joint strength is high, the tension resistance is good, the radial section of the metal casing pipe is a regular hexagon, no flash is formed after compression joint, the injection molding thickness of a protective injection molding layer is even, the shielding effect for the connector is good, the shielding performance of the coaxial cable is improved, the metal casing pipe further ensures that the coaxial cable is arranged at the dead centre of the connector after installation, can effectively eliminating point discharge, enables the stress to be distributed more evenly, can play a role of voltage equalizing ring so that an electric field at the joint is distributed to the peripheral grounding region, avoids the occurrence of corona discharge, and cannot cause any damage to the cable and the machine.

The invention provides a blind-mating radio frequency coaxial connector. The blind-mating radio frequency coaxial connector comprises a female connector and a male connector, wherein the female connector and the male connector are matched and butted, the female connector comprises a first inner conductor, a first outer conductor and a first insulator, the first inner conductor is provided with a strip-shaped accommodating cavity, a clamping ring is arranged on an outer surface, near to a port, of the first outer conductor, the first insulator is used for separating the first inner conductor from the first outer conductor, the male connector comprises a second inner conductor, a second outer conductor and a second insulator, the inner conductor is provided with an extension part, the extension part can be inserted to the accommodating cavity of the first inner conductor, the second outer conductor is provided with an inner cavity and a joint, the inner cavity is connected with the first outer conductor and is tightly matched with the clamping ring on the first outer conductor, the joint can be connected with the first outer conductor in an encircling way and is provided with a plurality of split grooves, the second insulator is used for separating the second inner conductor from the second outer conductor, and a guide hole is formed in a port of the first insulator and is used for guiding the extension part inserted to the accommodating cavity. By the blind-mating radio frequency coaxial connector, the matching of the female connector and the male connector is effectively improved, and low electromagnetic leakage and low intermodulation are ensured.

A two-channel directional antenna for use in a radar level gauge. The antenna comprises a partition wall the antenna into a first partition for emitting an electromagnetic transmit signal, and a second partition for receiving an electromagnetic echo signal, the partition wall having an outer potion located downstream in a direction of radiation of the antenna. The partition wall comprises an electromagnetic de-coupling structure, which is arranged to reduce any leakage of electromagnetic energy from the transmit signal into the echo signal.The electromagnetic de-coupling structure according to the present invention ensures that the leakage of transmit signal into the received signal is reduced to a satisfactory level.

The invention discloses a core for a composite induction transformer. The core comprises an upper iron yoke, a lower iron yoke and a middle column, wherein the upper and lower iron yokes are matched; and the middle column is arranged between the upper and lower iron yokes. According to the core for the composite induction transformer, core loss can be reduced, and the efficiency of the induction transformer can be improved.

The invention belongs to the field of electromagnetic energy conversion, and particularly relates to an electrical small structure non-totally-enclosed electromagnetic energy converter and an electronic cigarette with the same. The electrical small structure non-totally-enclosed electromagnetic energy converter comprises an energy conversion cavity and an electromagnetic excitation device installed in the energy conversion cavity, wherein the energy conversion cavity is of a non-totally-enclosed metal structure, the electromagnetic excitation device is composed of a dielectric substrate and ametal surface, a metal wire is wound in the dielectric substrate to form a circuit of the electromagnetic excitation device, the metal surface is an independent component and is not connected with a metal component of the energy conversion cavity, an extension line of one end of the metal wire of the electromagnetic excitation device is led to the outside from the inside of the energy conversion cavity through a via hole of the metal surface, and the energy conversion cavity is filled with a dielectric material. According to the invention, the electromagnetic energy converter is realized in anon-totally-enclosed space of an electric small structure, the electronic cigarette is introduced into an electronic cigarette tube filled with a cigarette material in a microwave mode based on electromagnetic energy, and the microwave energy resonates with cigarette material molecules to convert the electromagnetic energy into heat energy for igniting the cigarette material to generate smoke.

The invention discloses an electromagnetic shielding method for communication equipment. According to the electromagnetic shielding method, a communication equipment body is provided, wherein the communication equipment body comprises a control panel; the control panel comprises an alloy lining plate and a circuit board; a machine case body for installing the communication equipment body is arranged; a shielding case is arranged at the inner side of the alloy lining plate and completely covers the circuit board; a cooling fin coated with a heat-conducting insulated coating is arranged between the shielding case and the circuit board; the cooling fin is arranged in a folding manner in a wave shape; the upper side of the cooling fin is in contact with the circuit board; the lower side of the cooling fin is in contact with the shielding case; electromagnetic shielding gaskets are arranged between the edge part of the shielding case and the alloy lining plate; a faucet is arranged on the circuit board; an electromagnetic shielding seal sleeve is arranged between the faucet and the alloy lining plate; cables are arranged on the circuit board; feed-through capacitors are arranged between the cables and the shielding case; the cables pass through the shielding case through the feed-through capacitors and are connected with electronic components; the alloy lining plate is fastened to an open side of the machine case body; and electromagnetic shielding seal strips are arranged on the fastened parts. The invention further discloses the communication equipment with the electromagnetic shielding function.

