67 results about "Microwave electronics" patented technology

A compact, agile polarization diversity, multiple frequency band antenna with integrated electronics for terrestrial terminal use in satellite communications systems is disclosed. The antenna includes an antenna feed having highly integrated microwave electronics that are mechanically and electromagnetically coupled thereto in a distributed arrangement so that diverse polarization senses having a low axial ratio and electronic switching control of the polarization senses is provided. The arrangement of the integrated distributed transceiver configuration enables the mechanical rotation of the orientation of a first transceiver for skew alignment while a second transceiver remains stationary relative to the antenna feed assembly. The first transceiver can be a high-band transmitter and receiver pair that supports linear polarization senses and the second transceiver can be a low-band transmitter and receiver pair that supports circular polarization senses. The antenna system presented is highly compact and offers improved polarization performance previously achievable by only larger devices.

A compact, agile polarization diversity, multiband antenna with integrated electronics for satellite communications antenna systems is disclosed. The antenna includes a feed assembly having integrated microwave electronics that are mechanically and electromagnetically coupled thereto in a distributed arrangement so that diverse polarization senses having a low axial ratio and electronic switching control is provided. The microwave electronics include a distributed transmitter that can include high-band and low-band transceivers. The high-band and low-band transceivers can include high-band and low-band transmitter and receiver pairs, respectively. The antenna presented enables the mechanical rotation of the orientation of the high-band transceiver for skew alignment while the low-band transceiver remains stationary relative to the antenna assembly. The low-band transmitter and receiver pair can include planar interfaces electromagnetically coupled to the feed assembly between a main reflector and subreflector via OMTs. The highly compact antenna system presented offers polarization performance previously achievable by only larger devices.

Apparatus for measuring the distribution of strain and temperature along an optical fibre (34) by analysing the distribution of the Rayleigh scattering and stimulated Brillouin scattering wavelength shifts along the length of a sensing fibre (34) using a Wavelength-Scanning Optical Frequency-Domain Analysis (WS-BOFDA) technique in which a wavelength-swept laser (12) sources a Brillouin “pump” radiation and excites a Brillouin ring laser (14) that sources a Brillouin “stimulus” radiation with wavelength shifted with respect to the excitation of a tuneable quantity. One optical Mach Zehnder or Michelson interferometer (27) is excited by the “stimulus” radiation on both the measurement arm, that comprises the sensing fibre (34), and the reference arm (38) while the “pump” radiation is injected only in the measurement arm by a controllable inhibition system (57). The output of the interferometer (27) is analysed in the frequency domain differential detectors (73, 74) sweeping the wavelength of the pump laser (12) and of the wavelength shift of the Brillouin laser (14). The invented apparatus does not require electro-optical modulators, phase-locking, high power optical amplifiers or microwave electronics and overcomes the prior art issues on manufacturing cost, stability, spatial resolution and on separate measurement of strain and temperature on the same sensor.

The invention provides a method for manufacturing helix line slow-wave system of wide frequency band traveling wave tube which belongs to the microwave electronics device field. The system comprises the helix line coiling forming, the media clamp rod and a metal load assembly fixed in a metal load longitudinal groove. The system is assembled according with steps as follows: a. fixing the helix line, three metal load assembling pieces and three technique core rods for assembling into an assembly component on two ends by a locating clamp; b. inserting the assembly component into a small segment metal pipe case for assembling; c. moving the small segment metal pipe case, filling the assembly component into a total metal pipe case along a metal pipe case conducting channel, then removing the small segment metal pipe case. The method can increase manufacturing precision (tolerance 3-5 mum) of aperture between the helix line and the load component greatly, has little manufacturing labour amount, increases radiation ability of the whole slow-wave system, reduces crispness pressure of the clamp rod and reduces mortality of accessory.

