81results about How to "Solve the shielding effect" patented technology

The invention discloses an inertial vision integrated navigation method based on an optical flow method, relates to an inertial vision integrated navigation method, and has the purpose of solving theproblems that the navigation information is inaccurate due to cumulative errors caused by the existing inertial navigation working for a long time, a mask interruption or an excessive dynamic error may happen when the existing satellite navigation is indoor or shielded by a building, and the algorithm of the existing vision navigation is complex and susceptible to camera pose, illumination changes, image noise and the like. The method comprises the following processes: 1, defining a coordinate system; 2, carrying three sensors of an IMU (Inertial Measurement Unit), a camera and an altimeter onthe drone to obtain two-dimensional optical flow data; 3, obtaining the position of the drone in the world coordinate system; 4, performing inertial navigation according to the IMU measuring information to calculate the position and attitude of the drone in the world coordinate system; and 5, obtaining the position and attitude information of the merged drone in the world coordinate system. The method is used in the technical field of autonomous navigation of drones.

The invention relates to anti-radiation concrete produced from slag aggregate, and a production method thereof so as to effectively consume and utilize mineral waste, and improve an anti-radiation performance and durability of concrete. The anti-radiation concrete produced from slag aggregate comprises the following raw materials, by weight, 140-190 parts of water, 350-630 parts of a cementing material, 750-850 parts of a fine aggregate, 1000-1500 parts of a coarse aggregate, 0.35-1.9 parts of a tackifier, 2.1-7.5 parts of a water reducing agent, and 30-70 parts of fibers, wherein the cementing material comprises cement and a mineral admixture, the mineral admixture comprises silicon ash and fly ash, the cementing material comprises 300-500 parts by weight of the cement, 20-60 parts by weight of the silicon ash and 30-70 parts by weight of the fly ash, the coarse aggregate is a high titanium heavy slag coarse aggregate, the fine aggregate comprises high titanium heavy slag sand and lead powder according to a mass ratio of 1:0.2-3.0, the tackifier is methyl cellulose ether, and the fibers are one or a plurality of material selected from polypropylene fibers, steel fibers and lead fibers.

The invention provides an optical transparent frequency selecting surface structure and a manufacturing method, and belongs to the technical field of optical windows. The frequency selecting surface structure comprises a substrate and transparent mesh films which are distributed on the surface of the substrate and are provided with periodic hole arrays. The manufacturing method comprises the following steps of coating the upper surface of the substrate by using mask liquid; naturally drying the mask liquid to form a crack template under specific conditions; depositing a conductive metal layer on the surface of the crack template; removing the crack template to obtain the continuous transparent mesh films; manufacturing hole array mask structures or complementary structures thereof on the transparent mesh films; removing the transparent mesh films which are not wrapped by the mask structures; and removing the mask structures to obtain the optical transparent frequency selecting surface structure. By the optical transparent frequency selecting surface structure, the problem that the light transmittance performance of an optical window is reduced due to increasing of a metal line width is solved, the circumstance that the light transmittance performance and the electromagnetic shielding performance of the optical window are reduced simultaneously in the traditional mechanical friction mode is avoided, and specific processing conditions for solving the problem of non-uniform distribution of high-order diffraction energy are given.

The invention provides a thin-coating two-component anticorrosive coating for the surface of a precise steel structural part, wherein the two-component anticorrosive coating is composed of a componentA and a component B. The component A is composed of an epoxy resin liquid, graphene slurry, a zinc powder, flaky pigments and fillers, an auxiliary agent and a diluent. The component B is composed ofa polyamide curing agent and a mixture of xylene, n-butanol and cyclohexanone. The component A and the component B are evenly mixed according to the weight ratio of (5-15):1. The graphene slurry is prepared by adding powdery graphene and a dispersant into a mixed solvent under a stirring state, and dispersing in an ultrasonic oscillator to obtain the stable dispersed slurry. A coating layer has excellent cathodic protection effect, can be thin-coated to about 10-15 microns, still has good corrosion resistance, and can partly replace traditional phosphorization and oxidation processes.

