781 results about "Coil structure" patented technology

The invention discloses a single-coil winding type four-eight-pole composite iron system for beam homogenization. The composite iron system comprises a composite magnet current control device, a composite magnet main power supply and four-pole / eight-pole composite iron, the quadrupole / octupole composite iron has eight pole heads, and only one type of excitation coil is wound on each pole head; the current value of the A-type excitation coil is an absolute value of a quadrupole magnetic field excitation current value plus an octupole magnetic field excitation current value; the current value of the B-type excitation coil is an absolute value obtained by subtracting an octupole magnetic field excitation current value from a quadrupole magnetic field excitation current value; the quadrupole / octupole composite iron is used for simultaneously generating a dominant quadrupole magnetic field and an octupole magnetic field, so that the effects of quadrupole iron and octupole iron can be simultaneously realized by only installing one transmission element; the excitation coil structure of the quadrupole / octupole composite iron composite magnet is improved, and only one excitation coil is wound on each pole head, so that the size of the coil structure can be reduced, and the construction cost is reduced.

The invention discloses an underground space time-shifting transient electromagnetic unmanned monitoring device and method. The underground space time-shifting transient electromagnetic unmanned monitoring device comprises a mobile platform, a multifunctional transient electromagnetic detection device and a ground remote control terminal, the multifunctional transient electromagnetic detection device can actively adjust the distance between a transmitting coil and a receiving coil so as to realize a mutual inductance eliminating 8-shaped coil structure, and through cooperation with a calibration algorithm of a control center, the automation level and reliability of detection are remarkably improved, and it is ensured that the 8-shaped coil is in a mutual inductance eliminating state. In addition, the transient electromagnetic monitoring device can perform structure switching between deep layer detection and shallow layer detection, so that a high-efficiency detection mode that one circle has two purposes is realized, and the efficiency and the flexibility of detection operation are remarkably improved. In the actual detection process, the advantages that the 8-shaped coil is small in shallow blind area and large in overlapped loop detection depth are fully played, advantage complementation of two coil modes is achieved, and comprehensiveness and accuracy of a detection result are remarkably improved through a data fusion mode.

The invention provides a preparation method of an HDMI (High Definition Multimedia Interface) high-performance common-mode suppressor made of a nanocrystalline material, relates to the technical field of electronic component preparation, and aims to meet the harsh requirement of HDMI high-frequency high-speed signals on common-mode noise suppression, the method comprises the following steps: constructing a multi-layer heterogeneous magnetic film with a gradient interface on a microstructured substrate by utilizing multi-target magnetron sputtering; a selective energy field assisted annealing technology is adopted to realize precise nanocrystallization and magnetic anisotropy regulation and control of the magnetic film; and a high-precision three-dimensional coil structure is integrated by combining a micromachining process. The prepared common-mode suppressor is small in size and high in integration level, shows excellent common-mode suppression efficiency, wide working bandwidth and excellent signal integrity in a high-frequency band, has high reliability, and is suitable for a new generation of HDMI (High-Definition Multimedia Interface).

The invention discloses a wireless power transmission coil optimization method and a related system, which can realize automation of coil structure parameters and multi-target global optimization by acquiring a coil geometric parameter space, constructing a comprehensive optimization function and performing iterative search in the coil geometric parameter space. The problems that in traditional design, the number of simulation iterations is large, design efficiency is low, local optimum is prone to occurring, and multiple performance indexes are difficult to balance are effectively solved, coil design efficiency and precision are remarkably improved, and dependence on artificial experience is reduced. Therefore, the number of manual intervention and simulation is remarkably reduced, the coil design efficiency is improved, and the prototype development period of the WPT system is shortened. Besides, iterative search is carried out in the parameter space, so that the whole design space can be effectively explored, a locally optimal solution trap can be jumped out, and a globally optimal or approximately globally optimal coil structure parameter combination can be obtained more possibly.

The invention discloses a frequency mixing sound demodulator based on a curled structure and a use method thereof in the acoustics field, the demodulator is used for separating frequency mixing sound mixed by a plurality of sound waves with preset frequencies according to respective frequencies, and the demodulator comprises an air waveguide for transmitting the sound waves, and blocking structures arranged on two sides of the air waveguide for blocking the sound waves from penetrating, and a plurality of curled structures that capture corresponding preset frequency sound waves; curled structures are arranged in the barrier structure on at least one side of the air waveguide at intervals, one end of each curled structure is open, and the other side is closed; a plurality of cross beams for blocking penetration of sound waves are arranged in each curled structure, and an internal channel of each curled structure is divided into different lengths to serve as different acoustic resonant cavities so as to capture the sound waves with different frequencies; the closed end of each curled structure is a detection end of each preset frequency sound wave. The invention solves the problem that the existing method is difficult to instantly separate the frequency mixing sound signal and carry out information transmission.

