45results about How to "Good electrical performance consistency" patented technology

The invention relates to a Ku-wave band and ultra-narrow band micro band-pass filter with low loss and high inhibition, which comprises an input / output interface, four parallel resonant units, a Z-shaped cross coupling circuit and an input and output inductor, wherein the input / output interface is suitable for surface mounting; the four parallel resonant units are realized by adopting two layers of folded coupling strip lines; and the structures are realized by adopting a multi-layer low-temperature co-fired ceramic (LTCC) process technology. The invention has the advantages of good band-passselectivity, good out-of-band inhibition, low insert loss, light weight, small volume, high reliability, good electrical performance, good phase frequency characteristic linearity, good temperature stability, good electrical performance batch consistency, low cost and the like, can realize large batch production, and is especially suitable for wireless communication handheld and portable terminalproducts such as radars, communication terminals, rocket-borne terminals, air-borne terminals, missile-borne terminals, space ships, individual mobile communication terminals and the like, and corresponding frequency band systems with strict requirements on volume, weight, electrical performance, reliability and the like.

The invention relates to an L wave band miniature band pass filter with low loss and high suppression, which comprises a surface-mounted input / output interface, five parallel resonance units achieved by adopting three layers of folded and coupled strip lines, four zero setting circuits and an input and output inductor, which are all achieved by adopting a multi-layer low temperature co-fired ceramic technology. The invention has the advantages of small volume, light weight, high reliability, excellent electrical performance, good phase-frequency characteristic linearity, good temperature stability, good bulk electrical performance consistency, low cost, mass production and the like, and is particularly suitable for radar, communication, rocket-bearing, airplane-bearing, missile-bearing, spacecrafts, one-man mobile communication terminals and other handheld and portable radio communication terminal products, as well as corresponding band systems which are serious about volume, weight, electrical performance and the like.

The invention discloses a power inductance element formed by molding. The power inductance element comprises a prefabricated magnetic core, a coil and a magnetic plastic package layer, wherein the coil is placed on the prefabricated magnetic core; the magnetic plastic package layer is formed by molding and is used for covering the magnetic core and the coil; and an electrode connected with the coil is exposed. The invention also discloses a method for manufacturing the power inductance element formed by molding. The method comprises the following steps of: a, prefabricating the magnetic core and placing the coil on the prefabricated core; and b, covering the magnetic plastic package layer on the magnetic core and the coil by virtue of molding and exposing the electrode connected with the coil. The power inductance product has the advantages of thinning, miniaturization and high reliability.

The invention relates to a hybrid lumped distribution miniature band-pass filter. The hybrid lumped distribution miniature band-pass filter comprises a 50-ohmage input-output port installed on the surface, four parallel-connection resonance units, two interstage coupling inductors, a interstage coupling capacitor, a Z-shaped cross coupling capacitor and an input / output inductor which are all achieved through the multilayer low-temperature co-fired ceramic technical skill. The hybrid lumped distribution miniature band-pass filter has the advantages of being good in band-pass selectivity and out of band rejection, low in insertion loss, light in weight, small in volume, high in reliability, good in electric performance, phase-frequency characteristic linearity, temperature stability and electric performance batch uniformity, low in cost, capable of being produced massively and the like, and is especially applicable to radars, communication, rocket carrying, plane carrying, missile carrying, spacecrafts, man-portable mobile communication terminals and other wireless communication handheld and portable terminal products and corresponding frequency range systems with strict requirements for volume, weight, electric performance, reliability and the like.