The invention discloses a magnetic leakage field shield method of a wireless electric energy transmission system. The method employs a magnetic leakage field shield apparatus of the wireless electric energy transmission system. The apparatus comprises a power transmission end coil and a power receiving end coil which are in parallel arrangement. A magnetic leakage field shield device is vertically arranged at one side of the power transmission end coil and the power receiving end coil, an electrical device and people are respectively arranged at the other side of the magnetic leakage field shield device. The method provided by the invention solves the problems of unadjustable shield capability and poor shield tracking performance of a passive shield device in a passive shield method, and solves the problems of quite large loss power and incapability of forming a closed loop self-adjusting shield effect in an active shield method. The magnetic leakage field size of the wireless electric energy transmission system is detected by use of a single-chip microcomputer, according to a magnetic leakage field value, the input size of the parallel capacitor combination of a passive coil is given through calculating, and a magnetic leakage field shield function is realized in a dynamic closed loop mode, such that the unfavorable influences caused by an electromagnetic field to surrounding human bodies and electrical devices are effectively reduced.

The invention discloses an OFDM (orthogonal frequency division multiplexing) modulation-based high-speed rail mobile communication method and system. An RRU (radio remote unit) is arranged in a train compartment, and the RRU is communicated with a far-end machine room by a power line connected with a train; the communication between the machine room and the far end of the RRU adopts an OFDM modulation mode; along with an up direction, a signal which is transmitted by a mobile station is transmitted to the far end of the RRU by means of OFDM, is converted by means of down-conversion and D / A (digital-to-analogy) conversion, is coupled to the power line to be transmitted, and is subjected to base band processing in the far-end machine room; and along with a down direction, the machine room is used for modulating a baseband signal into an OFDM signal, wherein the OFDM signal is coupled to the power line to be transmitted, is received at a radio remote end of a base station, is converted by means of A / D (analogy-to-digital) conversion and up-conversion, and is transmitted to the mobile station by the radio remote end of the base station, so that the voice / data communication can be realized.

The invention discloses a carbonyl iron / graphene / polyvinylpyrrolidone compound wave-absorbing material, a preparation method thereof and the prepared wave-absorbing plate prepared by the method. The carbonyl iron / graphene / polyvinylpyrrolidone compound wave-absorbing material comprises a carbonyl iron powder core layer, a reduction-oxidation graphene layer which is coated on the periphery of the carbonyl iron powder core layer and a polyvinylpyrrolidone layer which is coated on the periphery of the reduction-oxidation graphene layer. The carbonyl iron / graphene / polyvinylpyrrolidone compound wave-absorbing material disclosed by the invention is characterized by simple preparation process, strong electromagnetic wave absorption capacity, wide frequency bandwidth, low cost and important application value in the fields of microwave absorption, electromagnetic leakage solution, electromagnetic shielding, and the like.

The invention relates to a piece of electromagnetic shielding glass and a manufacturing method thereof, specifically, to a piece of light high-intensity electromagnetic windshield glass with an electric heating function and a manufacturing method thereof. A metal grid structure is prepared on a flexible substrate to realize the electromagnetic shielding function; combination with the traditional electric heating glass manufacturing process is carried out to prepare a piece of light high-intensity electromagnetic shield glass. On the one hand, the intensity reduction caused by preparing a low-resistance transparent conductive film on a piece of load-bearing glass is avoided; and on the other hand, the conflict between the high shielding performance and the high light transmittance requirement of the traditional electromagnetic shielding glass is eliminated. The prepared electromagnetic shielding glass has the high light transmittance larger than or equal to 75%, the reduced weight withthe surface density less than or equal to 10kg / m<2>, and the high intensity; the total thickness does not exceed 6.0 mm and the shielding performance is larger than o equal to 40 dB(0.3-18 GHz). And the glass is resistant to the impact by a bird with the weight of 1.0kg at the speed less than or equal to 330km / h without any penetration and piece spatter.

The invention particularly relates to a failure-free operation method of a server mainboard memory system. The failure-free operation method of the server mainboard memory system is used for solving the problems that presently when the memory in a server system is in a physical failure, the failure area cannot be shielded in time, the operational stability of the server system is affected seriously and real system stability control cannot be realized. The failure-free operation method of the server mainboard memory system solves the problem that presently the physical failure area in the memory of the server system cannot be shielded in time, can realize the automatic troubleshooting of the server mainboard memory system so as to ensure the automatic failure-free operation and the stability and safety design of the server mainboard memory system, and is of great significance in the operational stability of the server system.

