阅读说明：本技术 基于3d打印的四路高功率微波合成器制造方法和合成器 (Four-path high-power microwave synthesizer manufacturing method based on 3D printing and synthesizer ) 是由 肖龙 陈俊峰 郭文菁 杨萌 郭龙颖 于 2019-11-30 设计创作，主要内容包括：本发明提供了基于3D打印的四路高功率微波合成器制造方法和合成器,根据电磁耦合波理论推导耦合度的强弱与波导半径、微波频率、微波模式和缝宽的关系,采用时域有限差分算法对合成器建模并根据耦合波理论进行仿真,最后通过3D打印一次成型合成器,制造了高合成效率的四路高功率合成器,实现合成多个不同频段的微波源输出的微波和共天线向外辐射的功能；即在扩展系统输出微波频段的同时,提高了微波的合成效率和输出总功率。本发明采用的3D打印技术一次成型地制造四路高功率合成器,有效解决了传统方法制造合成器的打火问题,应用于输出功率为MW量级微波毫米波源的HPM辐射系统。(The invention provides a method for manufacturing a four-path high-power microwave synthesizer based on 3D printing and a synthesizer, which are characterized in that the relation between the strength of coupling degree and waveguide radius, microwave frequency, microwave mode and slit width is deduced according to an electromagnetic coupling wave theory, a finite difference algorithm of a time domain is adopted to model the synthesizer and simulate the synthesizer according to the coupling wave theory, and finally, the four-path high-power synthesizer with high synthesis efficiency is manufactured by printing the synthesizer once through 3D, so that the function of synthesizing microwaves output by microwave sources of a plurality of different frequency bands and radiating outwards by a common antenna is realized; namely, the synthesis efficiency and the output total power of the microwave are improved while the microwave frequency band output by the system is expanded. The four-path high-power synthesizer is manufactured in a one-step forming mode through the 3D printing technology, the ignition problem of the synthesizer manufactured by the traditional method is effectively solved, and the four-path high-power synthesizer is applied to an HPM radiation system with the output power being MW-magnitude microwave millimeter wave sources.)

1. A manufacturing method of a four-path high-power microwave synthesizer based on 3D printing is characterized by comprising the following steps: the method comprises the following steps:

s1: deducing the relationship between the strength of the coupling degree and the waveguide radius, the microwave frequency, the microwave mode and the slit width according to an electromagnetic coupling wave theory, analyzing the coupling mechanism of the four-way synthesizer, and giving an optimal mode and an optimal matching mode;

s2: modeling the synthesizer by adopting a finite difference time domain algorithm and simulating according to a coupled wave theory;

s3: and (4) manufacturing a physical model of the synthesizer by 3D printing one-step forming.

2. The 3D printing-based four-way high-power microwave synthesizer manufacturing method according to claim 1, characterized in that: in the step S1, the specific steps are as follows:

s11: the two continuous long-slit coupling structures comprise two back-to-back circular waveguides, namely a waveguide 1 and a waveguide 2, the two waveguides are the same in physical size, a continuous coupling slit with the length of z is formed between the two waveguides, ports 1 and 2 are arranged on two sides of the waveguide 1 respectively, ports 3 and 4 are arranged on two sides of the waveguide 2 respectively, the ports 1 and 4 are on the same side, and the ports 2 and 3 are on the same side; the waveguide 1 is a sub-waveguide, the waveguide 2 is a main waveguide, and a single-mode initial excitation a is input to the port 1₁(0) The signal input to the port 4 is zero, and the propagation constants of the electromagnetic wave are β, β for the propagation constants in the waveguide 1 and the waveguide 2, respectively₀₁And β₀₂According to the coupled wave theory, for a single mode, the condition that the fixed phase shift coefficients of the waveguide 1 and the waveguide 2 are equal, that is, the synchronous condition that microwaves in the same mode are transmitted in the same direction in the two waveguides is as follows:

β₀₁＝β₀₂＝β；

for the fixed mode, let k be the coupling coefficient between waveguide 1 and waveguide 2₁₂And k₂₁The same direction of the coupled wave satisfies

The group velocity propagation constant β of the electromagnetic wave_eIs composed of

Voltage signal a in waveguide 1 and waveguide 2₁(z) and a₁(z) as a function of the coupling gap length z

a₁(z)＝a₁(0)cosβ₀₂ze^-jβz，

a₂(z)＝a₁(0)sinβ₀₂ze^-jβz；

The microwave is transmitted along the z direction, i.e. the length direction of the waveguide, the microwave power in the waveguide 1 and the waveguide 2 are respectively