The invention provides an effective radiator structure of millimeter wave traveling wave tube slow-wave system with wide frequency band and a realizing method thereof which belong to the microwave electronics device field. The structure includes a media clamp rod contacted tightly by a helical line slow-wave structure through the surrounding, and a heat conducting channel composed by the outmost layer pipe case, sawtooth containing sector surface arranges on longitudinal direction of the medium clamp rod, each sawtooth periphery increases a load patch layer contacted with the sawtooth for increasing contact area, a heat conducting compound metal film is plated on a surface between the load patch and the media clamp rod; a heat conducting copper film is plated on a contact surface between the load patch and the pipe case. The realizing method includes flow step operation as follows: A selects the load patch, B selects the media clamp rod. The method can improve heat stability of millimeter wave slow-wave system; uses the clamp rod with less section size, reduces high-frequency consumption in the slow-wave system design and increases the radiator ability.

The invention discloses a device for increasing the output power of a microstrip type short-rise-time double-exponential pulse source and relates to the technical field of microwave electronics. The device for increasing the output power of the microstrip type short-rise-time double-exponential pulse source comprises a synchronous trigger circuit, a first pulse source, a second pulse source and a power combiner. The output end of the synchrotrons trigger circuit is connected with the input end of the first pulse source and the input end of the second pulse source. The power combiner is a substrate provided with two signal transmission lines. The two signal transmission lines are two identical microstrip lines which are symmetrically arranged on the substrate. The two microstrip lines share the same input end. The first pulse source and the second pulse source are arranged on the substrate. The output end of the first pulse source and the output end of the second pulse source are connected with the respective input ends of the two microstrip lines. The impedance of the output end shared by the two microstrip lines is matched with that of the corresponding pulse source. Each microstrip line is composed of multiple line branches which are connected with one another in an end-to-end mode from the input end to the output end, wherein the impedances of the line branches become larger successively. An isolation resistor is further arranged between the two microstrip lines. By the adoption of the device for increasing the output power of the microstrip type short-rise-time double-exponential pulse source, high-isolation high-efficiency low-reflection combination of two combined signal lines is achieved.

The invention relates to a production method of a ceramic filling type hydrocarbon resin copper-clad plate. The production method comprises the following steps: carrying out surface treatment on a ceramic filler by using a silane coupling agent; weighing the surface-treated ceramic filler, hydrocarbon resin and a curing agent in proportion, adding a proper amount of solvent to adjust the viscosity, and fully mixing by using a mixing device; defoaming the mixed slurry by using a slurry defoaming device; performing silk-screen printing on the de-foamed slurry on the surface of a copper foil, performing low-temperature drying after printing is completed, repeating the silk-screen printing process for multiple times until the required thickness is reached, and covering the surface with the copper foil; and carrying out hot pressed sintering on the two-sided copper foil-coated plate to prepare the ceramic filling type hydrocarbon resin copper-clad plate. The problem that an existing carbon-hydrogen resin copper-clad plate filled with glass fiber cloth inorganic ceramic powder has electrical property difference in the X direction and the Y direction is solved. The ceramic filling type hydrocarbon resin copper-clad plate is widely applied to the modern microwave electronic communication field of high-end electronic products such as microwave communication, active phased array radars, unmanned vehicle-mounted radars and the like.

The invention relates to a hydrocarbon resin ceramic bonding sheet and a batch production process thereof. The hydrocarbon resin ceramic bonding sheet comprises the following components: an inorganic filler, a silane coupling agent, hydrocarbon resin, a curing agent and a solvent. The mass production process comprises the following steps: carrying out surface modification treatment on an inorganic filler by using a silane coupling agent; mixing the surface-modified porcelain powder with a curing agent, hydrocarbon resin, a solvent and other materials, and carrying out planetary ball milling; carrying out tape casting on the mixed solution subjected to planetary ball milling to prepare a raw ceramic tape; and semi-curing and demolding the green tape in a vacuum high-temperature oven to prepare the bonding sheet. The problems that an existing ceramic filled hydrocarbon resin type bonding sheet is poor in thickness uniformity, long in production period and not suitable for batch production are solved. The hydrocarbon resin ceramic bonding sheet is widely applied to modern microwave electronic communication fields such as spaceflight electronic equipment, communication, a Beidou system, a wireless local area network and the Internet of Things.