Embodiments of the invention provide an incoming call processing method and device, and a mobile terminal. When incoming call information is monitored, the starting state of a management process of a privacy service system is obtained; when the starting state is a closed state, whether a telephone number corresponding to the incoming call information is a privacy number or not is judged; and when the telephone number corresponding to the incoming call information is the privacy number, the incoming call information is subjected to privacy processing. The problem that incoming calls are shielded or expose real identity information thereof in processing an important privacy incoming call is solved, and the beneficial effect of protecting the user's incoming call information in a more concealed manner is achieved.

The invention provides a composite material which has high thermal conductivity and an electromagnetic shielding function. The composite material is formed by compounding an upper layer material composition and a lower layer material composition through vulcanization, wherein the thickness of the upper layer material composition is 0.02-0.7 millimeters, the thickness of the lower layer material composition is 0.5-6.0 millimeters, the thermal conductivity coefficient of the composite material is 3.0-8.0 watt / meter*degree, and the resistivity of the composite material is smaller than or equal to0.01 ohm*centimeter. The invention further discloses a preparation method of the composite material which has high thermal conductivity and the electromagnetic shielding function. According to the composite material, not only can thermal conductivity and electromagnetic shielding be guaranteed, but also the compositions are made to have high mechanical strength, the thermal conductivity coefficient of the obtained composite material is higher than that, which is 0.2 watt / meter*degree, of normal materials, and the resistivity of the obtained composite material is smaller than or equal to 0.01ohm*centimeter so that application in a laser television can be fully achieved; moreover, by means of the composite material, the requirements of a thermal conductivity, shielding and elastic thermalconductivity interface material in conditions sensitive to organosilicone can be met, so that the requirements of heat dissipation and signal stabilization of a product are met.

The invention relates to the field of materials, in particular to a high strength and wear resistant aromatic composite material, a preparation method and application thereof. The composite material includes: 65-85 parts of an aromatic polymer, 5-20 parts of ceramic filler and 10-30 parts of fiber. According to the invention, polyether ketone, polyether sulfone, polyether ether ketone and other aromatic polymers are adopted as the matrix resin to effectively improve the mechanical properties, thermal stability, corrosion resistance and the like of the product. The adding of the ceramic fillerinto the aromatic polymer matrix not only can improve the thermal conductivity coefficient of the product, but also can improve the product strength, and endows the product with the advantages of wearresistance, high hardness, flame retardance, aging resistance, environmental protection, etc. The high strength and wear resistant aromatic composite material provided by the invention has the characteristics of convenient shaping, simplicity and high efficiency, can achieve one-time shaping, and also can be used for secondary processing. The product has high degree of design freedom, is suitablefor large-scale production, and well solves the problems of low strength, poor hardness, no flame retardance, signal shielding and the like of the shells and shell components in existing electronic products, wearable equipment or household appliances.

The invention provides a four-roller connection-rod vacuum electron beam wire feeder, relates to a vacuum electron beam wire feeder, and belongs to the field of the welding machinery. The invention aims to solve the problems of the existing vacuum electron beam wire feeder that wire feeding rollers and wire pressing rollers are easily worn, the distance between the wire feeding rollers and the wire pressing rollers can not be automatically adjusted according to the diameter of welding wires, etc. The main structure of the four-roller connection-rod vacuum electron beam wire feeder comprises a servo motor, two wire feeding rollers, two wire pressing rollers, a connection rod, a U-shaped groove and spring limit mechanisms, wherein, one wire feeding roller is fixed on the rotating shaft of the servo motor, the wire feeding roller rotates as the motor rotates, power is supplied for the other wire feeding roller through the connection rod; the two wire pressing rollers are fixed on a support through studs and nuts; the four rollers are coplanar; the two wire pressing rollers supply pressing forces for the wire feeding operation; and the four rollers and the connection rod jointly form the four-roller connection-rod vacuum electron beam wire feeder. The four-roller connection-rod vacuum electron beam wire feeder provided by the invention is mainly applied in the fields such as dissimilar material vacuum electron beam welding, self-forming technology, material surface cladding, efficient optimization of the performances of welding seams, defect control and the like.

