105 results about "Microwave substrate" patented technology

An antenna structure is disclosed, which includes: a microwave substrate; and a first circuit, a second circuit, and a ground circuit disposed coplanarly on the microwave substrate. The first circuit is an open loop structure with a discontinuous portion and has a pair of ends, namely a feed point and a ground point, arranged respectively across the discontinuous portion. The ground point is connected to the ground circuit. The second circuit is disposed at the periphery of the first circuit, where the second circuit is connected to a connecting point of the first circuit on one side thereof. Thereby, the antenna structure reduces the SAR. In addition, an electronic device having an antenna structure is disclosed.

The invention discloses an Mg2SiO4 microwave dielectric ceramic with low dielectric constant and a method for preparing the same. The invention obtains a single phase high purity Mg2SiO4 ceramic through controlling the nonstoichiometric ratio of Mg to Si. The method overcomes the defect that the ceramic is easy to generate a second phase after the prior sintering according to the molar ratio of a chemical formula 2MgO.SiO2. The Mg2SiO4 ceramic obtained by the method has a low dielectric constant between 6 and 8, the dielectric loss thereof is less than 10<-5>, and the Qf thereof is more than 160, 000 GHz. The high-quality microwave dielectric ceramic with low dielectric constant is used as a material for manufacturing electronic circuit substrates, dielectric resonators, filters, microwave substrates and microstrip lines, and has important application prospect and great economic value in the fields of electronic circuit, microwave mobile communication, satellite communication and radar system.

There is provided a low-loss microwave dielectric ceramic having a composition represented by xCaO.yLn2O3.zAl2O3.mTiO2 wherein Ln is Nd or Sm, 25.0 mole %≦x≦75.0 mole %, 10.0 mole %≦y≦30.0 mole %, 10.0 mole %≦z≦30.0 mole %, 0.8 mole %≦m≦20.0 mole %, x+y+z+m=100 mole %. It has a dielectric constant in the range from 18 to 25, an extremely large Qf value ranging from 80,000 to 200,000 GHz, and a temperature coefficient of resonant frequency tunable in the vicinity of 0. It can make the applications of dielectric resonators, filters, and antennas extended to higher frequency and larger power; it can also be applied to microwave capacitors, temperature-compensated capacitors, microwave substrates, et al.

The invention discloses a millimeter-wave fan beam cylindrical Luneberg lens antenna based on a metal perturbation structure. The antenna achieves a pitch beam width reaching 104 degree and azimuth plane + / - 60 degree scanning. The antenna comprises a cylindrical Luneberg lens located between an upper metal flat plate (1) and a lower metal flat plate (2); an arc feed source array (3) located on the focal line of the cylindrical Luneberg lens; and the metal perturbation structure (5) arranged on the radiating aperture of the lens circumferentially. The cylindrical Luneberg lens comprises a cylindrical filling dielectric sheet (4). The filling dielectric sheet uses a low-loss microwave substrate as a substrate material and is divided into five layers according to a concentric circle structure from inside to outside. Respective layers have through-holes with different densities. The through-holes are filled with air. The antenna is light in weight and easy to process, greatly increases the pitch surface beam width, realizes a wide beam scanning range in the horizontal plane so as to be better applied to a multi-beam directional communication and beam scanning antenna, especially the millimeter wave high-frequency band and applications requiring axial grouping.

The invention relates to a welding process and a welding mechanism for a microwave substrate and a housing. The process comprises machining a through hole in the microwave substrate, and machining a column on the inner bottom surface of the housing, which corresponds to the through hole, wherein the through hole can be penetrated by the column, the diameter of the through hole is larger than that of the column, and the height of the column is smaller than the thickness of the microwave substrate; forming integrated metalized layers on the surfaces of both the microwave substrate and the housing; placing the microwave substrate, solder blocks and the housing correspondingly and sequentially from top to bottom, performing reflow soldering on the microwave substrate and the housing, and during the reflow soldering process, exerting pressure on the upper surface of the microwave substrate to guarantee fitting of the microwave substrate and the housing. The welding process of the microwave substrate and the housing can improve the welding firmness of the substrate and the housing, guarantee the cleanliness of the upper surface of the substrate, improve the grounding and radiating performance of the substrate and further improve the electrical performance and the reliability of components.