The invention discloses a design method of a strip beam traveling wave tube slow wave structure working in a high-order mode, and relates to the technical field of microwave electronics and terahertz.The design method has the advantages that the strip beam traveling wave tube is enabled to successfully work in a high-order mode, limitation of cut-off frequency on the width of an electron channelis eliminated, the advantage of large width of strip beam electrons is brought into full play, and the power capacity of the strip beam traveling wave tube is greatly increased. Meanwhile, due to thefact that the size is enlarged, the machining and assembling difficulty is further reduced, a device can work under the large voltage, the interaction impedance is improved, and the electron beam andelectromagnetic wave transduction efficiency is improved. Compared with a traveling wave tube with a circular section electron beam in a traditional working mode, the power capacity is improved by oneorder of magnitude.

The invention discloses a device for extracting a chip, which belongs to the technical field of microwave electronic products. It comprises a housing and first and second pulling pins arranged on both sides of the housing. The inside of the housing is provided with a gear and a first rack. and the second rack, the first rack and the second rack are respectively located on the upper and lower sides of the gear and are both engaged with the gear. There is a rotating rod on the front of the housing. One end of the rotating rod extends out of the housing, and the other end is fixedly connected to the gear. ; The outer end of the first rack protrudes from the shell and is connected with the first pin, and the outer end of the second rack protrudes from the shell and is connected with the second pin. The extractor can be used for extracting microwave electronic products with different lengths and sizes, and the force is uniform, which avoids the bending or breaking of pins during extraction.

The invention discloses multiphase microwave dielectric ceramic and a cold sintering preparation method thereof, belonging to the technical field of electronic ceramic. The preparation method comprises the following steps: introducing Li<2>MoO<4> which is easily dissolved in water and serves as a sintering aid and the organic matter PTFE which serves as a positive temperature coefficient regulator into a (Ca<0.65>Bi<0.35>)(Mo<0.65>V<0.35>)O4 system, and then preparing the complex-phase microwave dielectric ceramic at 150 DEG C and 300 MPa by using a cold sintering method. The complex-phase microwave dielectric ceramic has a low dielectric constant and a near-zero temperature coefficient of resonance frequency, and has a wide application prospect in microwave electronic components such as microwave dielectric substrates and resonators.

The invention relates to the technical field of microwave electronic equipment interconnection, and discloses a single-support medium coaxial adapter with capacitive compensation. The single-support medium coaxial adapter is characterized by comprising an SMA jack shell (1), an SMPM pin shell (2) and a stub assembly, the stub assembly comprises an inner stub (3) and an insulation support medium (4) which are coaxially arranged, the insulation support medium (4) is fixed on the outer peripheral surface of the inner plug (3), the plug assembly is inserted into the SMA jack shell (1) from one endfar away from the insulation support medium (4), a first step structure (11) is arranged in the SMA jack shell (1), a second step structure (21) is arranged in the SMPM pin shell (2), and when the SMA jack shell (1) and the SMPM pin shell (2) are in an inserted state, the SMPM pin shell (2) and the SMA jack shell (1) are connected through threads, and the two ends of the insulation supporting medium (4) abut against the first step structure (11) and the second step structure (21) respectively.