The invention discloses a manufacturing method of an electronic product shell. The manufacturing method comprises the following steps: (1) baking conductive plastic particles and non-conductive plastic particles; (2) forming a main body of the conductive plastic particles in a first die A; (3) rotating the main body formed in the step (2) for 180 degrees by utilizing a movable die plate of a double-colored plastic injection machine, and forming the non-conductive plastic particles for the second time in a second die B after closing; and (4) taking out a formed plastic piece, and then performing burr processing. According to the manufacturing method, the main body made of carbon fiber achieves the conducting effect. Compared with common plastic particle EMI (Electro-Magnetic Interference), the plastic particles after metal aftertreatment have the advantages that the manufacturing procedure is reduced, and the environmental pollution is reduced; the wire part is made of the non-conductive plastic particles, so that the shielding effect caused by integral conduction is eliminated, the integral effect of the shell is increased, post process treatment is facilitated and the product diversification is increased.

The present invention relates to a high-strength low-thermal-expansion AlN nano-wire and an Al composite material. On the basis of AlN nano-wire with a purity of more than 95%, a high-density AlN nano-wire / Al composite material is prepared by melting point hotpressing method, Al nano-grains are prepared by H2 by arc discharge method; with Al, AlCl3, Al2O3 and NH3 as the reactants, AlN nano-fiber at gram level is deposited on a quartz substrate by gas phase CVD method, which is a monocrystalline AlN nano-wire with a purity of 95%, the diameter is between 10nm and 50nm, 1-15% by volume of AlN nano-wire and Al nano-grains are uniformly mixed, the dried mixing powder is hotpressed into a block. AlN nano-wire is evenly dispersed in a matrix, the interface is well bonded, AlN nano-wire is an idea intensifier for optimizing the force property and thermophysical property of metal-matrix electronic composite material, the AlN nano-wire and Al composite material are hopeful to be high-strength low-thermal-expansion new electronic packaging material.

The invention discloses a combined power cover plate and a preparation method thereof. The combined power cover plate is obtained by performing injection molding on a conductive plastic piece with electromagnetic shielding performance into a common plastic piece with impact toughness in an embedded manner. According to the combined power cover plate, the cover plate strength is supplied through the common plastic piece, and the conductive plastic piece can supply shielding performance to the cover plate; furthermore, the common plastic piece and the conductive plastic piece are embedded to form the combined power cover plate through intramode injection molding or double-color injection molding forming technology, so that the problem that the conventional power cover plate cannot have the impact toughness and the shielding performance can be solved; therefore, the power cover plate disclosed by the invention is extremely high in shielding performance and excellent in impact toughness.

The invention relates to a floating rectangular electric connector, which comprises a plug, a socket and a conductive sealing gasket, and is characterized in that the mounting hole of the conductive sealing gasket is a through hole in the stretching section of a floating sleeve of the plug, and the diameter of the mounting hole is equal to the outer diameter of the shaft shoulder of the floating sleeve; the minimum width of the stretching section of the floating sleeve is delta 18 percent; the maximum width of the stretching section of the floating sleeve is delta 15 percent; delta 18 percent is the thickness of the conductive sealing gasket which is compressed by 18 percent; and delta 15 percent is the thickness of the conductive sealing gasket which is compressed by 15 percent. The floating rectangular electric connector can be applied to the field of military and civil products having requirements on the electromagnetic shielding performance and floating of plug-ins.

The invention discloses a method and a device for controlling a sound source webpage and belongs to the network communication field. The method comprises the steps of obtaining the webpage information of a sound source webpage loaded in a browser, determining whether the webpage address of the sound source webpage is in a preset white list, if the webpage address of the sound source webpage is not in the preset white list, generating a prompting message and displaying on a client of the browser, and when an operation of clicking on the prompting message by a user is obtained, displaying the webpage information of the sound source webpage and a control icon of the sound source webpage in a sound source management interface so that the user can control the audio of the sound source webpage through the control icon, wherein the webpage information comprises the webpage address of the sound source webpage. The method and the device solve the problems of complex operation and high professional requirements of controlling the audio of the sound source webpage at present and the problem of unachievable accurate control due to that the audios of all sound source webpages are refused, and as a result, a low-interference, visual and smooth interaction way for solving multi-sound source interference of webpages is provided for the users.

The invention discloses a box-type substation box. The box-type substation box comprises a foamed aluminum base, a foamed aluminum box body arranged on the foamed aluminum base, a metal plate shell arranged outside the foamed aluminum box body, and a metal plate top arranged at the upper part of the foamed aluminum box body, wherein the foamed aluminum base, the foamed aluminum box body and the metal plate top form a cavity. According to the invention, the shielding effect of the box body structure of the box-type substation box on electromagnetic radiation and electromagnetic and mechanical noise is improved.