A high gain broadband planar antenna is provided for overcoming conventional antenna structure that cannot be applied to a high gain broadband. The antenna includes a microwave substrate having a first surface and a second surface, a first symmetric radiation unit having a first radiation part and a second radiation part disposed on the first surface, a second symmetric radiation unit having a third radiation part and a fourth radiation part disposed on the second surface, and at least one connecting unit connected to the microwave substrate and a reflector. An end terminal of each first radiation part, second radiation part, third radiation part and fourth radiation part adopts a step structure design. The planar antenna of the present invention can achieve a high gain broadband effect.

A coupled multi-band antenna with the broadband function includes a coupled radiator, a feed wire, a first radiating extension, and a second radiating extension. The coupled radiator has a microwave substrate, a coupled metal element, a first radiating element, a second radiating element, and a connecting portion. The coupled metal element is connected to the positive terminal of the feed wire, and the second radiating element is connected to the negative terminal of the feed wire for the purposes of transmitting electrical signals and generating the multi-band operating modes of the antenna. By connecting the first and second radiating extensions to the coupled radiator, the surface current distribution and impedance variation of the antenna can be effectively adjusted to provide multi-band functions. The antenna utilizes the simple structure of coupled radiator to achieve multi-band operations and uses the radiating extensions to provide sufficient bandwidths.

The invention discloses a lamination type three-dimensional LTCC perpendicular-interconnection microwave module. The lamination type three-dimensional microwave module comprises a metal supporting body, a dielectric body, an upper layer LTCC substrate and a lower layer LTCC substrate, wherein the upper layer LTCC substrate and the lower layer LTCC substrate are designed according to work frequency bands of a microwave circuit module. A fuzz button perpendicular-interconnection structure is embedded in the dielectric body in the vertical direction. The upper layer LTCC substrate and the lower layer LTCC substrate are aligned and laminated on the upper surface and the lower surface of the dielectric body respectively. The upper layer LTCC substrate and the lower layer LTCC substrate are perpendicularly interconnected in a microwave mode through fuzz buttons in the dielectric body. The dielectric body and the LTCC substrates are arranged in the metal supporting body after being aligned and laminated, so that the lamination type three-dimensional LTCC perpendicular-interconnection microwave module is obtained. The microwave module is easy to locate and dismantle and low in cost of the perpendicular-interconnection technology, high-reliability electrical interconnection between the two-dimensional LTCC microwave substrates is achieved through the three-wire type fuzz buttons, and good microwave perpendicular transmission performance is achieved in the X waveband lamination type three-dimensional microwave circuit module.

The invention discloses a method for preparing a low-dielectric-constant microwave dielectric ceramic material by a solid phase synthesis method, and belongs to the raw ceramic powder preparation technology in the field of low temperature co-fired ceramic (LTCC). With adopting of a conventional process and conventional equipment of the low temperature co-fired ceramic field, the ceramic powder material is prepared through the procedures of proportioning, ball milling, melting, crushing, compounding, secondary ball milling, granulating and the like. The ceramic material has the many advantages of low dielectric constant, low dielectric loss, good temperature stability, good processability, cheap raw materials, simple preparation process, low production cost, no special requirements on the equipment workshop environment and the like. The low-dielectric-constant microwave dielectric ceramic material provided by the invention can be used as a core material of electronic circuit substrates, resonators, filters, microwave substrates and microstrip lines, and also has important application prospects and economic benefits in electronic circuits, microwave communication, satellite communication and radar systems.

