329results about How to "Meet different application requirements" patented technology

The invention discloses a double-channel embedded nerve stimulator which belongs to the technical field of embedded medical instruments. Two-way stimulating signals can be simultaneously produced forsimultaneously stimulating two target points of brain or nerve, thereby effectively controlling and treating diseases. The double-channel embedded nerve stimulator comprises a microcontroller, a double-channel pulse output circuit, a communication circuit, a power management circuit, a battery and the like, wherein a program memory, a digital-analog signal converter, a timer and the like are integrated in the microcontroller; the double-channel pulse output circuit comprises a DC-DC circuit, an output channel, a polarity selection circuit, a pulse output control circuit, a charge balance circuit and an electrode impedance measurement circuit; the communication circuit comprises a communication coil, a signal transmission circuit and a signal reception circuit; and the power management circuit is connected with the battery. A power supply is a primary battery or a charging battery capable of meeting different application requirements and exerting respective use advantages. Compared witha single-channel product, the double-channel embedded nerve stimulator doubles the treating capability and has high economic and social benefits.

The invention relates to a method for modifying the surface of carbon fiber coated with nano sol through plasma treatment, which comprises the following steps: firstly, nano particles are prepared into an organic solvent, a sol solution of water or a sol solution prepared by hybridization reaction of a precursor solution of organic-inorganic nano particles by the ultrasonic vibrating technology; secondly, the sol solution is coated on the surface of the carbon fiber, treated by means of spray coating and padding, and dried; and thirdly, the dried carbon fiber is placed on a special transport unit for plasma processing equipment and a plasma is sprayed on the surface of the carbon fiber to make the carbon fiber move in the plasma atmosphere, so as to generate surface modification, wherein the treating power is between 10 and , watts, and the treatment time is between 0.5 and 300 seconds. The method can effectively improve the performance of the fiber, improves the molded manufacturability and the overall properties of composite materials of the fiber, has simple technology, quick processing speed, good treatment effect and low cost, is convenient to operate and difficult to cause environmental pollution, can reduce energy consumption, and is suitable for industrial production.

The invention discloses a preparation method of a black phosphorus alkene-graphene composite material hollow microsphere. The preparation method comprises the steps of adding a black phosphorus alkene nanosheet or black phosphorus alkene quantum dot dispersion liquid into oxidized graphene nanosheet dispersion liquid firstly, and mixing the black phosphorus alkene and the oxidized graphene by adopting a mechanical agitation method; spraying the mixed dispersion liquid of the black phosphorus and the oxidized graphene into liquid helium by a spraying method and rapidly freezing the mixed dispersion liquid into microballoons; then putting the obtained black phosphorus alkene and oxidized graphene composite material microballoons into a freezer dryer for freeze-drying, so as to obtain the black phosphorus alkene and oxidized graphene composite material hollow microballoons; reducing the oxidized graphene into graphene at high temperature under the protection of nitrogen or argon, so as to obtain the balck phosphorus alkene and graphene composite material hollow miroballoons at last. The prepared black phosphorus alkene and graphene composite material hollow miroballoons have a potential application prospect in the fields such as lithium ion batteries, supercapacitors, sensors and filtration purification.

The invention relates to a periodic location region updating method of a dual card dual standby mobile phone with a single GSM communication module. An antenna in the mobile phone is connected with a radio frequency circuit which is connected with a baseband processor which is also connected with a memorizer, other control circuits and an analog switch; two SIM cards are serially communicated on the analog switch. The method comprises (1) whether the two SIM cards belong to the same operator is judged; (2) if so, an SIM card is selected to obtain a cell parameter T3212 from a BCCH and the other SIM card obtains a cell parameter T3212 from the first SIM card; (3) if not, whether the periodic location updating parameters are identical is judged, if so, the step (2) is turned to, and if not, the periodic updating of the SIM card is carried out independently; (4) a timer is started by the SIM1 and the SIM2; (5) the location updating is independently started by the two SIM cards when the timer runs to overflow. When the periodic location region updating is achieved for the dual card dual standby mobile pone by the single GSM communication module, the application is convenient and the application range is wide.