The invention is a microwave filter tri-cavity package screening box and its producing method, installing two plug-type filter active screening barriers on the base of a filter box, and the box base is uniformly separated y the two barriers into three-cavity package screening box; a superconductive material layer and a gold-plated layer at the bottom of filter working piece are terminated at the end of medium filter screening cavity body; it is composed of the following procedures: 1. fixedly welding the filter working piece in the cavity of filter base; 2. welding two standard SMA connectors of the filter working piece;3. fixing two active screening barriers in locating sockets of the box base to form screening cavity closed around filter soldered dots; 4. installing a box cover on the box base. The advantages of the invention: adopting a structure with three independent isolating screening cavities, forming two screening cavities in two input-output soldered dots of the filter, reducing the bad effect of the filter soldered dots on the filter performance, and increasing product yield.

The invention discloses a mechanical and electromagnetic response synchronous test system and method for dynamic fracture of a brittle material. The system comprises a Hopkinson rod loading subsystem,a load displacement testing subsystem, a sample subsystem, an antenna testing subsystem and an electromagnetic shielding subsystem, wherein the surface of the sample is attached with an electrode anda strain gauge. The method comprises the following steps of establishing connection and performing electromagnetic shielding; carrying out launching impact and triggering an oscilloscope, outputtingan incident wave, a transmission wave and a reflected wave waveform graph by the oscilloscope, calculating a load, a displacement and a loading rate; outputting a strain curve of the sample by the oscilloscope, and outputting a surface charge curve determined by a sample electrode; outputting an electromagnetic radiation oscillogram of an electromagnetic receiving antenna and an electric receivingantenna by the oscilloscope; and determining the mechanical and electromagnetic response time sequence at the arrival moment, fracture starting moment and ending moment of stress wave, and calculating the crack expansion speed. According to the system and method, the mechanical and electromagnetic response characteristics of the brittle material can be synchronously tested, and the dynamic fracture mechanics and electromagnetic response characteristics of the brittle material can be accurately studied.

The invention relates to a sailor area positioning and management system based on active label bracelet, and a method thereof. The system comprises: the active label bracelet having a label ID and used for collecting vital sign information of a sailor and environmental information; a positioning base station having a base station ID, wherein the positioning base station and the active tag braceletserve as nodes to form a ZigBee network, and the positioning base station receives the label ID, the vital sign information of the sailor and the environmental information through the ZigBee network;a gateway, wherein the gateway performs power line communication with the positioning base station to obtain the base station ID, the label ID, the vital sign information of the sailor and the environmental information; an upper computer server connected with the gateway and used for receiving the base station ID, the label ID, the vital sign information of the sailor and the environmental information so as to monitor the vital signs of the sailor and the environmental information, and perform sailor positioning and attendance; and a bulletin board, wherein the upper computer server also sends announcement information to the gateway, and the bulletin board performs power line communication with the gateway to obtain the announcement information and to publish the information.

The invention discloses a black water-based full-shading electromagnetic wave shielding coating which is coated on a conductive substrate and comprises the following components in percentage by mass: 1-20% of polyurethane-acrylic copolymer, 1-20% of acrylic emulsion, 15-35% of nano black paste, 5-10% of polytetrafluoroethylene wax dispersion, 1-1.5% of wetting dispersant, 0.1-1% of flatting agent, 5-10% of coalescing agent, 0.5-1% of thickening agent and the balance of water. The coating has the advantages of being low in light transmittance, good in after-tack resistance, high in electromagnetic wave shielding performance and the like, is applied to various electromagnetic compatibility environments, such as the fields of communication, IT, electric power, medical treatment, electronics, military industry, new energy automobiles and the like, and prevents electromagnetic information leakage and electromagnetic radiation pollution; normal work of instruments and equipment is effectively guaranteed, safety of confidential information is guaranteed, body health of workers is guaranteed, and the problems that in the prior art, paint is high in light transmittance and poor in shielding effectiveness are solved.

The invention provides a video processing method and device. The method comprises the steps of obtaining a to-be-played video, and judging whether a preset object exists in a current video viewer or not; if the preset object exists in the current video viewer, determining a video frame in the to-be-played video, the video frame in the to-be-played video being an image that the preset object is notsuitable for watching; and processing video frames in the to-be-played video to obtain a target played video, the target played video being a video suitable for being watched by the preset object. According to the method and the device, the limit-level content in the to-be-played video is processed, so that the video suitable for watching can be provided for the preset object.