The invention relates to a C-band low-loss and high-inhibition micro band-pass filter which comprises an input interface and an output interface which are applicable to surface installation, five parallel resonance units realized by adopting two layers of folded coupling strip lines, four zero-point setting circuits, an input inductance and an output inductance, wherein the structures are realized by adopting a multilayer low-temperature co-fired ceramic process technology. The micro band-pass filter of the invention has the advantages of small volume, light weight, excellent electrical performance, high reliability, good linearity of phase-frequency characteristic, good temperature stability, fine batch consistency of electrical performance, low cost and the like, is suitable for mass production, is especially applicable to hand-hold and portable finished products for wireless communication, such as radars, communication, arrow loading, sky borne, missile borne, space ships, one-man mobile communication terminals, and the like as well as corresponding frequency range system with rigorous requirements on volume, weight, electrical performance, reliability and the like.

The invention relates to a high stop-band inhibiting multi-zero 2.4 GHz mini filter, comprising an input / output interface arranged on the surface, two parallel-resonance units, an interstage couplingelectric capacity and an inductance and two sets of zero set circuits; and all the parts are produced by low temperature co-fired ceramic technology. The mini filter has the advantages of small volume, light weight, high reliability, excellent electric property, linear change of phase frequency character, good temperature stability, excellent consistency of electric property indicator batch, low cost for multitudinous production and the like, especially applicable to Bluetooth transmission, industry, science and medication (ISM) frequency range transmission, corresponding microwave frequency range communication, digital radar, single soldier satellite movement, communication terminals, military and civil multimode and multipath communication system terminals, wireless communication hand-hold terminals and other corresponding systems with strict requirements on volume, weight, property and reliability.

The invention discloses a wideband mini low temperature co-fired ceramic balance filter. The wideband mini low temperature co-fired ceramic balance filter comprises an input port and two output ports applicable to surface mounting, two cascade connection capacitors, three zero capacitors, three zero inductors, four coupling strip lines and a ground connection port, wherein each element is designed by using a lumped parameter strip line, and the structure is achieved by using multilayer low temperature co-fired ceramic process technology. The wideband mini low temperature co-fired ceramic balance filter has the advantages of being small in size, wide in frequency band, low in weight, high in reliability, good in phase frequency character linearity, good in temperature stability, low in cost, and capable of being produced in large batch quantity, having low phase unbalance performance and low amplitude unbalance performance and the like, wherein the advantage of being small in size has extremely important significance for research of microwave system miniaturization. A microwave balance filter is an extremely important device in a modern wireless communication system. Furthermore, the wideband mini low temperature co-fired ceramic balance filter is applicable to a radio frequency front end module.

The invention discloses a miniature C-band band-pass filter with low insertion loss and excellent high-order harmonic suppression, which comprises an input port, an output port, an input inductor, an output inductor, an input capacitor, an output capacitor, five parallel resonance units, four zero set units, two cross-coupled capacitors and the like. All components comprise more than two layers and are realized by low-temperature co-fired ceramic technology, the input inductor, the output inductor, the input capacitor and the output capacitor are in a strip line design according to distributed parameters, intervalve inductors and intervalve capacitors adopt space coupling and distributed parameters, the cross-coupled capacitors are dielectric tablet 'Z'-shaped capacitors, and all the five parallel resonance units are in a three-layer folding and coupling strip line design. The band-pass filter of a stacked structure based on the low-temperature co-fired ceramic technology has the advantages of small size, light weight, high reliability, low insertion loss, excellent high-order harmonic suppression and the like, and meets the requirements of fields such as electronic communication and the like on miniaturization and integration of the electronic components.

The invention relates to a low-loss high-suppression minitype cavity body band-pass filter which comprises 50 ohmic impedance input / output interfaces suitable for surface mounting, five parallel resonant units and input and output inductors, wherein the five parallel resonant units are realized by adopting a distributed parameter cylindrical cavity body coupling structure; and the 50 ohmic impedance input / output interfaces, the five parallel resonant units as well as the input and output inductors are realized by adopting a multilayer low-temperature co-fired ceramic technology. The low-loss high-suppression minitype cavity body band-pass filter provided by the invention has the advantages of good band-pass selectivity, good out-of-band suppression, lower insertion loss, small volume, light weight, high reliability, good electric property, good phase frequency characteristic linearity, good temperature stability, good electric property batch consistency, low cost, volume production and the like, and is especially suitable for wireless communication hand-held and portable terminal products of radars, correspondence, rocket carrying, aircraft carrying, missile carrying, spacecrafts, individual soldier mobile communication terminals and the like, as well as places and corresponding frequency band systems which have rigor requirements in volume, weight, electric property, reliability and the like.