The invention discloses a high thermal conductivity microwave attenuation AlN-based composite material and a preparation method thereof, belonging to the field of microwave electronics vacuum technology. According to the high thermal conductivity microwave attenuation AlN-based composite material, (0.1-2.0)vol.% of CNTs (Carbon Nano Tubes) and (1.0-20.0)vol.% of W which are used as metal phases and (100-CNTs-W)vol.% of AlN which is used as a medium phase are used. The preparation method comprises the steps of: mixing the CNTs, the W powder and the AlN powder according to a certain volume ratio to obtain a mixture; and forming and sintering the mixture to obtain a CNTs / W / AlN complex phase microwave absorbing material. The high thermal conductivity microwave attenuation AlN-based composite material has relative density being more than 98 percent, dielectric constant being 17-25 and dielectric loss angle tangent being more than 0.04, has excellent wave absorbing property within a range of 70kHz-1MHz, is especially applicable to preparation of a microwave electric vacuum device, and can be applied to a passive electronic countermeasure and microwave measurement system.

The invention discloses a preparation method of a high-dielectric low-loss high-frequency microwave composite dielectric substrate, and belongs to the field of microwave electronic component ceramic materials, wherein the preparation method comprises the following steps: preparing CaTiO3 and Li0.5Sm0.5TiO3 according to a molar ratio to form CLST ceramic powder; ball-milling the ceramic powder; sintering at high temperature; carrying out surface treatment on the ceramic powder by using a silane coupling agent; proportioning the ceramic powder subjected to surface treatment and polytetrafluoroethylene emulsion; adding a demulsifier for demulsification; standing and filtering to form composite dough; carrying out calendering molding or compression molding; and carrying out hot pressed sintering on a molded green body coated with copper foils on two surfaces to form the high-dielectric low-loss high-frequency microwave composite dielectric substrate. The problems that an existing microwave dielectric ceramic material is low in dielectric constant, large in loss, large in temperature coefficient of resonance frequency and free of continuous batch production capacity are solved. The substrate is widely applied to the modern microwave electronic communication fields of spaceflight electronic equipment circuit boards, satellite communication, Beidou systems and the like.

The invention discloses a low-dielectric low-high-frequency-loss LTCC material and a preparation method thereof. The LTCC material comprises the components including borosilicate glass and calcium borosilicate glass; according to the mass percentage, the proportion of the borosilicate glass is 5%-20%, and the proportion of the calcium borosilicate glass is 80%-95%; the borosilicate glass comprises the following components in percentage by weight: 20%-50% of B2O3, 50%-85% of SiO2 and 1%-5% of alkali metal oxide, and the calcium borosilicate glass comprises the following components in percentage by weight: 30%-50% of CaO, 15%-40% of B2O3 and 20%-50% of SiO2. The required ceramic substrate is obtained through the steps of raw material mixing, glass powder smelting, glass cold quenching, crushing and grinding to form glass powder, glass powder mixing, glass powder passivating treatment, tape casting slurry preparation, tape casting, sintering and the like. The problems that dielectric constant and high frequency of an existing LTCC ceramic material of a glass ceramic system are unstable, and high-frequency loss is high are solved. The material is widely applied to the field of microwave electronic communication.

The invention belongs to the field of microwave electronic ceramic materials and its manufacture, in particular to a Mg 2 SiO 4 -Li 2 TiO 3 Composite system LTCC material and its preparation method. The LTCC material provided by the invention is based on Mg 2 SiO 4 and Li 2 TiO 3 Composite system, obtained by solid phase method; achieve sintering temperature of 800-950°C lower than 960°C (Ag melting point), ε r =9.0~18.0, and has a high Qf value of 50,000~250,000GHz and near zero τ f =‑15~15ppm / ℃, it has high application prospect and value in the field of LTCC technology. It can be widely used in LTCC substrates, laminated microwave devices and modules.