The invention discloses a surface modification method for a polytetrafluoroethylene product. The method comprises the following steps of: coating polyethylene glycol on the surface of the polytetrafluoroethylene product, and then performing surface modification on the polytetrafluoroethylene product coated with the polyethylene glycol by adopting a plasma treatment method. Compared with the prior art, the polyethylene glycol element is introduced on the surface of the polytetrafluoroethylene product so as to effectively improve the surface activity of the polytetrafluoroethylene product, reduce the contact angle, improve the surface energy, remarkably improve the wetting property and the adhesion property of the polytetrafluoroethylene product and keep the polytetrafluoroethylene product for long time; and in addition, the method has little influence on the chemical property of the polytetrafluoroethylene product, has the advantages of convenient for operation, simple process, high processing speed, good treatment effect, low cost, energy conservation and emission reduction, is not easy to cause environmental pollution, and is more suitable for industrialized production.

The invention relates to a method for modifying the surface of carbon fiber coated with nano dioxide sol through plasma treatment, which comprises the following steps: firstly, nano silicon dioxide is prepared into an organic solvent, a sol solution of water or a sol solution prepared by hybridization reaction of a precursor solution of organic-inorganic nano particles and silicon dioxide nano particles by the ultrasonic vibrating technology; secondly, the sol solution is coated on the surface of the carbon fiber, treated by means of spray coating or padding and so on, and dried; and thirdly, the carbon fiber is placed on a plasma transport unit and a plasma is sprayed on the surface of the carbon fiber to generate modification, wherein the treating power is between 10 and 15,000 watts, and the treatment time is between 0.5 and 300 seconds. The method can effectively improve the performance of the carbon fiber, improves the molded manufacturability and the overall properties of composite materials of the carbon fiber, has simple technology, quick processing speed, good treatment effect and low cost, is convenient to operate and difficult to cause environmental pollution, can reduce energy consumption, and is suitable for industrial production.

The invention belongs to the field of graphene oxide films, and provides a controllable-interlamellar-spacing stable graphene oxide film which is prepared by accumulating partially reduced graphene oxide lamellae layer by layer or accumulating lamellae composed of graphene oxide and partially reduced graphene oxide layer by layer. The preparation method comprises the following steps: (1) uniformly dispersing the partially reduced graphene oxide in water, or uniformly dispersing the graphene oxide and partially reduced graphene oxide in water to form a film casting solution; and (2) filtering the film casting solution through a substrate film to form a wet-state graphene oxide film on the substrate film, putting the wet-state graphene oxide film together with the substrate film in a drying plant, drying, and peeling the graphene oxide film off the substrate film. The method can enhance the stability of the graphene oxide film in the water, acid solution or alkali solution on the premise of not blocking the interlamellar transmission channels of the graphene oxide film or destroying the accumulated lamellar structure.

The invention provides high-intensity high-hydroscopicity medical dressing containing carboxymethyl cellulose and a preparation method thereof. The method comprises the following specific steps: preparing carboxymethyl cellulose non-woven fabric through two steps of alkali added aqueous medium process; combining the obtained carboxymethyl cellulose non-woven fabric with a non-woven fabric to form a unit through needling, so as to prepare the high-intensity high-water absorbability medical dressing containing carboxymethyl cellulose. The dressing has the advantages that the substituted ratio of the prepared carboxymethyl cellulose non-woven fabric is controlled among 0.1-.05, and the substitution is uniform; the space physical adsorption property of the carboxymethyl cellulose non-woven fabric is kept, and meanwhile, the chemical adsorption performance is improved; the obtained carboxymethyl cellulose non-woven fabric and the non-woven fabric are compounded to a unit, which improves the dryness strength of the dressing prepared by the invention, beautifies the appearance, and improves the hand feeling. Besides, the method is simple and convenient in preparation technology and lower in cost.