The invention discloses a gallium arsenide monolithic integrated numerical-control real time delay circuit which consists of different basic delay potentials and is characterized in that more than two different basic delay potentials are integrated on the same chip by adopting the integrated circuit technology and the basic delay potentials are connected in series, wherein, each basic delay potential comprises single-pole double-throw switch modules, a delay module and an amplitude adjustment module; the common terminal of one single-pole double-throw switch module is connected with the input signals, and the other two terminals thereof are connected with the input terminals of the delay module and the amplitude adjustment module respectively; and the common terminal of the other single-pole double-throw switch module is the signal output terminal, and the output terminals of the delay module and the amplitude adjustment module are connected with the other two ends thereof. The invention can improve the delay precision, so that better consistency of electrical properties is ensured and the invention is least controlled and affected by the technology; meanwhile, the invention increases the signal amplitude adjustment circuit, compensates for the amplitude fluctuation of the delay branch, fulfils the functions of a plurality of circuits in the transceiver system and reduces the complexity of the system.

The invention relates to a self-riveting silicon steel sheet iron core, which is formed by overlapping and riveting a plurality of silicon steel sheets. Each of the silicon steel sheets is a self-riveting silicon steel sheet having a first surface and a second surface both of which are opposite to each other; a riveting buckle is punched on the silicon steel sheet and comprises a first riveting surface formed on the first surface and inwardly recessed on the first surface, and a second riveting surface formed on the second surface and outwardly protruding on the second surface; a groove inwardly recessed on the first surface is defined by the first riveting surface; a bump outwardly protruding on the second surface is defined by the second riveting surface; the first riveting surface and the second riveting surface are the same in shape; and when two of the self-riveting silicon steel sheets are riveted with each other, the bump of the first self-riveting silicon steel sheet is clamped in the groove of the second self-riveting silicon steel sheet, and the first riveting surface of the first self-riveting silicon steel sheet is tightly attached to the second riveting surface of the second self-riveting silicon steel sheet. The iron core provided by the invention is convenient and shortcut in assembly, and the assembled iron core is flat in surface and favorable in electric property consistency.

The invention relates to the technical filed of energy storage batteries, in particular to a battery energy storage system. The battery energy storage system comprises a battery rack module, a direct-current conflux positive bus row, a direct-current conflux negative bus row and multiple battery clusters. According to the battery energy storage system, on one hand, soft copper rows are adopted forreplacing traditional power cables in power loop connection among battery packs, the labor cost can be effectively reduced, the circuit length difference and internal resistance difference of the battery clusters are reduced, current equalization of the battery clusters is guaranteed, the consistency of electrical performance is good, accordingly, the energy efficiency of the battery clusters isimproved, and the service life of the battery clusters is prolonged; on the other hand, the direct-current conflux positive bus row and the direct-current conflux negative bus row are arranged on thetwo sides of the battery rack module respectively at intervals, the situation is avoided that line outgoing exists at the total positive output ends and total negative output ends of the battery clusters simultaneously, wire arrangement and maintenance are convenient, meanwhile, the safe distance between a positive pole and a negative pole is guaranteed, and accordingly the risks of short circuitsand electric leakage are effectively reduced.