The invention belongs to the technical field of integrated circuit manufacturing, and particularly relates to a microwave-assisted atomic layer deposition method and reactor. The atomic layer deposition reactor comprises a reaction chamber, a microwave source, a vacuum pump and gas pipelines, wherein the top of the reaction chamber is provided with a quartz window, a substrate tray is arranged inside the reaction chamber, the side wall of the reaction chamber is provided with a magnet exciting coil, the microwave source is arranged above the quartz window, the vacuum pump is used for adjustingthe vacuum degree of the reaction chamber, the gas pipelines comprise a first reaction source gas conveying pipeline, a second reaction source gas conveying pipeline and an inert gas pipeline which are used for conveying a first reaction source, a second reaction source and inert gas respectively, the microwave source carries out microwave irradiation decomposition on the first reaction source, the microwave source and the magnet exciting coil jointly generate a microwave electron cyclotron resonance source, and the second reaction source is excited to form high-energy plasmas. According to the microwave-assisted atomic layer deposition method and reactor, the conductivity and ductility of a thin film can be effectively improved, an ideal step coverage rate and the accurate thin film thickness control capability are achieved, and the requirements of an advanced CMOS integrated circuit process can be met.

The invention provides an aluminum waveguide anti-corrosion treatment method. The micro-arc oxidation treatment is applied to aluminum waveguide, the requirement for microwave transmission performancecan be met, and meanwhile the requirement for anti-corrosion performance is met. By means of the method, the micro-arc oxidation treatment is performed on the whole aluminum waveguide, after the treatment, the thickness of an insulating oxidation film is 18-23 [mu]m. The insulating oxidation film treatment is performed on the aluminum waveguide, and compared with anti-corrosion surface treatmentof conventional aluminum waveguide, the anti-corrosion performance of the aluminum waveguide is quite excellent. Through electrical property tests, the requirements of a high-power aluminum waveguidemicrowave transmission technology are met, and the technology can be widely applied to microwave electronic equipment running in outdoor marine harsh climate environments for a long time.

The invention relates to a high-strength LTCC glass ceramic material and a preparation method thereof, the LTCC glass ceramic material comprises the following components in percentage by mass: lead borosilicate glass and aluminum oxide, the weight of the lead borosilicate glass is 2%-10% of that of the aluminum oxide, and the lead borosilicate glass comprises the following components in percentage by mass: 10%-40% of PbO, 2%-15% of B2O3, 50%-85% of SiO2, 2%-15% of CaO, 0.5%-5% of Al2O3 and 1%-5% of alkali metal oxide; and the aluminum oxide is alpha-Al2O3. The high-strength LTCC glass ceramic substrate is obtained through the steps of raw material preparation, raw material mixing, glass powder smelting, glass cold quenching, crushing and grinding, aluminum oxide powder glass modification, modified aluminum oxide powder preparation, glass-ceramic mixing, tape casting slurry preparation, tape casting, sintering and the like. The problem that existing glass ceramic is not high in strength is solved. The material is widely applied to the field of microwave electronic communication.

The invention discloses a high-order backward wave oscillation suppression structure for a strip beam traveling wave tube, and belongs to the technical field of microwave electronics and terahertz. The structure comprises a shell and rectangular gates arranged on the upper top face and the lower bottom face of an inner cavity of the shell in a staggered mode, the two side faces of the shell are each provided with a column of rectangular coupling waveguides which are the same in size and arranged periodically, and the two columns of rectangular coupling waveguides are staggered by half a slow wave period in the axis direction and are also designed in a staggered mode in the longitudinal direction. And one rectangular coupling waveguide corresponds to one rectangular cavity. By loading the staggered rectangular coupling waveguides on the two sides of the slow-wave structure, suppression and absorption of a high-order mode are synchronously realized on the premise of not influencing and not damaging a working mode.