An electronic device and a composite antenna thereof belong to the technical field of an electronic product. The electronic device comprises a system main body, a display main body and the composite antenna, wherein the system main body is provided with a first groove and a ground surface, a radio-frequency signal ground end is arranged on the ground surface, the display main body is provided with a second groove, the composite antenna is provided with a first metal radiation body and a second radiation body, the first metal radiation body is arranged in the first groove and provided with a radio-frequency signal feed end, the radio-frequency signal feed end is arranged on a microwave substrate and near to the system main body, and the second metal radiation body is pivoted in a groove cavity jointly formed by the first groove and the second groove in a matching way and is taken as a rotation shaft of the display main body which is expanded, folded or turns over relative to the system main body. In the electronic device, a frame and a clearance zone are unnecessarily arranged to accommodate an antenna, and extra cost increase can be avoided; the composite antenna is accommodated in the grooves of the electronic device, the composite antenna can be prevented from interference of a human body when the electronic device is used, and ideal communication quality of the composite antenna during wireless radio wave transceiving can be guaranteed.

The invention discloses a microwave dielectric ceramic with low dielectric constant and high quality and a method for preparing the same. The chemical composition constitution formula of the microwave dielectric ceramic with low dielectric constant and high quality is Mg2(Si, Al )O4, which consists of MgO, SiO2 and Al2O3, wherein the mol percentage of the MgO to the SiO2 to the Al2O3 is equal to 60-70 to 15-35 to 0-15. The microwave dielectric ceramic with low dielectric constant and high quality is used as a core material for electronic circuit substrates, syntonizers, filters, microwave substrates and microstrip lines, and has important application prospect and economic benefit on electronic circuit, microwave communication, satellite communication and radar system.

The invention discloses a wide-beam antenna of a maritime satellite communication terminal. The wide-beam antenna comprises an upper parasitic patch, a lower circuit, a microwave substrate, a feed interface, conductive walls, a reflecting sheet and medium studs. The lower surface of the microwave substrate is connected with the reflecting sheet while the upper surface of the same is provided with the lower circuit, and the medium studs penetrate the microwave substrate to be fixed on the reflecting sheet. The upper parasitic patch is set up above the lower circuit through the medium studs, an inner conductor of the feed interface is connected with the lower circuit while an outer conductor of the same is connected with the reflecting sheet, and the conductive walls are arranged on the periphery of the microwave substrate on the reflecting sheet. The lower circuit is composed of a lower parasitic patch, impedance matching branches, a phaser and a power divider, wherein the impedance matching branches are connected between the lower parasitic patch and the power divider as well as between the lower parasitic patch and the phaser. Based on a wide-beam antenna of a stacked structure, the circularly polarized maritime satellite antenna having the advantages of low profile, wide beam and broadband is designed by introduction of the vertical conductive walls, and is simple in structure, easy to produce and low in cost.

The invention discloses an integrated welding device for a microwave component, which is used for welding the microwave component composed of a box body, a microwave substrate, a glass bead and a connector. The integrated welding device comprises a base, an upper pressing module, a left pressing module and a right pressing module. The left pressing module comprises a left pressing block, self-locking buckles and a spring needle; the right pressing module comprises a right pressing block, self-locking buckles and a spring needle; the upper pressing module comprises an upper pressing block, self-locking buckles and a spring needle. The self-locking buckles are mounted on the left pressing block, the right pressing block and the upper pressing block. Positioning pins are mounted on the base. The self-locking buckles are buckled with the positioning pins, so that the left pressing block, the right pressing block and the upper pressing block are respectively fixedly connected with the base. A spring needle hole is formed in each of the left pressing block, the right pressing block and the upper pressing block, and each of the spring needles is mounted on the corresponding spring needle hole, so that the left pressing block, the right pressing block and the upper pressing block compress the microwave component through the spring needles. The integrated welding device disclosed by the invention has the advantages of being high in welding efficiency, good in welding quality consistency, high in welding and positioning precision, free from product damage in the assembly process, good in reliability, simple to operate and the like.