The invention discloses a pulsed high magnetic field auxiliary laser welding method and device. The method and device can be applied to laser spot welding and seam welding. According to the method, in the overall welding process, laser beams are emitted to a workpiece to form a welding connector, a high pulsed magnetic field is exerted to the welding connector which is just solidified and the surrounding area, the pulsed magnetic field generates pressure stress on the surface of the workpiece to enable the connector area to have plastic deformation, residual stress is released to lower the degree of stress concentration and the degree of structural deformation of the welding connector, and the fatigue strength of the welding connector is improved. The device comprises a laser, a pulsed magnetic field generator, a numerical control system, an optical transmission system and a laser pulsed magnetic field composite processing head. The processing head is used for integrating the laser beams and the high pulsed magnetic field, and regulating the perpendicular distance between an electromagnetic conversion device and the surface of the workpiece and the horizontal distance between the electromagnetic conversion device and the laser beams. By means of the pulsed high magnetic field auxiliary laser welding method and device, structural deformation can be lowered, welding quality and processing efficiency are improved, and the processing effect which is superior to that of an existing laser welding process is achieved.

The invention relates to a method for preparing a graphene and inorganic salt high-temperature phase change composite material. The method comprises the following steps of: (1) preparing graphene sol; (2) preparing an inorganic salt solution, adding a surfactant, and mixing uniformly; (3) adding the graphene sol into the inorganic salt solution, and stirring until the graphene sol and the inorganic salt solution are mixed uniformly to obtain a composite material preform; (4) putting the composite material preform into an ultra-low-temperature freezer, quickly freezing to form a solid and taking out; (5) putting the solid-state composite material preform into a vacuum freezing dispersion drying instrument and drying; and (6) taking out after the drying of the composite material preform is finished, and calcining until the moisture is completely removed to obtain a grapheme / inorganic salt phase change composite material. Compared with the prior art, the method has the advantages that: the process is reasonable, easy to operate and low in cost; and the prepared grapheme / inorganic salt phase change composite material has the advantages of high coefficient of heat conductivity, high energy storage density and the like, has excellent performance, can meet different application requirements, and is suitable for industrialized production.

The invention discloses an embedded nerve stimulator with a constant voltage / constant current dipulse mode, belonging to the technical field of an embedded medical instrument. The embedded nerve stimulator provides a two-channel embedded never electric pulse stimulator for patients suffered from nerve system disease and can generate one or two electric pulse signals simultaneously, wherein the electric pulse signal(s) can be an electric pulse signals mode or a constant current pulse mode, and the two pulse modes can be switched by external program control equipment. The embedded nerve stimulator is characterized in that the embedded nerve stimulator mainly comprises a microcontroller, a pulse output circuit, a communication circuit, a power management circuit, a battery and the like. The embedded nerve stimulator has the constant voltage / constant current dipulse mode, so that the applicability problem of different application requirements can be solved, and the cure requirement of various system diseases can be met. The embedded nerve stimulator can be used for curing various nerve system diseases.

The invention provides a physiological signal remote monitoring system based on multimodal imaging technique and application thereof; the physiological signal remote monitoring system comprises an integrated imaging module, a hyperspectral imaging module and a control terminal; the hyperspectral imaging module is disposed above the integrated imaging module, and the integrated imaging module and the hyperspectral imaging module are respectively in communication connection with the control terminal. The physiological signal remote monitoring system integrating the 5 imaging modes of hyperspectral mode, visible light mode, near-infrared mode, far-infrared mode and laser bio-speckle mode can provide high-precision extraction and analysis for physiological signals; meanwhile, the physiological signal remote monitoring system allows coordinated data acquisition among multimodal devices and coordinated processing and analysis among data, such that the different application needs such as sleep monitoring and diseased pig screening are met.