The invention discloses a method for preparing an electromagnetic shielding material, which comprises the following steps: 1) preparing the following components in parts by weight: 70-80 parts by weight of silicon rubber; 20-30 parts by polytetrafluoroethylene; 2-3 parts by weight of nano-scale graphite powder; Curing agent ~ 2; heat stabilizer 1 ~ 2; 2) forming a composite rubber mixture uniformly infiltrated with nano-scale graphite particles in a molten state; 3) injecting the composite rubber mixture in step 2) into the mold cavity of the forming mold, and Completely wrap the wire mesh inside; 4) In a negative pressure environment, vibrate the forming mold through a vibrator to remove the internal air bubbles; 5) High pressure and low temperature, rapid cooling and solidification, to obtain a semi-finished electromagnetic shielding material; 6 ) heat and melt the semi-finished electromagnetic shielding material again, and cool and solidify naturally at high pressure and normal temperature to obtain the electromagnetic shielding material. The invention also discloses the electromagnetic shielding material prepared by the method, the corresponding electromagnetic shielding gasket, and the electromagnetic shielding button terminal using the electromagnetic shielding gasket.

In a copier 1, when RFID wireless communication is performed between a first transmitter-receiver 18 and a wireless tag 21 fitted to a toner container 20, based on a table in which different transmission output values of the first transmitter-receiver 18 are written from the lower limit value to the upper limit value, wireless communication is first performed at the lower limit transmission output value, and if a CPU 10 finds that RFID wireless communication is not being performed properly, the first transmitter-receiver increases its transmission output stepwise according to the table until proper wireless communication is achieved.

The invention discloses a vehicle wireless charging auxiliary parking system and method. The vehicle wireless auxiliary parking system comprises a first inverter, an output induction coil, a receiving induction coil, an auxiliary induction coil, a controller, a Bluetooth device, a user hand-held terminal, a second inverter and an on-board battery. The input end of the first inverter is connected with a power grid. The output end of the first inverter is connected with the input end of the output induction coil. The output induction coil is matched with the receiving induction coil and the auxiliary induction coil. The output end of the receiving induction coil is connected with the input end of the second inverter. The invention further discloses the vehicle wireless charging auxiliary parking method. According to the vehicle wireless charging auxiliary parking system and method, the distance between a parked vehicle and the output induction coil is detected in time, the receiving induction coil is prevented from deviating from the output induction oil, electromagnetic quantity leakage in the wireless charging process is reduced, the wireless charging efficiency is improved, a user is reminded of parking position deviation and the deviation position in time, and the parking position is corrected conveniently.

The invention relates to a gas density monitor. A multifunctional gas density relay comprises an intelligent microprocessor, a pressure sensor, a temperature sensor, a communication module and a memory. The pressure sensor is communicated with a gas circuit of the gas density monitor. The intelligent microprocessor is connected with the temperature sensor, the pressure sensor and the communicationmodule. The intelligent microprocessor collects a pressure signal through the pressure sensor and collects a temperature signal through the temperature sensor at the set sampling frequency, and a corresponding density value P20 is obtained through processing of the intelligent microprocessor; and the depth of the obtained corresponding density value P20 is calculated to obtain an accurate densityvalue P20. An alarm is raised according to the set alarm density value P20, and when the monitored density value P20 is accurately equivalent to or lower than the alarm density value P20 for alarming, the monitor sends out an alarm signal and sends out alarm notice information; and the alarm notice information is uploaded. Thus, gas insulation equipment can be monitored, a fault can be diagnosedtimely, and the safety of the power grid is ensured.

An optical module is attachable to and detachable from a cage. The optical module includes a module case, a slider attached to the outside of the module case for releasing coming-off prevention from the cage, and a leakage reducing layer intervening between the module case and the slider to reduce leakage of an electromagnetic wave.

The invention relates to the technical field of electromagnetic shielding material preparation, and in particular to a method for preparing a coated electromagnetic shielding material. Toluene diisocyanate, isophorone diisocyanate and polyethylene glycol as raw materials are reacted to obtain an elastic polyurethane prepolymer, and a photo-curing initiator, nano-spherical silver powder and flake silver powder are added to the elastic polyurethane prepolymer to obtain the coated electromagnetic shielding material. The electromagnetic shielding material can coat light matrixes such as plastics to achieve electromagnetic shielding effect, and the cost of the electromagnetic shielding material is effectively controlled while the electromagnetic shielding effect is guaranteed. Nano-conductive particles aggregate with each other by Brownian motion of the nano-conductive particles to form a conductive network, and the conductivity of the electromagnetic shielding material after curing is improved. In addition, in the process of UV light curing of the coating, the filling effect of conductive silver particles in pores among resin particles is better, so that shrinkage of the coating decreases during curing, and the application prospect is broad.

The invention discloses a sheet type common-mode choke row, which comprises an upper substrate layer, a lower substrate layer and at least two stacked common-mode chokes, wherein the stacked common-mode chokes comprise coil layers provided with conductive coil patterns are and are stacked between the upper substrate layer and the lower substrate layer, and each two adjacent common-mode chokes are spaced by a middle substrate layer. Compared with the prior art, the arrangement of the two common-mode chokes are changed into vertical stacking, as shown as the picture 3, magnetic force lines of the coils of the two common-mode choke are identical in direction, and accordingly inductance of the single coil can be improved effectively. Meanwhile, when the stacking manner is compared with the horizontal arrangement, the coiled area of the coils is increased, the number of the coil layers for obtaining identical impedance is smaller, dispersion capacitance among layers is reduced, peak frequency can be increased by reducing the number of the coil layers, and the sheet type common-mode choke row can be applicable to the high-frequency range. Besides, occupation proportion of a non-overlapped area Z to the area of the coils is reduced, the area of an effective coupling area formed by the coils is increased, electromagnetic leakage is reduced, and difference-mode impedance of devices is lowered.