The invention relates to a K-waveband dielectric disk-loaded circular waveguide feed filter (1) for a physical position measurement radar system, comprising a circular waveguide (4) which connects an antenna and a microwave circuit and two dielectric disks (3) which are loaded in the circular waveguide (4), the electromagnetic wave transmission mode in the circular waveguide (4) is TE11 mode, thetwo dielectric disks (3) loaded in the circular waveguide are processed by a commercial microwave substrate (2), the microwave substrate (2) etches the circular dielectric disks (3) through the pattern plating etching method, and a series of metal through holes (5) which surround the dielectric disks are processed on the outer rings of the dielectric disks, thereby forming an equivalent circular waveguide wall. The K-waveband dielectric disk-loaded circular waveguide feed filter can directly use the microwave substrate with high dielectric constant and good thermal resistance, the processing of the parts is very simple and the cost is low. As the dielectric disks in the filter have thin thickness, less loss and good matching performance, the insertion loss of the feed filter in the workingband is less than 0.1dB. In addition, as the dielectric disks are solid structures and have good dust-proof and thermal insulating performances, the feed filter can effectively protect a microwave circuit part of the radar system.

The invention discloses an ultra-wideband monopole antenna with an expanded horizontal plane open circuit section and a semi-oval slot. The front surface of a microwave substrate is a metal surface and adopts a coplanar waveguide feed form; one section (which stretches out and is higher than metal grounds at two edges) of a feed line is a metal coupling wire; the metal coupling wire is connected with the bottom surface of a rectangular metal sheet with an upward opening and the semi-oval slot; and meanwhile, the metal grounds at the two edges are upwards extended, namely, one section of expanded horizontal plane open circuit section respectively extends at each one of two outer sides of the metal grounds. The antenna sufficiently utilizes a feed manner of coplanar waveguide and realizes the ultra-wideband performance through a rectangular patch with the expanded horizontal plane open circuit section and the semi-oval slot; the radiation property of a monopole is met; and meanwhile, the antenna is relatively compact and characteristics of single surface can be relatively and conveniently integrated with other circuits. The antenna is simple to manufacture and is easily integrated with a PCB (Printed Circuit Board); and the ultra-wideband monopole antenna can be widely applied to various ultra-wideband wireless communication systems of hand-holding, data transmitting, imaging, target identifying and the like.

The invention discloses a welding technology for a microwave substrate, relates to the electronic technical field and aims at solving the technical problems of poor stability, high technological difficulty and the like caused by the fact that substrates are bonded on cavities directly traditionally. The welding technology comprises the steps of a) cleaning the microwave substrate, and placing the microwave substrate on a steel mesh with the welding surface upward; b) coating a layer of solder paste on the welding surface of the microwave substrate, and avoiding a tube core bonding hole during coating; c) putting the solder paste coated microwave substrate in a product cavity, compressing the microwave substrate through a compression block and fixing the compression block and the microwave substrate with a clamp; and d) putting the product in a reflow oven for welding, taking down the clamp after welding, checking the welding quality, and cleaning the microwave substrate.

The invention relates to an anti-phase microwave power divider with arbitrary power distribution ratio. The length of a work wave is lambda; the divider has a parallel strip line, wherein the width of two arms of the strip line is as the same as each other, the depth of the strip line is h, and the characteristic impedance is Z0; public metal earth is inserted into a microwave substrate at the h / 2 of the depth of one side of the parallel strip line, wherein the inserting depth is l1; a back-to-back symmetrical micro strip pair with the length of l1 and the same width of the arm is formed; thewidth of the arm corresponding to public earth is changed to form into an asymmetric micro strip pair with the length of lambda / 4 and the different lengths of the two arms; the parallel strip line terminal lead input port with the depth of h and the asymmetric micro strip lead two output ports with the depth of h / 2 respectively have output power of P2 and P3 and arbitrary power distribution ratios of 1: K2, wherein the K2 equals to1, 2, 3... ; and the characteristic impedance corresponding to the asymmetric micro strip pair is respectively as follows: the public earth is provided with a fold line-shaped gap corresponding to the output end, and the symmetric center of the gap is inserted into the isolation resistance, wherein the vertical distance from the isolation resistance to the output port is as the same as the inserting depth. The divider has the advantages that the anti-phase belt width is wide, can design different arm widths of the asymmetric micro strip pair to obtain two powder distributions with arbitrary power ratio, and has good isolation and small power dissipation.