The invention relates to the technical field of virtual network simulation, in particular to a simulation method and system for simulating a real network environment based on virtualization, electronic equipment and a storage medium. The simulation method comprises the following steps: starting to create a target range; setting basic information; setting topology information; creating resources; setting full-scene startup; storing the scene; and completing shoot range creation. According to the simulation method and system for simulating the real network environment based on virtualization, the electronic equipment and the storage medium, network attack and defense parameters such as a topological structure, the number of nodes and rule parameters can be configured according to needs; multi-mode drilling can be carried out to meet different application requirements, including red and blue confrontation, individual soldier drilling and equipment system verification; in the drilling process, the target range can support rapid deployment of different attack and defense scenes in the aspects of operation resources and management resources, so that safety evaluation is conducted on thetarget range in an omnibearing mode, and weak links are perfected in an emphasized mode.

The invention discloses an automatic solid grain sorting system which comprises a grain queuing device for sequentially transferring the solid grains and transmitting single grains to a signal collecting area, a signal collecting device connected with the grain queuing device and used for collecting information of the solid grains in the signal collecting area, an information processing device which is used for carrying out information processing on solid grain information data collected by the signal collecting device to judge the attributes of the grains and sending the attribute signals to a grain sorting device, and the grain sorting device connected with the information processing device and used for acquiring the attribute signals and sorting the solid grains according to the attribute signals.

The invention provides an unmanned aerial vehicle and a telescopic propeller arm component. The unmanned aerial vehicle comprises a machine body and telescopic propeller arm components; each telescopic propeller arm component is arranged on the outer side of the machine body and comprises a first propeller arm, a second propeller arm, a gear and a rack; each first propeller arm is fixedly connected with the corresponding gear; each second propeller arm is fixedly connected with the corresponding rack; and each gear is meshed with the corresponding rack, and each second propeller arm stretches relative to the corresponding first propeller arm through the corresponding rack when the gear rotates. With adoption of the unmanned aerial vehicle, the length of propeller arms can be regulated according to the use requirements to be matched with screw propellers in different specifications, so that different power efficacies are formed so as to meet different application needs.

The invention discloses a reconfigurable substrate integrated waveguide bandpass filter and a reconfigurable method of the filter and mainly solves technical problems that the tuning range is small, the insertion loss of reconfigurable substrate integrated waveguide bandpass filters is high and control voltage of variable capacitance diodes cannot be directly applied to substrate integrated waveguides. One variable capacitance diode is placed in a non-metal via hole formed in the center of each of two complementary split-ring resonators of the bandpass filter, the metal part at an inner ring opening of each complementary split-ring resonator is replaced with a blocking capacitor, so that a substrate integrated waveguide is separated from an outer circuit, and a voltage source is prevented from being short-circuited; the variable capacitance diodes are connected with a direct-current bias circuit, reversed bias voltage at two ends of the variable capacitance diodes is adjusted, junction capacity of the variable capacitance diodes is changed, so that the resonant frequency of the two complementary split-ring resonators is affected, and the passband center frequency is reconfigurable. The feeding manner of the variable capacitance diodes in the substrate integrated waveguide is realized, the control manner is simple and easy to implement, the frequency tuning range is relatively large, the in-band insertion loss is low, and the filter can be applied to a wireless communication system.

The invention discloses a negative temperature coefficient (NTC) material utilized at a high temperature, and a preparation method thereof. The NTC material comprises 2 to 10 wt% of La2O3, 5 to 20 wt% of ZrO2, and the rest of Ni0.6Mn1.8Al0.6O4. In the invention, oxides which comprise MnO2, NiO and Al2O3 and are traditional materials for preparation of NTC materials are utilized as base materials;a rare earth oxide La2O3 is added into the base materials to improve a stability of the base materials and reduce a ageing rate; and simultaneously, non-conducting ZrO2 is added into the base materials to improve a resistivity of the base materials and an activation energy thereby improving a constant B of the base materials. The NTC material can be utilized at a temperature more than 400 DEG C, and has a room temperature resistivity of 27900 to 64520 omega cm, a constant B of 4529 to 7895 K and a resistance drift rate of 0.6 to 2.3%.