The present invention relates to the production of highly efficient films for field-effect electron emitters, wherein said films may be used in the production of flat displays, in electronic microscopes, in microwave electronics, in light sources as well as in various other applications. This invention more precisely relates to a cold cathode that comprises a substrate having a carbon film applied thereto. The carbon film has an irregular structure consisting of carbon micro-ridges and / or micro-threads which are perpendicular to the surface of the substrate, have a size ranging typically from 0.01 to 1 microns and a distribution density of between 0.1 and 10 mum2. This invention also relates to method for producing a cold electrode, wherein said method comprises generating a DC current discharge in a mixture comprising hydrogen and a carbon-containing additive, and further depositing the carbon phase on the substrate located at the anode. This method is characterized in that the discharge is generated at a current density of between 0.15 and 0.5 A / cm2. The deposition process is carried out in a mixture containing hydrogen and vapors of ethylic alcohol or methane, under an overall pressure of between 50 and 300 Torrs and at a substrate temperature of between 600 and 900° C. The concentration of ethylic alcohol vapors ranges from 5 to 10% while that of methane vapors ranges from 15 to 30%. This invention also relates to another method for producing a cold cathode, wherein said method comprises generating a microwave discharge at an absorbed power of between 100 and 1000 W. This discharge is generated in a mixture containing gaseous carbon oxide as well as methane in an 0.8-1.2 concentration and under a pressure of between 10 and 200 Torrs, the carbon phase being further deposited on the substrate. This method is characterized in that the deposition process is carried out at a temperature on the substrate surface that ranges from 500 to 700° C.

The invention provides an external device and method for improving microwave network measurement and calibration precision. The device comprises a control circuit, a calibration data storage unit, a temperature detection circuit, a directional coupling bridge unit, a broadband microwave electronic synchronous switch unit and an automatic single-port electronic calibration unit. The control circuitand the calibration data storage unit are respectively connected with the temperature detection circuit, the broadband microwave electronic synchronous switch unit and the automatic single-port electronic calibration unit. The directional coupling bridge unit is connected with the broadband microwave electronic synchronous switch unit, and the broadband microwave electronic synchronous switch unit is connected with the automatic single-port electronic calibration unit and the test port. Measurement errors caused by factors such as temperature drift and repeated connection of test cables or other intermediate equipment forming a test channel in the test process of the vector network analyzer can be eliminated or reduced in real time according to measurement requirements, and the device andthe method are an effective means for improving the measurement precision of the vector network analyzer.

The invention relates to a microwave output transition for a high-power electron tube comprising a body (78) of tubular shape, along a longitudinal axis ZZ′, having two ends (80, 90), a passage (79) between the two ends that has internal surfaces for propagating electromagnetic waves, one of the ends (90), in the form of a circular cylindrical tube, comprising a conical internal propagation surface (130) and the other end (80), in the form of a tube of rectangular cross section, having two long sides (84, 85) and two short sides (86, 87) perpendicular to the long sides, the passage having two plane internal propagation surfaces (120, 122) parallel to the long sides (84, 85) and two other plane internal surfaces (124, 126) parallel to the short sides (86, 87).Each of the plane internal propagation surfaces (120, 122) parallel to the long sides (84, 85) is joined to the conical internal propagation surface (130) via a respective curved connecting surface (132, 133) having bidirectional radii of curvature.

The invention provides a silicon-based three-dimensional integrated frequency conversion channel, and relates to the technical field of microwave electronics. The invention discloses a silicon-based three-dimensional integrated frequency conversion channel which comprises a multi-way switch filter module and a frequency conversion receiving and transmitting module. Wherein the multi-way switch filter module comprises a first single-pole multi-throw switch, a filter bank and a second single-pole multi-throw switch which are connected in sequence. The frequency conversion transmit-receive module comprises a primary frequency conversion transmit-receive unit and a secondary frequency conversion transmit-receive unit. The primary frequency conversion transmit-receive unit is connected with the first single-pole multi-throw switch, and the secondary frequency conversion transmit-receive unit is connected with the second single-pole multi-throw switch. By adopting the scheme of combining the two-stage frequency conversion structure and the multi-path switch filter bank, the broadband frequency conversion and better cross modulation suppression and spurious suppression effects are realized more easily, and the spurious suppression performance of the frequency conversion channel is improved.

The system and method for a conformal millimeter wave (mmW) cavity backed slot antenna with near positive gain and hemispherical gain coverage. The antenna has a microstrip launch and feed and a surface mount connector. The mmW antenna may have a stripline launch or waveguide launch instead of a microstrip launch. In some cases, the microwave electronics can be mounted on the launch substrate instead of a connector.