The invention discloses a V-based low temperature sintering microwave medium ceramic material and a preparation method thereof. The material comprises the following components in percentage by weight: 99-100% of LiMg4V3O12 and 0-1% of low melting point substance, wherein the low melting point substance is one of Bi2O3, B2O3 and BaCu (B2O5); and through solid phase reaction, the material disclosed by the invention can be obtained. According to the invention, the prepared microwave medium ceramic has the advantages of low sintering temperature, excellent microwave performance, high Q*f value and small temperature coefficient Tauf of resonance frequency and cannot react with silver (Ag); and pure silver can be used as an inner electrode for co-firing, so that the manufacturing cost of the device can be greatly reduced and the microwave medium ceramic material can be used for manufacturing low temperature co-fired LTCC (Low Temperature Co Fired Ceramic) microwave substrates.

The invention discloses a dual-band array antenna of a frequency-selection-based surface resonance unit. A metal surface is arranged on the front of a microwave substrate, large metal wafers, four of which form a group, are mounted at equal intervals on the metal surface of the microwave substrate, a small metal wafer is respectively and coaxially mounted on each large metal wafer and supported by an insulated medium, an air dielectric is respectively formed between the microwave substrate and the large metal wafers and between the large metal wafers and the small metal wafers, a feeding network is arranged on the back of the microwave substrate, a feeding port is divided into probe feeding ports of four cell arrays by a feeding network, and a signal respectively passes through the probe feeding ports so that electromagnetic energy is indirectly coupled with and fed to the large metal wafers and directly fed to the small metal wafers. The invention has the advantages of simple whole structure, great making material selection range, low section, and the like and is applied to occasions, such as the navigation positioning of planes, ships, vehicles, and the like, satellite transceiver antennae and other occasions with high requirements for the section heights and the qualities of antennae.

A planar waveguide structure for creating a phase gradient between the input signals of a system of antenna elements requires relatively little space and also ensures relatively low-loss beam deflection. The waveguide structure is provided on a dielectric microwave substrate, which has at least one conductive layer on both sides. At least one of the two conductive layers is structured and constitutes the signal side of the wave structure, while the other conductive layer is used as ground. The waveguide structure includes at least one parallel plate guide having beam lobe ports for signal feed and signal pickup. This parallel plate guide has a curved-shaped reflector contour so that it functions as a signal reflector.

The invention discloses a planar integrated microwave height-finding radar applied to an unmanned aerial vehicle. The radar comprises a microwave substrate, a first substrate and a second substrate, wherein the microwave substrate, the first substrate and the second substrate are sequentially stacked from top to bottom, a radio frequency transceiver front end, a transmitting antenna, a receiving antenna, a first filter, a second filter and a hybrid ring are arranged on the upper surface of the microwave substrate, and a frequency synthesizer, a power management module, a communication interface module and a control processing circuit are arranged at the bottom of the second substrate. The invention furthermore discloses a measurement method of the planar integrated microwave height-findingradar applied to the unmanned aerial vehicle. A radar sensor for performing precise and stable height measurement all time is constructed.

The invention discloses a vanadium-based temperature-stable ultralow-temperature sintered microwave dielectric ceramic material and a preparation method thereof. The ceramic material consists of a material shown by a general formula (Ba1-xSrx)V2O6, wherein x is 0.35-0.55; and the ceramic material has good microwave dielectric properties (the dielectric constant is 9.3-11.1, the quality factor is 10000-14900GHz, and the temperature coefficient of resonance frequency is -10.2 to +9.1ppm / DEG C), is low in sintering temperature (575-650 DEG C), and can be matched and co-fired with an Al electrode. The vanadium-based temperature-stable ultralow-temperature sintered microwave dielectric ceramic material disclosed by the invention is prepared by virtue of traditional solid phase reaction, is rich in used raw materials, low in cost and beneficial for industrial production, and can be widely applied to the manufacturing of microwave devices including a low-temperature co-fired ceramic system, a multilayer dielectric resonator, a wave filter, a microwave substrate and the like.