The invention discloses a C-waveband ultra-wideband multi-octave miniature directional coupler, which comprises four 50ohm input and output ports, an asymmetrical strip line, a symmetrical strip line, a three-dimensional folded-structured coupling strip line and a grounding plate, wherein the four 50ohm input and output ports are installed on the surface of the C-waveband ultra-wideband multi-octave miniature directional coupler. The structure is realized by adopting a multilayer high-frequency low-loss medium-laminated process technology, and the C-waveband ultra-wideband multi-octave miniature directional coupler disclosed by the invention has the advantages of wide working frequency band, small size, high reliability, excellent electrical performance, small through and coupling-port amplitude derivation, good temperature stability, good heat-radiating performance, simple structure, high finished-product ratio, good mass-production electrical-performance index consistency, low cost, convenience in installation and use and the like and can be widely used in corresponding-frequency communications and radars as well as wireless systems.

The invention relates to an ultra-wide-band microfilter which comprises input / output interfaces applicable to surface mounting and input and output inductors, wherein a distribution parameter strip line is adopted for implementation; the input / output interfaces as well as the input and output inductors are realized by adopting a multilayer low-temperature co-fired ceramic technology. The ultra-wide-band microfilter provided by the invention has the advantages of wide frequency covering, small insertion loss, light weight, small size, high reliability, good electric property, good phase frequency characteristic linearity, good temperature stability, good electric property batch consistency, low cost, volume production and the like, and is especially suitable for wireless communication hand-held and portable terminal products of radars, correspondence, rocket carrying, aircraft carrying, missile carrying, spacecrafts, single soldier mobile communication terminals and the like, as well as corresponding frequency band systems which have rigor requirements in size, weight, electric property, reliability and the like.

The invention relates to a self-riveting iron core transformer. The self-riveting iron core transformer comprises an iron core which is formed by overlapping and riveting a plurality of self-riveting silicon steel sheets, wherein each self-riveting silicon steel sheet is provided with a first surface and a second surface, and riveting buckles are punched on the first surface and the second surface; the riveting buckles comprise first riveting surfaces which are formed on the first surface and are concaved on the first surface and second riveting surfaces which are formed on the second surface and are convex on the second surface; the first riveting surfaces are arranged into grooves which are concaved on the first surface; and the second riveting surfaces are arranged into bulges which are convex on the second surface; the first riveting surfaces and the second riveting surfaces have the same shape; the bulges of the first self-riveting silicon steel sheet are clamped into the grooves of the second self-riveting silicon steel sheet during riveting; and the first riveting surfaces of the first self-riveting silicon steel sheet are tightly pressed on the second riveting surfaces of the second self-riveting silicon steel sheet. In the transformer, the iron core is formed by riveting the self-riveting silicon steel sheets, so that the transformer is convenient and fast for assembling, and the assembled transformer has relatively high electrical property.

The invention relates to a 6300MHz miniature high-pass filter, which comprises an input port, an output port, three filter capacitors and two filter inductors, wherein the input ports are applicable to surface mounting, all elements respectively adopt the lumped parameter strip line design, and the structure is respectively realized by adopting the multilayer low-temperature co-fired ceramic process technology. The 6300MHz miniature high-pass filter has the advantages that the size is small, the insertion loss is small, the passband frequency extending is high, the weight is light, the reliability is high, the phase frequency characteristic linearity is good, the temperature stability is good, the cost is low, mass production can be realized, and the like, wherein the characteristic of small size has very important significance on the miniature study of a microwave system. The 6300MHz miniature high-pass filter is widely applicable to aviation, aerospace, individual electronic intelligent weapon, onboard and missile-borne wireless systems.

The invention relates to the technical field of electronic assembly, in particular to a laser tin-spraying welding method for a welding spot in a narrow deep cavity, which comprises the following steps of: (1) selecting a tin ball with a proper size; (2) cleaning a position to be welded; (3) coating a soldering flux; (4) laser preheating; (5) discharging balls; (6) light following; according to the laser tin spraying welding method, the welding spots meeting the welding quality and performance indexes are obtained by selecting tin balls with proper sizes, optimizing the process path and reasonably setting process parameters, non-contact, local heating, accurate positioning and efficient welding are achieved, and the problems that manual welding cannot be operated or the operation space is limited, the welding spot qualification rate is low, and the welding quality is poor are solved. And the consistency is poor.