The invention provides a three-dimensional structured micropore material. The three-dimensional structured micropore material adopts a three-dimensional net-shaped structure entirely; magnetic conductive microsphere powder is arranged in X, Y and Z directions in a magnetic control mode; the surface of the magnetic conductive microsphere powder is coated and loaded with magnetic conductive nanotubes; the gaps of the magnetic conductive microsphere powder are filled with magnetic conductive nanotubes; the overall surface is electrically deposited with a metal layer; and the micropores are 1-100nm in pore diameters and 0.1-5[mu]m in overall thickness. Meanwhile, the invention also provides a preparation method for the three-dimensional structured micropore material. The preparation method is simple in process and low in manufacturing cost; and the prepared material has creative structure, relatively uniform and ordered crystal structure arrangement, relative high material consistency, high space heat conduction and impact resistance of the material and the like.

The invention discloses a printed circuit board, a mobile terminal, a mobile terminal shielding frame and a preparation method therefor, and aims to solve the problem that the shielding frame in the prior art cannot shield interference signals of a mobile phone main board CPU and a power supply. For fulfilling the purpose, the invention provides the mobile terminal shielding frame, wherein side walls are arranged around the mobile terminal shielding frame; the side walls form welding legs; and the welding pins are provided with outwardly-bent bending legs.

The invention relates to a composite material. The composite material comprises magnetic wave-absorbing powder, a polymer matrix and a mixture of carbon-based fibers or metal fibers, wherein the composite material is a fiber-oriented composite material. The invention further relates to a preparation method and application of the composite material. The composite material has the functions of low lap joint impedance, heat dissipation and electromagnetic shielding.

The invention discloses a high-voltage test hall shielding curtain. The high-voltage test hall shielding curtain comprises a mounting carrier, a flexible winding drum, a power mechanism, two locatingstructures and a hall grade level, wherein the mounting carrier is installed on a ceiling, and a suspension support is arranged at the lower end of the mounting carrier; the flexible winding drum is arranged on the suspension support, a winding shaft is arranged in the flexible winding drum, a shielding soft curtain layer is wound on the winding shaft; the power mechanism is arranged on the mounting carrier and is connected with the winding shaft; the two locating structures are arranged at the lower end of the winding shaft in up-down parallel positional relation; and the hall grade level isarranged at the lower end of the winding shaft. By virtue of the way, the high-voltage test hall shielding curtain disclosed by the invention has the advantages that the problem of shielding effect ofan alternating current test area and a direct current test area is solved, and the influence of one area on the other area is obviously reduced when tests are carried out in the alternating current test area and the direct current test area at the same time.

The invention relates to a novel power semiconductor device, especially relates to a metal housing used for a semiconductor power device. A bottom part of a steel housing is provided with a tungsten copper bottom plate, one end of which is extended out of the steel housing, and the extended part is provided with a through hole. In the steel housing, the tungsten copper bottom plate is provided with a beryllium oxide sheet, which is provided with a molybdenum sheet. The steel housing is provided with three sealing holes, in which are disposed leads, and the leads and the sealing holes are connected together by insulators. The two ends of each lead are respectively an inner end and an outer end, and the outer end is disposed on the outer part of the steel housing, and the inner end is disposed in the steel housing, and in addition, the inner end adopts a flat structure, and the width of the inner end is greater than the diameter of the corresponding sealing hole. The inner end of one of the leads is provided with a connecting hole, in which is fixedly disposed a binding post, and the binding post is connected with the molybdenum sheet. The performance of the housing is enhanced, and the metal housing is suitable for the packaging of the large-current, high-power, high-back pressure high heat conduction semiconductor devices.

The box consists of box cover, metal box base and filter operation sheet welded on support frame of box base in suspension mode based on bottom. It is formed as the follows: air vent is set on box base and support frame of filter operation sheet is placed at central part of box base, fixing screw hole and inlet as well as outlet of two symmetric SMA connectors are set at a pair of opposite edge on box base, gold plated layer is at bottom of filter operation sheet and the operation sheet is welded on support frame at box base centre of shielded box with gold plated layer according to welding layers.