A method for manufacturing a microwave substrate is disclosed. In particular, the method of the present invention uses the sol-gel process to form a ceramic-polymer composite microwave substrate. First, an alkoxy silane, water, a catalyst, an alcohol, and a polymer are mixed to form a sol-gel mixture. Next, the water and alcohol in the sol-gel mixture are removed by exerting a pressure. Finally, the sol-gel mixture is sintered to form a microwave substrate.

A planar waveguide structure for creating a phase gradient between the input signals of a system of antenna elements requires relatively little space and also ensures relatively low-loss beam deflection. The waveguide structure is provided on a dielectric microwave substrate, which has at least one conductive layer on both sides. At least one of the two conductive layers is structured and constitutes the signal side of the wave structure, while the other conductive layer is used as ground. The waveguide structure includes at least one parallel plate guide having beam lobe ports for signal feed and signal pickup. This parallel plate guide has a curved-shaped reflector contour so that it functions as a signal reflector.

The invention belongs to the field of electronic ceramic materials and preparation thereof, and in particular relates to a microwave dielectric LTCC material and a preparation method thereof. The CaWO4 system microwave dielectric LTCC material provided by the invention comprises two phases of mixed CaWO4 and Li2TiO3 and 0.5-1wt% of an LBSCA glass fluxing agent, wherein tetragonal-phase scheelite CaWO4 is taken as the main crystal phase; a monoclinic system structure Li2TiO3 is taken as the auxiliary phase; the weight percentage ratio of the mixed material CaWO4 to Li2TiO3 is (84-86%):(14-16%); the total mixed material weight percentage of the LBSCA glass fluxing agent is 0.5-1wt%. The sintering temperature of the material is 900-950 DEG C, the dielectric constant of the material is 11.8-12.4, the Q*f value of the material is 57000-76000GHz, and the temperature coefficient of resonance frequency of the material is minus 2.9-1.1ppm / DEG C. The microwave dielectric LTCC material can be widely applied to LTCC microwave substrates and laminated microwave devices and modules.

The invention discloses an antenna capable of producing radio frequency orbital angular momentum beams based on a dielectric resonator. The antenna comprises a microwave dielectric resonator, a microstrip line, a microwave substrate and a metal ground plane, wherein the microwave dielectric resonator adopts a cylindrical structure and has an annular cross section, the external diameter is D, the internal diameter is d, the height is h, and d is larger than or equal to 0 and smaller than D; the relative dielectric constant of the microwave dielectric resonator is epsilon r, the microwave dielectric resonator is placed on the microwave substrate with the relative dielectric constant being epsilon s, the metal ground plane is arranged below the microwave substrate, the microwave dielectric resonator performs feeding through the microstrip line, and a whispering-gallery mode in the dielectric resonator is excited. The dielectric resonator with simple structure is designed and used to realize emission of radio frequency beams carrying different l-order orbital angular momentum at different direction angles, and the antenna has quite important meaning for the emerging fields of high-speed radio frequency communication, radar detection and the like by using the orbital angular momentum.

A multi-frequency antenna includes a microwave substrate, a first antenna unit, a second antenna unit, a third antenna unit and a grounding unit. The first antenna unit, the second antenna unit, and the third antenna unit are disposed on the microwave substrate surface. The grounding unit is disposed at an edge on the surface of the microwave substrate. The grounding unit is in connection with the second antenna unit. The second antenna unit and the third antenna unit are bent to form perpendicular structures to the microwave substrate. The compact arrangement reduces the physical footprint of the antenna module to enable fitment in a wide range of products having tight special constraint.

Provided are an integrated dielectric resonator filter and a clock extraction device using the integrated dielectric resonator filter. The integrated dielectric resonator filter includes: a microwave substrate; a disc type dielectric resonator installed on the microwave substrate and having predetermined diameter and height; an input and output transmission line installed on both sides of the disc type dielectric resonator to transmit input and output signals; and a metal cover enclosing the disc type dielectric resonator to form a predetermined volume, opened toward the input and output transmission line, and closed in an orthogonal direction to the input and output transmission line.