The invention relates to a plant stealth material and a preparation method thereof, and concretely relates to a loofah sponge stealth material and a preparation method thereof. The plant stealth material is composed of loofah sponge units and an electromagnetic shielding cloth, the loofah sponge units are partially impregnated in a wave absorbing liquid, and the loofah sponge units are distributedand fixed on the upper surface of the electromagnetic shielding cloth. The preparation method comprises the steps of screening, cutting, wave absorbing liquid impregnation, drying, slitting and sewing. The method has a simple process, and is convenient to operate, and the product has a microwave broadband stealth performance, a visible light / near infrared camouflage and thermal infrared stealth function and an electromagnetic shielding performance, and further has the advantages of small density, flexibility, high strength, resistance to high temperature and low temperature, greenness, environmental friendliness and long service life.

The invention discloses a patch type inductive element and a manufacturing method thereof. The inductive element comprises a magnetic core body, a coil and a magnetic core top cover, wherein the magnetic core body is provided with a bottom and a winding part protruding from the bottom; the coil is wound on the winding part of the magnetic core body; the magnetic core top cover is provided with a winding part containing cavity; the winding part of the magnetic core body is inserted into the winding part containing cavity of the magnetic core top cover; the magnetic core body is adhered with themagnetic core top cover through an adhesion material; a first electrode board and a second electrode board are respectively arranged at two ends of the bottom of the magnetic core body; wire handingslots are formed in the side surfaces of the electrode boards; and two ends of the coil are welded on the electrodes and are led out and led in through the wire hanging slots in the side surfaces of the electrode boards. The patch type inductive element is capable of remarkably improving the automatic level of production of the patch type inductive element and remarkably improving the product production efficiency and yield, thereby realizing automation, keeping relatively product characteristics and having strong product applicability.

The invention discloses a patch-type network transformer and a manufacturing method thereof. The patch-type network transformer comprises a packaging substrate unit, a signal conditioning module and a head cover, wherein electrodes are arranged on the upper surface and the lower surface of the packaging substrate unit; the signal conditioning module is attached to the packaging substrate unit; the head cover is arranged on the packaging substrate unit and covers the signal conditioning module; a plurality of openings for glue filling are arranged in the head cover; and the packaging substrate unit, the signal conditioning unit and the head cover are spliced and fixed together through pouring glue filled from the openings. The patch-type network transformer is simple and convenient to manufacture and good in quality; and the production efficiency and the qualified rate of a product can be greatly improved.

The invention relates to a high stop-band inhibiting multi-zero 2.4 GHz mini filter, comprising an input / output interface arranged on the surface, two parallel-resonance units, an interstage coupling electric capacity and an inductance and two sets of zero set circuits; and all the parts are produced by low temperature co-fired ceramic technology. The mini filter has the advantages of small volume, light weight, high reliability, excellent electric property, linear change of phase frequency character, good temperature stability, excellent consistency of electric property indicator batch, low cost for multitudinous production and the like, especially applicable to Bluetooth transmission, industry, science and medication (ISM) frequency range transmission, corresponding microwave frequency range communication, digital radar, single soldier satellite movement, communication terminals, military and civil multimode and multipath communication system terminals, wireless communication hand-hold terminals and other corresponding systems with strict requirements on volume, weight, property and reliability.

The invention discloses a power inductance element formed by molding. The power inductance element comprises a prefabricated magnetic core, a coil and a magnetic plastic package layer, wherein the coil is placed on the prefabricated magnetic core; the magnetic plastic package layer is formed by molding and is used for covering the magnetic core and the coil; and an electrode connected with the coil is exposed. The invention also discloses a method for manufacturing the power inductance element formed by molding. The method comprises the following steps of: a, prefabricating the magnetic core and placing the coil on the prefabricated core; and b, covering the magnetic plastic package layer on the magnetic core and the coil by virtue of molding and exposing the electrode connected with the coil. The power inductance product has the advantages of thinning, miniaturization and high reliability.