The invention discloses a coil structure-based length self-sensing method for high polymer twisted artificial muscle, which comprises the following steps of: firstly, enabling the artificial muscle to be equivalent to N equidistant circular current loops, establishing an inductance calculation formula by combining a Biot-Savart law and a magnetic field superposition principle, and breaking through the limitation of a traditional solenoid model on a helical angle; then through MATLAB numerical simulation and iterative computation, fitting to obtain a power function describing the relation between inductance and length; and finally, proposing a parameter dynamic correction mode based on single-time initial inductance measurement according to complex factors such as actual magnetic flux leakage and skin effect, and realizing rapid adaptive calibration by adjusting a parameter b. In a word, the method creatively combines theoretical modeling with experimental correction, the sensing precision in a dynamic stretching scene is remarkably improved while the inductance-length macroscopic trend prediction capability is ensured, dependence on a large amount of experimental data is not needed, and the method has good engineering applicability and is worthy of popularization.

The invention discloses a magnetic field chip design method based on a genetic algorithm, and the method comprises the steps: setting genetic algorithm parameters, and setting magnetic field chip target parameters according to actual application demands; generating an initial population, wherein the initial population is a plurality of groups of individuals containing coil parameters; checking constraint conditions of the individuals, wherein the constraint conditions comprise physical constraints and design constraints; the power consumption generated by the coil structures corresponding to the individuals meeting the constraint conditions serves as a fitness function, and the fitness of all the individuals in the current population is evaluated; and judging whether a termination condition is met or not, outputting an individual with the optimal fitness as an optimal combination of coil parameters under the target parameters of the magnetic field chip when the termination condition is met, otherwise, generating a next-generation population, and repeatedly carrying out constraint condition check and fitness evaluation until the termination condition is met. According to the method, the magnetic field chip with the minimum power consumption meeting the magnetic field target can be designed, the design time of the magnetic field coil is greatly shortened, and the design rapidity and flexibility are improved.

The present application relates to the technical field of power devices, and particularly discloses a resonant leakage inductance transformer for a plate-type ozone generator, comprising: insulating bobbins, two insulating bobbins being longitudinally provided, a primary coil structure and a secondary coil structure being respectively provided on the insulating bobbins in the circumferential direction, and the two insulating bobbins being longitudinally aligned and fixed; magnetic cores, each magnetic core comprising a plurality of protruding portions, the protruding portions extending in the longitudinal direction, the plurality of protruding portions being arranged in a single transverse row, and the protruding portions located in the middle in the arrangement direction respectively longitudinally passing through the middle of the two insulating bobbins; and an insulating fixing frame, the magnetic cores being arranged in the insulating fixing frame. The primary coil structure and the secondary coil structure are each of a multi-layer wound coil structure, and ceramic tubes are inserted between adjacent layers of coils of the coil structure.

The invention provides an anti-offset magnetic coupling mechanism for a wireless charging system of an unmanned aerial vehicle, the magnetic coupling mechanism comprises a transmitting end arranged on a landing platform and a receiving end mounted on the unmanned aerial vehicle, and a transmitting coil is a double-layer circular coil wound at gradient intervals; an axial magnetic field which is uniformly distributed is formed through a non-uniform distribution structure of coil turn spacing; the receiving end is composed of four sets of same magnetic core-coil structures, each set is composed of a lightweight cylindrical novel soft magnetic composite material magnetic core and an externally-wound solenoid coil of a vertical landing gear of the unmanned aerial vehicle, the magnetic cores are located in the vertical landing gear of the unmanned aerial vehicle, and the coils of the four magnetic core-coil structures are closely wound in the axial direction of the outer surface of the landing gear and connected in series. And coil and magnetic core parameters are designed by using an evolutionary algorithm. The problems that in a traditional scheme, the anti-offset capacity is weak, the magnetic core weight is large, and the receiving end is not matched with the special-shaped structure of the unmanned aerial vehicle are solved, and the method is suitable for unmanned aerial vehicle wireless charging scenes.