The invention provides a transparent display panel and a display apparatus, relates to the display technical field, and solves the problem that a conventional transparent display panel can not meet the different display requirements of different areas. The transparent display panel comprises a plurality of display units, each including a light transmission subunit and a lighting subunit, wherein a lighting device is formed on the lighting subunit. The display panel comprises a first area and a second area, wherein the light transmittance of the display unit in the first area is greater than that of the display unit in the second area, and the luminance of the display unit in the first area is smaller than that of the display unit in the second area. The light transmittance of the display unit is the ratio of the area of the light transmission subunit of the display unit to the area of the display unit, and the luminance of the display unit is the ratio of the area of the lighting subunit of the display unit to the area of the display unit. The transparent display panel is applicable to a transparent display apparatus.

The invention discloses a method for preparing a gradient directional porous cement based on a two-phase pore former system freeze molding technology, and belongs to the technical field of porous material preparation methods. Cement powder is stirred and mixed with a mixed solution based on a two-phase pore former system to form a uniform system, and a gradient directional porous cement material is obtained through freeze forming, freeze drying and maintenance in sequence; the porous material structurally comprises directional macropores and interior mesopores, the pore size distribution is 3 nm to 400 microns, the porosity is 40% to 65%, and the porous material has the characteristics of uniform pore distribution, various open-framework structures and excellent directional degree. According to the method, the pore passage morphology of the prepared gradient directional porous cement is regulated and controlled by changing the proportion of tert butyl alcohol to water, so that different application requirements are met; moreover, the preparation technology is simple and convenient, relatively low in cost and simple and mild in maintenance conditions, the problem of style collapse cracking caused by a traditional high-temperature sintering method is avoided, and the method is more energy-saving and environmentally-friendly.

The invention relates to an ultrasonic-assisted microwave controllable preparation method of Cu2ZnSnS4 nano-particles and belongs to the field of inorganic materials. On the basis of optimizing the formula, the microwave power and the time of a reaction solution, controllable preparation of the Cu2ZnSnS4 nano-particles is realized through adjusting the ultrasonic power. As the performance of the nano-particles is greatly influenced by the shapes and the sizes of the nano-particles, the Cu2ZnSnS4 nano-particles in different shapes and sizes have different application values. The particles with the particle sizes smaller than 10 nm are Cu2ZnSnS4 quantum dots with better luminous performance, the nano-particles with bigger particle sizes can be used for preparing ink, the ink is then used for preparing a Cu2ZnSnS4 film serving as an absorbing layer of a solar cell, and the Cu2ZnSnS4 particles of which the particle sizes reach the quasi micron size can be used as an anode material of a lithium ion battery. Therefore, controllable preparation of the Cu2ZnSnS4 nano-particles is very important. The inexpensive and easy-to-implement method is adopted to successfully prepare the Cu2ZnSnS4 particles in different particle sizes and different shapes.

The invention discloses a construction system and method of a 3D (three-dimensional) micro / nano-scale prefabricated vessel network of bone tissues, which are used for the field of bio-manufacturing and used for manufacturing a micro / nano-scale prefabricated vessel access structure by combining an electrohydrodynamics direct-writing process and a subtractive manufacturing technology. A 3D shape of a required sacrificial material is prepared by promoting the sacrificial material to form sacrificial material solution with anhydrous ethanol, no harmful substance is generated in the whole process, and the material is easily available. The micro / nano-scale vessel structure is formed by virtue of printability of PVA (Polyvinyl Acetate), PGA (propylene glycol alginate) and chitosan, and the problem that the 3D micro / nano-scale vessel network cannot be obtained through biological 3D printing is solved, therefore, the system and the method have significance for solving the problem of the scale of a vessel in repair of human tissues in clinical medicine.