The invention discloses a miniaturized high-overload-resistant circularly polarized omnidirectional antenna. The antenna comprises an antenna housing internally provided with a spiral assembly and a low-noise amplifier assembly, and the spiral assembly is fixed in the antenna housing through the low-noise amplifier assembly; the spiral assembly comprises a spiral column, and double spiral lines are arranged on the spiral column; the low-noise amplifier assembly comprises a low-noise circuit board fixed between the low-noise amplifier cavity and a low-noise amplifier shielding cover; the spiralcolumn is fixedly connected with the low-noise amplifier cavity, one end of the double spiral lines is connected with the low-noise circuit board, and the other end of the double spiral lines is grounded; and a fixing bolt sequentially penetrates through the low-noise amplifier shielding cover and the low-noise amplifier cavity to be fixedly connected with the antenna housing. According to the circularly polarized antenna provided by the double spiral lines, satellite signals can be received in a whole flight process of an aircraft, and particularly, reliability of the received signals can beensured under a condition that the aircraft faces the ground.

The invention provides an NTC thermosensitive resistor and a manufacturing method thereof. The NTC thermosensitive resistor comprises a ceramic body, and the ceramic body comprises a ceramic materialmain component and an additive; the main components of the ceramic material comprise the following components in percentage by mass: 35%-50% of Mn3O4, 25%-40% of Co3O4, 10%-15% of Fe2O3 and 1%-3% of CuO. The additive comprises the following components in percentage by mass relative to the total mass of the main components: 1%-3% of SiO2 and 0.5%-1.5% of ZrO2. The NTC thermosensitive resistor manufactured on the basis of the ceramic material has the advantages of low resistance, high B value, good device electrical property consistency, high bending strength and aging value of less than 1%, thethermosensitive resistor R25 is 4 k[ohm]-12 k[ohm], and the material constant is 3900 K-4050 K.

The invention discloses a patch-type network transformer and a manufacturing method thereof. The patch-type network transformer comprises a packaging substrate unit, a signal conditioning module and packaging glue, wherein electrodes are arranged on the upper surface and the lower surface of the packaging substrate unit; the signal conditioning module is attached to the packaging substrate unit; and the packaging glue is injected and molded on the packaging substrate unit and packages the signal conditioning module therein. The patch-type network transformer disclosed by the invention is simple and convenient to manufacture and good in quality; and the production efficiency and the qualified rate of a product can be greatly improved.

The invention relates to a polarization array omnidirectional antenna of the PHS's base stations and mainly solves the problems of poor signal and small percentage of coverage of the tri-sector polarization diversity omnidirectional antenna in the PHS's base stations. We arrange the three minus or plus 45 degrees dual-polarization platy directional antennas with three 0 degree / 90 degrees dual-polarization platy directional antennas interlacedly on the baseline of a hexagon to form the hexad-sector twelve-array minus or plus 45 degrees and 0 degree / 90 degrees qua-polarization diversity antenna structure and carry out the threeway power synthesis to the directional antenna with same degree. The terminals of the hexad-sector antenna export four cable wires of +45 degree, -45 degrees, 0 degree and 90 degrees and connect with the base station to realize receiving and sending out the signal with different polarization methods. The antenna has an omnidirectional radiation directional diagram in the horizontal plane. Compared with the common level omnidirectional antenna, the gain of every polarization terminal is more than 12.5dB, the isolation between any two terminals is less than -25dB and it improves the coverage of the omnidirectional base stations greatly and increases the covering distance of the base stations.