The invention relates to a radio frequency coil design method for transmitting array space coding imaging, and belongs to the technical field of magnetic resonance imaging. Aiming at the problems of low single-dimensional coding efficiency, strong coupling interference among coils and nonlinear phase gradient in the traditional TRASE technology, axial and radial coding coils are designed based on a target field method and a magnetic dipole method, two-dimensional radio frequency phase coding is realized through reverse current solenoid decoupling combination, and excitation and signal receiving are realized in combination with a saddle-shaped coil. According to the technical scheme, by optimizing the coil structure and the decoupling design, multi-dimensional efficient coding, high-precision phase gradient, strong anti-interference and light system weight are achieved, and the method is suitable for portable and dynamic monitoring scenes of low-field magnetic resonance.

The utility model provides a magnetic element and a topological structure used for an interleaving flyback converter, and relates to the technical field of power electronics, and the magnetic element comprises a magnetic core structure and a coil structure. The magnetic core structure comprises an upper magnetic core base, a lower magnetic core base, N magnetic core middle columns and at least one side column, wherein the upper magnetic core base and the lower magnetic core base are oppositely arranged, the N magnetic core middle columns and the at least one side column are arranged between the upper magnetic core base and the lower magnetic core base, and N is a natural number larger than 1. The coil structure comprises N coils wound on the magnetic core middle columns respectively, the winding directions of the coils on the adjacent magnetic core middle columns are opposite, and an air gap is formed in at least one of the three positions including the position between the upper bottom face of each magnetic core middle column and the upper magnetic core base, the position between the lower bottom face of each magnetic core middle column and the lower magnetic core base and the side face of each magnetic core middle column. According to the magnetic element, the magnetic core columns are integrated on the same magnetic core base, and the winding directions of the coils of the adjacent magnetic core middle columns are opposite, so that the purposes of reducing the weight of the magnetic core and reducing the loss of the magnetic core can be achieved.

The utility model relates to the technical field of electronic expansion valves, in particular to a coil structure and an electronic expansion valve. The coil structure comprises a stator assembly, a wire assembly and a wire fixing frame, wherein the stator assembly comprises a framework and a plurality of contact pins connected to the framework; the wire assembly comprises a plurality of leads and an outer coating layer, the outer coating layer wraps the peripheries of the leads, and the leads are electrically connected with the contact pins. The wire fixing frame comprises a limiting part, and the limiting part surrounds at least part of the peripheral side of the wire assembly and is used for limiting the position of the wire assembly relative to the stator assembly. According to the coil structure and the electronic expansion valve, the problem that the wire sealing performance of an existing electronic expansion valve coil structure is poor due to wire movement is solved.

A switch device includes a circuit board, a coil structure, a lower cover, an upper cover, an elastic part, and a sliding part. The circuit board gas a through hole running through the circuit board. The coil structure is disposed on the circuit board and surrounds the through hole. The lower cover us located over the coil structure. The upper cover is disposed on the lower cover. The lower cover and the upper cover form an accommodating space. The elastic part is located in the accommodating space. The sliding part passes through an opening of the upper cover and is configured to slide relative to the lower cover along a direction. The sliding body is configured to drive the sliding part to pass through the through hole along the direction to generate a switch signal corresponding to an inductance variance of the coil structure.

A resin film (100) comprising a core layer (2) and adhesive resin layers (1) which are respectively provided to both sides of the core layer (2), wherein: the adhesive resin layers (1) each comprise an adhesive resin composition that contains an epoxy resin; the dielectric breakdown strength of a cured product of the adhesive resin composition is not less than 300 kV / mm; the core layer (2) comprises a polyimide film; and the dielectric breakdown strength of the polyimide film is not less than 300 kV / mm.

The invention discloses a design method of a multistage nested Helmholtz coil system, and relates to the technical field of general instrument and meter manufacturing. According to the reciprocal analysis design method for the coil structure parameters and the magnetic field characteristics of the multistage nested Helmholtz coil system under the global sensitivity, the optimal design expression of each design parameter of the multistage nested Helmholtz coil system can be determined based on the reciprocal analysis design method, and the multi-parameter expression of the magnetic field characteristics can be obtained; the coil parameter design priority is defined, and an optimization design strategy for the magnetic field design indexes is provided. When a macroscopic design requirement of a target uniform magnetic field is provided, an optimal solution of each design parameter of the multistage nested Helmholtz coil system can be directly obtained. According to the method, the Helmholtz coil can be efficiently and accurately improved and designed according to needs.