The invention relates to a wave-absorbing metamaterial comprising at least two metamaterial sheet layers which are overlapped together. Each metamaterial sheet layer comprises a first base plate and a second base plate arranged in an oppositive mode and a plurality of artificial microstructures which are arranged between the first base plate and the second base plate and in an array. Each of the artificial microstructures, the portions, corresponding to each artificial microstructure, of the first base plate and the second base plate are defined as one metamaterial unit. Each of the metamaterial sheet layers can be regarded as being formed by arranging the metamaterial units in an array mode. When electromagnetic waves enter the wave-absorbing metamaterial, by means of the coupling of the plurality of artificial microstructures, the incoming electromagnetic waves can be not reflected as much as possible and enter the inside of the wave-absorbing metamaterial to the maximum extent. In addition, high losses are produced by means of the resonance of the wave-absorbing metamaterial, so that the incoming electromagnetic waves can be attenuated rapidly in large amounts and transformed into heat energy or other energy and a good wave-absorbing effect is achieved. In addition, the electromagnetic waves which are not absorbed transmit out from the other side opposite to the incidence side of the electromagnetic waves, so that different application requirements are met.

A frequency-configurable oscillator circuit applied to a switching power supply is used for generating a clock control signal and a ramp signal required by a switching power supply circuit and is an on-chip circuit. The frequency-configurable oscillator circuit includes a work module identification circuit, a delay circuit, a synchronization module, a charging current control circuit, and an internal oscillator. The oscillator can automatically generate corresponding control signals through the change of external configuration. The oscillator works in three different work modes which includes a fixed output frequency, an adjustable output frequency, and an external clock synchronization frequency. The oscillator circuit has simple configuration mode and high reliability, suits various configurable oscillator occasions, and satisfies different application demands.

The invention discloses an ultra wide band four-tape circularly polarized antenna which comprises a metal floor (1), a dielectric substrate (2), a radiation patch (3), a feed branch node (4), a matching branch node (5) and a micro strip line feed source (6), wherein the radiation patch (3), the feed branch node (4) and the matching branch node (5) are printed on the positive surface of the dielectric substrate (2) and are electrically connected with the micro strip line feed source (6) as well as are of a shaft symmetric shaft; a T type groove (7) is etched on the metal floor (1) which is used as a radiation reflection plate of the radiation patch (3); the center of the radiation patch (3) is etched with a polarized hole (8), the edge of the polarized hole (8) is provided with two mutually orthorhombic gaps (9) and (10), an intersection point of the two gaps is coincident with the center point of the polarized hole (8); and the micro strip line feed source (6) is placed on the edge of the dielectric substrate (2). The invention can realize that wide band four-tape circularly polarization characteristic with a wide polarization band, and can be applied to satellite communication.

The embodiment of the invention provides a shift register unit and a driving method thereof, a gate drive circuit and a display device. The shift register unit comprises an input circuit, a first pull-up point, a second pull-up point, a sequential control circuit, a first output circuit, a second output circuit, a pull-down control circuit, a first pull-down circuit and a second pull-down circuit. The input circuit controls voltage of the first pull-up point. The sequential control circuit is coupled with the first pull-up point and the second pull-up point and is configured to control the voltage of the second pull-up point based on the voltage of the first pull-up point. The first output circuit controls voltage of the first output end. The second output circuit controls voltage of the second output end. The pull-down control circuit controls voltage of a pull-down point. The first pull-down circuit controls voltage of the first pull-up point. The second pull-down circuit controls voltage of the second pull-up point. The shift register unit can output multi-level gate drive signals and can regulate sequential relation between the gate drive signals.