A composite microwave dielectric ceramic and a cold sintering preparation method thereof belong to the technical field of electronic ceramics. Water-soluble Li 2 MoO 4 As a sintering aid, organic PTFE is introduced as a positive temperature coefficient modifier (Ca 0.65 Bi 0.35 )(Mo 0.65 V 0.35 )O 4 system, a composite microwave dielectric ceramic was prepared by cold sintering at 150°C and 300MPa. The complex-phase microwave dielectric ceramic has low dielectric constant and nearly zero temperature coefficient of resonance frequency, and has wide application prospects in microwave electronic components such as microwave dielectric substrates and resonators.

The invention belongs to the technical field of microwave electronic circuits, and discloses a double-gap electromagnetic shielding system, a design method thereof and a microwave circuit. The systemcomprises a first metal plate and a second metal plate; second transverse and longitudinal rectangular grooves are formed in the back surface of the second metal plate, a first air gap is formed between the first metal plate and the second metal plate, and a second air gap is formed between the third metal plate and the second metal plate; the second metal plate is arranged between the first metalplate and the third metal plate; and the first metal plate and the third metal plate are parallel. The depths of the rectangular grooves in the two faces of the second metal plate range from 1% wavelength to 1 / 2 wavelength of the center frequency of the electromagnetic shielding structure. The double-gap electromagnetic shielding structure has the advantages of being compact in structure and small in thickness, and the requirement of a microwave millimeter wave circuit for miniaturization of the double-gap electromagnetic shielding structure is met. The invention can be used for improving theelectric contact performance of the microwave millimeter wave circuit and inhibiting electromagnetic radiation.

The invention discloses a method for improving the uniformity of high-temperature smelted calcium borosilicate glass. The method comprises the following steps: selecting nanoscale silicon dioxide powder, boric acid and calcium carbonate as raw materials; carrying out burning loss test on nano silicon dioxide, carbonic acid and calcium borate to obtain burning loss values of the raw materials; testing the purity of the raw material by using XRF or ICP to obtain the purity value of the raw material; setting a design value of the raw material, and calculating the amount of the raw material needing to be actually added; grinding and mixing boric acid and diboron trioxide by using dry grinding; conducting glass melting by using a high-temperature stirring melting method, heating the glass until the glass is completely melted, and starting stirring, so as to fully homogenize the glass in the melting process; and cooling the molten glass liquid into transparent and uniform glass sheets by using a cooling and rolling process. The invention solves the problem of local non-uniformity of glass components caused by glass phase splitting during high-temperature smelting of the existing calcium borosilicate glass, and improves the performance, quality and reliability of the calcium borosilicate glass. The invention is widely applied to the microwave electronic communication field.

The invention belongs to the technical field of electromagnetic metamaterials and microwave electronic circuits, and discloses a three-dimensional non-contact metal grating type electromagnetic metamaterial system, a design method and a microwave circuit, and the three-dimensional non-contact metal grating type electromagnetic metamaterial system is provided with a first metal grating and a second metal grating, the first metal grids and the second metal grids are stacked in a staggered manner; an air gap is formed between the first metal grating and the second metal grating or a dielectric material is filled between the first metal grating and the second metal grating; the surface of the first metal grid is parallel to the surface of the second metal grid; the section of the metal grating can be but not limited to a rectangle, a parallelogram or a circle; the distribution of the metal grids is periodic or quasi-periodic. The size of the metal grids and the distance between the grids are between one twentieth wavelength and one half wavelength of the center frequency of the electromagnetic shielding material. The three-dimensional non-contact metal grating type electromagnetic shielding metamaterial is a three-dimensional electromagnetic material based on a metal structure, and can meet the application requirements of a low passive intermodulation microwave transceiving system, a reconfigurable microwave millimeter wave device and the like.