The invention discloses a vacuum arc extinguish chamber structure with large rated current and strong breaking capacity, which comprises a structure body, and is characterized in that the structure body comprises a static contact assembly, the static contact assembly comprises a static end arc contact and a static end main contact, and the static end arc contact is arranged in front of the static end main contact and protrudes for a preset distance d along the on-off direction; and the moving contact assembly comprises a moving end main contact and a moving end arc contact, and the moving end main contact and the moving end arc contact are located on the same plane. According to the invention, the effect that the main contact does not burn arc during breaking is realized, the contact surface of the main contact is protected from being ablated by the arc, and a physical foundation is laid for the high capacity of the vacuum arc-extinguishing chamber. The moving end arc contact is provided with a coil structure so as to generate a transverse magnetic field or a longitudinal magnetic field, and the magnetic lines of force between the static end arc contact and the moving end arc contact have the combined action of the longitudinal magnetic field and the transverse magnetic field, so that the breaking capacity is high.

The utility model discloses a laminated chip inductor, which comprises a main body and an outer electrode, the outer electrode is arranged on the outer surface of the main body, the main body comprises a plurality of conductor layers and an insulating layer, the plurality of conductor layers are laminated, and two adjacent conductor layers are isolated by the insulating layer. The conductor layer comprises a middle wire part and a leading-out part, the middle wire part is communicated with the outer electrode through the leading-out part, the leading-out part comprises a coil structure and at least two leading-out ends, and the width sum of the leading-out ends is 15%-40% of the width or length of the laminated chip inductor. By adopting the structure with multiple leading-out ends, the open circuit condition caused by ablation of the leading-out parts or change of internal stress of the inductor is effectively reduced, and the overall reliability and durability of the inductor are improved.

The present invention relates to an eccentric conical head gradient coil and its design method, including: setting the structure and size of the conical coil, discretizing the current-carrying surface of the conical coil structure into a grid composed of triangles, and calculating the current basis functions of the nodes of each triangle; moving the imaging region a set distance towards the coil inlet end, selecting the magnetic field sampling points in the imaging region, and calculating the target magnetic field values at the magnetic field sampling points; expressing the magnetic field component in the Z direction at the magnetic field sampling points with the node stream function values and the current basis functions; combining the target magnetic field values at the magnetic field sampling points and the magnetic field component in the Z direction, constructing an optimization problem with the minimization of the coil power consumption as the optimization objective and the linearity of the magnetic field in the imaging region as the constraint condition; solving the optimization problem to obtain the stream function distribution of the coil; and using the stream function method to discretize the wire to obtain the winding distribution of the coil. The present invention has the advantages of higher current efficiency, greater openness, and the ability to reduce the local hot spot temperature, etc.

The invention provides a transformer dynamic thermal field prediction and active cooling control method based on digital twinning, and relates to the technical field of intelligent control of power equipment. Comprising the following steps: extracting key parameters of a to-be-tested transformer, and simplifying a three-dimensional coil structure into a two-dimensional axisymmetric rotation model according to the key parameters; setting calculated excitation, boundary conditions and calculation frequency for the two-dimensional axisymmetric rotation model so as to carry out magnetic field calculation to obtain a corresponding ohmic loss value; fitting the corresponding ohmic loss values into a temperature-related function to obtain a loss temperature function; determining a training set for constructing a digital twinborn model according to the loss temperature function and the input parameters; constructing a digital twinborn model according to the training set; and carrying out transformer temperature prediction and regulation and control by using the digital twin model. The problems that in the prior art, a traditional temperature measurement means has hysteresis in recognition of hidden hot spots, and advanced suppression of thermal risks cannot be achieved are solved.

According to the three-axis high-uniformity magnetic field coil design method based on the improved multi-target grey wolf algorithm, ideal modeling is conducted on a coil, a magnetic field expression generated by the coil is deduced through the Biot-Savart law and magnetic field superposition, and the multi-target grey wolf algorithm is directly used for optimizing coil parameters for the first time; and constructing an optimization objective function according to a Taylor expansion coefficient of the magnetic field expression and a coil structure constraint condition. Compared with traditional equation solution or manual setting of weight parameters for each optimization target by using an optimization algorithm in a single-target form, the method does not need to set proper parameters for each optimization target under the condition that a high-order equation has no solution or is determined by repeated tests, and reduces the calculation difficulty and tedious operand. Meanwhile, the initialization mechanism and the convergence factor of the original multi-target grey wolf algorithm are improved, the quality of the final solution is improved, and finally the finished three-axis high-uniformity magnetic field coil is manufactured by using the flexible printed circuit technology. The three-axis uniform magnetic field coil is designed by using the algorithm for the first time.