The invention discloses an ultra-wideband band-pass filter which comprises a medium, a transmission line, two grounded inductors, two via holes, a plurality of split ground structure units and a plurality of rectangular defected ground structure units. The transmission line is arranged in the middle of the upper layer of the medium, one end of the transmission line is connected with an input port, the other end of the transmission line is connected with an output port, the two grounded inductors are symmetrically distributed on the two sides of the transmission line and are perpendicularly connected with the midpoint of the transmission line respectively, the other ends of the grounded inductors are respectively connected with one via hole, and the via holes perpendicularly penetrate to the lower layer of the medium from the upper layer of the medium. The split ground structure units are sequentially etched on the lower layer of the medium in the direction of the transmission line, one rectangular defected ground structure unit is etched between every two adjacent split ground structure units, and the split ground structure units and the rectangular defected ground structure units are all perpendicular to the transmission line. According to each split ground structure unit, the two ends of a dumbbell defected ground structure are respectively provided with a gap in an etched mode. The gaps are perpendicularly connected with the midpoints of the borders at the two ends, and extend to the edge of the medium all the time. The ultra-wideband band-pass filter is high in performance, low in cost, small in size, and wide in application prospect.

The invention discloses a C-waveband ultra-wideband multi-octave miniature directional coupler, which comprises four 50ohm input and output ports, an asymmetrical strip line, a symmetrical strip line, a three-dimensional folded-structured coupling strip line and a grounding plate, wherein the four 50ohm input and output ports are installed on the surface of the C-waveband ultra-wideband multi-octave miniature directional coupler. The structure is realized by adopting a multilayer high-frequency low-loss medium-laminated process technology, and the C-waveband ultra-wideband multi-octave miniature directional coupler disclosed by the invention has the advantages of wide working frequency band, small size, high reliability, excellent electrical performance, small through and coupling-port amplitude derivation, good temperature stability, good heat-radiating performance, simple structure, high finished-product ratio, good mass-production electrical-performance index consistency, low cost, convenience in installation and use and the like and can be widely used in corresponding-frequency communications and radars as well as wireless systems.

The invention discloses a method for preparing a lithium iron phosphate positive electrode material by taking polycyclic aromatic hydrocarbon rein as a carbon source. The method comprises the steps of weighing iron phosphate and lithium hydroxide at the weight ratio of 1:3-5 firstly; uniformly mixing iron phosphate, lithium hydroxide and polycyclic aromatic hydrocarbon rein to obtain a mixture; adding the mixture into an ethanol solution and palletizing by adopting a wet process to obtain slurry containing ball-milled precursor; drying the slurry containing the ball-milled precursor in a drying oven, and pulverizing and screening the slurry to obtain a precursor; and finally putting the precursor into a high temperature furnace and performing thermal insulation to obtain the lithium iron phosphate positive electrode material. The carbon source adopted by the method is the polycyclic aromatic hydrocarbon rein, so that low temperature volatile component residue barely exists; the carbon content is more than 90wt%; the baking technological conditions have relatively less influences on a pyrolysis process, carbon residue rate and the like; and the obtained material is high in electrical property consistency.

The invention discloses a gallium arsenide monolithic integrated numerical-control real time delay circuit which consists of different basic delay potentials and is characterized in that more than two different basic delay potentials are integrated on the same chip by adopting the integrated circuit technology and the basic delay potentials are connected in series, wherein, each basic delay potential comprises single-pole double-throw switch modules, a delay module and an amplitude adjustment module; the common terminal of one single-pole double-throw switch module is connected with the inputsignals, and the other two terminals thereof are connected with the input terminals of the delay module and the amplitude adjustment module respectively; and the common terminal of the other single-pole double-throw switch module is the signal output terminal, and the output terminals of the delay module and the amplitude adjustment module are connected with the other two ends thereof. The invention can improve the delay precision, so that better consistency of electrical properties is ensured and the invention is least controlled and affected by the technology; meanwhile, the invention increases the signal amplitude adjustment circuit, compensates for the amplitude fluctuation of the delay branch, fulfils the functions of a plurality of circuits in the transceiver system and reduces the complexity of the system.