If the length z of the coupling slot is l and the specific length satisfying the resonance condition is l, then:

the output end of the waveguide 2 has microwave output:

[a₂(l)]²＝[a₁(0)]²，

while the output end of the waveguide 1 has no power output:

[a₁(l)]＝0，

the energy is coupled into the main waveguide by the secondary waveguide; that is, if a single mode of microwave is input from port 1 of the sub waveguide, output from port 3 of the main waveguide is realized under the condition that the relevant conditions are satisfied. According to the reciprocal principle, if the microwave mode injected from the port 4 of the main waveguide is the same as that of the auxiliary waveguide, the microwave in the row is coupled into the auxiliary waveguide and output from the port 2;

s12: according to the polarized orthogonally coupled wave theory, circular waveguidesThe mode is divided into a horizontal polarization state and a vertical polarization state if the coupling structure satisfies

3. The 3D printing-based four-way high-power microwave synthesizer manufacturing method according to claim 2, characterized in that: in the step S2, the specific steps are as follows:

s21: modeling the synthesizer by adopting a finite difference time domain algorithm;

s22: and respectively arranging electromagnetic wave sources with different frequencies, powers, polarizations and incident wave vectors at each port of the synthesizer, and simulating according to a coupled wave theory to obtain the waveguide size and the material output result under different parameters.

4. The 3D printing-based four-way high-power microwave synthesizer manufacturing method according to claim 3, characterized in that: in the step S3, the specific steps are as follows:

s31: preprocessing according to the model, and calculating the positions of the photosensitive resin and the supporting material;

s32: jetting fine photosensitive resin liquid drops through a 3D printer and curing through ultraviolet rays to enable a material thin layer to be gathered on a building tray to form a 3D model and parts;

s33: and removing the supporting material after printing is finished.

5. The 3D printing-based four-way high-power microwave synthesizer manufacturing method according to claim 4, characterized in that: between steps S2 and S3, the following steps are further included: and according to the simulation result, manufacturing a four-way synthesizer by using a traditional machining method, testing the synthesis effect by matching with a backward wave tube, and continuously optimizing parameters by comparing the simulation result.

6. Synthesizer based on the 3D printing based four-way high power microwave synthesizer manufacturing method of any one of claims 1 to 5, characterized in that: the device comprises an input section, a coupling section and an output section which are connected in sequence, wherein the input section is not less than four;

the input section comprises a main channel and an auxiliary channel, the main channel is a straight section circular waveguide, and the auxiliary channel is a circular waveguide with a rotating shaft bent by 90 degrees; the input section is used for injecting microwaves;

the coupling section comprises two back-to-back circular waveguides with the same overall dimension, one circular waveguide is a main waveguide, the other circular waveguide is an auxiliary waveguide, and a continuous long slit is arranged between the main waveguide and the auxiliary waveguide; the coupling section is used for coupling microwave energy into the main waveguide from the secondary waveguide;

the output section comprises at least four back-to-back circular waveguides, wherein one of the four back-to-back circular waveguides is a long waveguide, at least three of the four back-to-back circular waveguides are short waveguides, the short waveguides are connected with the auxiliary channel through the auxiliary waveguide, and the long waveguides are connected with the main channel through the main waveguide and are the common output end of the synthesizer; the output section is used for outputting microwaves.

7. The synthesizer according to claim 6, wherein: the connection surface of each part of the synthesizer is carved with the seal groove for satisfy the condition that uses under high vacuum environment.

Technical Field

The invention belongs to the technical field of high-power microwave synthesis, and particularly relates to a four-path high-power microwave synthesizer manufacturing method based on 3D printing and a synthesizer.

Background

High-Power Microwave (HPM) generally refers to electromagnetic waves with peak Power greater than 10MW and frequency between 1GHz and 300 GHz. The high-power microwave has wide application in the aspects of directional energy devices, high-power radars and the like.

In order to achieve higher pulse powers or pulse repetition frequencies, it is necessary to explore and study the HPM synthesis technology. If two HPM sources exist and the working frequency ranges are the same, if the HPM generated by the two HPM sources is to be radiated at the same time, two sets of antennas matched with the HPM sources are required to be developed; the cost of the equipment can be greatly reduced if the HPMs generated by the two HPM sources can be synthesized in the waveguide and then radiated by the same antenna. This synthesis is not power synthesis in the usual sense but pulse width synthesis or pulse repetition frequency synthesis, i.e. two HPM paths are implemented fed in by two ports and one output by one port.