An inductively-coupled plasma (ICP) generation system may include a dielectric tube, a first inductive coil structure to enclose the dielectric tube, an RF power supply, a first main capacitor between a positive output terminal of the RF power supply and one end of the first inductive coil structure, and a second main capacitor between a negative output terminal of the RF power supply and an opposite end of the first inductive coil structure. The first inductive coil structure may include inductive coils connected in series to each other and placed at different layers, the inductive coils having at least one turn at each layer, and auxiliary capacitors, which are respectively provided between adjacent ones of the inductive coils to distribute a voltage applied to the inductive coils.

The utility model relates to a radio frequency coil assembly for magnetic resonance scanning equipment and the magnetic resonance scanning equipment. The radio frequency coil assembly comprises a first coil structure and a second coil structure, the first coil structure can be worn on a scanning part of a detected object, and the size of the first coil structure can be matched with the size of the scanning part, so that the first coil structure is closer to and fits the scanning part, and magnetic resonance signals emitted by tissues can be received more efficiently; a higher image signal-to-noise ratio is obtained; the second coil structure is separated from the first coil structure and surrounds the outer side of the worn first coil structure, and a certain gap is formed between the second coil structure and the first coil structure, that is, the size of the second coil structure can be made to be larger, so that the device can adapt to detected objects with more body types, and the proportion of applicable people is increased; and moreover, the problem of claustrophobia of the detected object can be relieved, the comfort of the detected object is improved, and the use is more convenient.

The application provides a coil module, an electronic device and a wireless charging system, and relates to the technical field of wireless charging, and aims to solve the problem that the thickness of the wireless charging coil module is relatively large, which is not conducive to the arrangement of other functional devices in the electronic device. The coil module comprises a coil structure; the coil structure comprises a functional layer; along the thickness direction of the coil structure, the functional layer comprises a first wiring sublayer, a second wiring sublayer and an insulating sublayer located between the first wiring sublayer and the second wiring sublayer; the coil structure further comprises a first end, a second end and a plurality of groups of coils connected in series; the first end and the plurality of groups of coils are arranged on the first wiring sublayer, and the outermost group of coils is connected to the first end; the second end is arranged on the second wiring sublayer; a via hole is arranged on the insulating sublayer, and a connecting structure is arranged in the via hole; the innermost group of coils is connected to the second end through the connecting structure in the insulating sublayer, so that the first end is electrically connected to the second end through the plurality of groups of coils connected in series.

The utility model provides a plasma etching device, which is characterized in that a gas supply structure introduces process gas into a branch gas inlet structure in a process cavity through a branch pipeline, and the branch gas inlet structure is provided with gas orifices; and the second ICP coil structure is provided with more than two control branch coils with independently adjustable radio frequency power and a bearing structure which is fixed below the branch air inlet structure and is used for bearing the control branch coils. According to the utility model, the plasma density at the edge of the wafer is finely adjusted by adjusting the radio frequency power of each control sub-coil, so that the plasma etching uniformity at the edge of the wafer is improved; meanwhile, a plug and a switch structure in the branch air inlet structure are matched to adjust the plasma etching uniformity of the edge of the wafer; in addition, the angle adjusting structure adjusts the angle of the air injection surface, and the adjusting freedom degree of the wafer edge plasma density is improved; and finally, the central symmetry distribution of the branch coils and the air injection holes is controlled to adapt to the hot spot area distribution needing to be adjusted for the wafer edge plasma etching uniformity, and the wafer edge plasma etching uniformity is further improved.

The utility model discloses a plasma processing device. The plasma processing device comprises a vacuum chamber and a base positioned in the vacuum chamber, the dielectric window is positioned at the top of the vacuum chamber and is opposite to the base; the coil is at least partially positioned above the dielectric window and comprises at least two lengthwise excitation sections; the radio frequency power supply is used for applying radio frequency signals to the coil, so that the current directions of the two excitation sections are the same, and the rotary driving device is used for driving the coil and / or the base to rotate, so that the coil and the base can rotate relatively in the technological process. The coil structure provided by the utility model can improve the distribution uniformity of an electromagnetic field and the utilization efficiency of a radio frequency power supply.