The invention discloses a light-emitting diode (LED) array packaging light source module based on a lead frame. The LED array packaging light source module based on the lead frame comprises an LED chip, a radiating substrate, the lead frame, a support, a molding material, fluorescent powder, potting adhesive and a lens array, and is characterized in that the LED chip is installed on the radiating substrate through welding materials, silver paste and conductive adhesive, is connected with the lead frame through a bonding wire, and is fixedly installed on molding through the radiating substrate and the lead frame in a plastic package mode, wherein the radiating substrate and the lead frame are formed by stamping thin metal plates; and a lens or the lens array is fixed on a fixed clamping groove of the molding material. The LED array packaging light source module based on the lead frame has the advantages that the lead frame and the radiating substrate are formed by once stamping the thin metal plates, manufacturing process is simple, cost can be effectively reduced, radiating performance is good, junction temperature of the LED chip is effectively reduced, service life of the LED light source is prolonged, a lens fixing device on the molding material can effectively reduce the dangers that the lens and the lens array drops, and reliability of the LED light source module is improved.

The invention provides a multi-scale image segmenting method. The multi-scale image segmenting method comprises the following specific steps: (1) inputting an original image, pre-segmenting the original image, and establishing a normalized mean offset histogram of each pre-segmented region by a kernel density estimation method; (2) calculating to obtain color similarity values of two adjacent regions; (3) combining the regions to generate a binary tree; and (4) selecting nodes in the binary tree for performing image segmentation. By the multi-scale image segmenting method, the problems of excessive segmentation in the image segmenting process, easy influence of noises in an image on the segmenting method, and high complexity of the segmenting method are solved; and multi-scale segmenting results are helpful to improving working efficiencies of subsequent image analysis, image recognition and other advanced processing stages.

The invention discloses a Co-Zn-Cr-Al composite spinel type blue ceramic pigment which is expressed by a general formula (CoxZn1-x)(CryAl1-y)2O4, wherein x and y represents mole fractions; x is 0-1; y is 0-1; and when x and y are different in value, the products are different in color. Besides, the invention also discloses a preparation method of the Co-Zn-Cr-Al composite spinel type blue ceramic pigment. The ceramic pigment disclosed by the invention is small in particle size and uniform in distribution, has high coloration capability in glaze, and is high in coloration stability. Besides, the ceramic pigment is simple in preparation process and controllable in color and shape, and can meet different application requirements; and the whole process is easy to control and realize, and the product quality is stable, thereby being beneficial to large-scale popularization and application.

The invention discloses a compact plane branch coupler for a single-pass or double-pass band, and the compact plane branch coupler is provided with a main line and a secondary line both which are symmetrical about left and right sides, and a branch line which is symmetrical about upper and lower parts, both ends of the main line are respectively provided with an input end and a first isolation port, both ends of the secondary line are respectively provided with a second isolation port and a coupling port, and the branch line is arranged between the main line and the secondary line and connected with them. The compact plane branch coupler adopts a micro-strip structure and has the advantages of compact design, simple processing, low cost and easy integration; to the coupler based on the branch line structure, the main line and the secondary line adopt the equivalent structure of the uploaded open-circuit branch knot, convenient to be miniaturized; the bandwidth is increased by the cascade structures of two quarter-wavelength branch couplers; the coupler has better isolation more than 20dB; according to the actual demand, the coupler can be adaptively improved, and the electrical length of the branch line is adjusted to twice of that of the single-pass band coupler branch line such that the coupler can be operated in the double-pass band environment.

The invention discloses a double calibration treatment method based on a minimum weighted mean square error. According to the method, a minimum weighted mean square error (MWMSE) function for RCS double calibration measurement and treatment is defined; different weight factors are selected according to the same error function, and the weighted mean square error is minimized to meet different application requirements; when the weight factor averagely takes 1 which is namely the mean weight, the results can minimize the absolute error of RCS measurement calibration; when the weight factor takes the formula shown in the description (wi is the weight factor of the ith calibration body, the function in the absolute value sign in the formula shown in the description is the theoretical scattering function of the ith calibration body, and N is the number of measurement frequency points), the optimization results minimize the relative error of RCS measurement calibration; and for the RCS measurement of low-detectivity targets, the RCS level of the calibration body generally adopted is higher than the target RCS level in order to guarantee a sufficiently-high signal to clutter ratio. Under such conditions, the criterion of relative error minimum is beneficial for reducing the calibration error and improving the RCS measurement calibration precision.