The invention discloses a cylindrical material conveying device based on a horizontal linear motor, and belongs to the field of mechanical design and manufacture, the device comprises a magnetic flux switching linear motor, a stator supporting device, a material supporting device, a material pushing device and a sensor device, and the magnetic flux switching linear motor is a driving source and is of a horizontal bilateral structure; the reinforcing ribs in the stator supporting structure adopt a dual-function coupling design, so that the cost can be reduced and the efficiency can be improved; the material supporting device is fixedly connected with the stator supporting structure and is in linear contact with the cylindrical material; the pushing device is fixedly connected with the linear motor rotor and is connected with the stator supporting structure through a linear guide rail sliding block; the sensor device is located on one side of the linear motor, and a signal line is of a spring coil structure. The rotor is simple in structure, easy to maintain, good in natural heat dissipation effect, compact in overall structure and high in space utilization rate, and the problems that an existing same-type cylindrical material conveying device is complex in rotor structure, poor in natural heat dissipation effect and low in overall structure space utilization rate are solved.

The invention relates to the technical field of electromagnetic coils, in particular to a Halbach array planar coil structure unit. The Halbach array planar coil structure unit is composed of a first substructure, a second substructure and a third substructure. According to the invention, a planar electromagnetic coil is adopted to form a Halbach array permanent magnetic field effect; the invention discloses a Halbach array permanent magnet structure, and aims to solve the problems that the existing Halbach array permanent magnet structure is difficult to miniaturize and rigid, cannot get rid of the limitation of permanent magnet materials, is difficult to realize a sine distribution magnetic field in a real sense and is low in electromagnetic utilization rate.

A leg control mechanism of a tendon-imitating driving robot comprises at least one rotary driving device and at least one leg support structure, the rotary driving device is arranged at one end of the leg support structure, and an output wire coil structure is rotationally installed at the other end of the leg support structure and used for being connected with a driven control piece. A transmission wheel disc structure is arranged at the output end of the rotation driving device, a transmission line driving structure is arranged between the output wire coil structure and the transmission wheel disc structure in a sleeved mode, and the transmission line driving structure forms a tightened loop state between the output wire coil structure and the transmission wheel disc structure. The driving device has the advantages of extremely high flexibility and elaborate performance, high control stability and precision, large driving torque, capability of avoiding fatigue fracture, and prolonged service life.

The invention discloses a high-tone-quality low-energy-consumption long-service-life automobile electric horn which comprises an iron cover assembly composed of an iron cover, a static iron core and a coil structure, a sounding assembly composed of a sounding diaphragm and a movable iron core, and a rolling part formed by bending the peripheral edge of the sounding diaphragm. The rolling part is wrapped and fastened on the outer side of the edge of the iron cover through an edge covering and riveting process, so that the iron cover assembly and the sounding assembly are assembled into an integral upper assembly in a riveting manner, a lower assembly is assembled through the horn and the mounting bottom plate, and the upper assembly and the lower assembly form the electric horn assembly through a buckling and pressing structure. By means of the installation design, parts such as plastic rings and bolts needed by traditional screw connection or welding are omitted, the assembly complexity is reduced, the installation structure is simplified, automatic production is easy, cost is reduced, the overall weight of the product is reduced, and reliable sealing performance, anti-rust performance and structural rigidity are obtained; and the structural stability, the acoustic performance and the long-term working reliability of the product are improved.

The invention discloses a voltage-controlled oscillator and a sub-sampling phase-locked loop, and relates to the technical field of phase-locked loops. The voltage-controlled oscillator comprises two negative resistance transistors and a three-layer coil structure; the three layers of coil structures are respectively a drain coil, a grid coil and a source coil from outside to inside; the gate coil and the drain coil are both of an octagonal structure, and the source coil is of a splayed structure; the drain coil, the source coil and the grid coil are all provided with center taps, the center tap of the source coil is connected with a power voltage module, the center tap of the drain coil is grounded, and the connection point of the center tap of the source coil and the power voltage module and the connection point of the center tap of the drain coil and the ground are located on the same side of the drain coil. And the two negative resistance transistors are positioned on the other side of the drain coil. According to the invention, automatic alignment of second harmonics in a wide frequency range is realized. And meanwhile, an extra chip area is not increased.