With the development of high-power microwave technology, high-power microwave systems with multiple-band output characteristics and higher output power levels are increasingly emphasized, and the transmission subsystem is one of the key components, so that the scheme selection of the system is determined to a great extent. However, most of the mature high-power microwave sources currently work in a single frequency band, and the output power has physical limits.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: the four-path high-power microwave synthesizer manufacturing method and synthesizer based on 3D printing are provided, a four-path high-power synthesis module with high synthesis efficiency is manufactured, and the functions of synthesizing microwaves output by microwave sources in different frequency bands and radiating outwards by a common antenna are achieved.

The technical scheme adopted by the invention for solving the technical problems is as follows: a manufacturing method of a four-path high-power microwave synthesizer based on 3D printing comprises the following steps:

s1: deducing the relationship between the strength of the coupling degree and the waveguide radius, the microwave frequency, the microwave mode and the slit width according to an electromagnetic coupling wave theory, analyzing the coupling mechanism of the four-way synthesizer, and giving an optimal mode and an optimal matching mode;

s2: modeling the synthesizer by adopting a finite difference time domain algorithm and simulating according to a coupled wave theory;

s3: and (4) manufacturing a physical model of the synthesizer by 3D printing one-step forming.

According to the scheme, in the step S1, the specific steps are as follows:

s11: the two continuous long-slit coupling structures comprise two back-to-back circular waveguides, namely a waveguide 1 and a waveguide 2, the two waveguides are the same in physical size, a continuous coupling slit with the length of z is formed between the two waveguides, ports 1 and 2 are arranged on two sides of the waveguide 1 respectively, ports 3 and 4 are arranged on two sides of the waveguide 2 respectively, the ports 1 and 4 are on the same side, and the ports 2 and 3 are on the same side; the waveguide 1 is a sub-waveguide, the waveguide 2 is a main waveguide, and a single-mode initial excitation a is input to the port 1₁(0) The signal input to the port 4 is zero, and the propagation constants of the electromagnetic wave are β, β for the propagation constants in the waveguide 1 and the waveguide 2, respectively₀₁And β₀₂According to the coupled wave theory, for a single mode, the condition that the fixed phase shift coefficients of the waveguide 1 and the waveguide 2 are equal, that is, the synchronous condition that microwaves in the same mode are transmitted in the same direction in the two waveguides is as follows:

β₀₁＝β₀₂＝β；

for the fixed mode, let k be the coupling coefficient between waveguide 1 and waveguide 2₁₂And k₂₁The same direction of the coupled wave satisfies

|k₁₂|＝|k₂₁|；

The group velocity propagation constant β of the electromagnetic wave_eIs composed of

Voltage signal a in waveguide 1 and waveguide 2₁(z) and a₁(z) as a function of the coupling gap length z

a₁(z)＝a₁(0)cosβ₀₂ze^-jβz，

a₂(z)＝a₁(0)sinβ₀₂ze^-jβz；

The microwave is transmitted along the z direction, i.e. the length direction of the waveguide, the microwave power in the waveguide 1 and the waveguide 2 are respectively

If the length z of the coupling slot is l and the specific length satisfying the resonance condition is l, then:

the output end of the waveguide 2 has microwave output:

[a₂(l)]²＝[a₁(0)]²，

while the output end of the waveguide 1 has no power output:

[a₁(l)]＝0，

the energy is coupled into the main waveguide by the secondary waveguide; that is, if a single mode of microwave is input from port 1 of the sub waveguide, output from port 3 of the main waveguide is realized under the condition that the relevant conditions are satisfied. According to the reciprocal principle, if the microwave mode injected from the port 4 of the main waveguide is the same as that of the auxiliary waveguide, the microwave in the row is coupled into the auxiliary waveguide and output from the port 2;

s12: according to the polarized orthogonally coupled wave theory, circular waveguidesThe mode is divided into a horizontal polarization state and a vertical polarization state if the coupling structure satisfies

The coupling of the vertical polarization mode is horizontal polarization under the same condition

Coupling coefficient and vertical polarization of modes

Modes having different coupling coefficients and therefore being vertically polarised in a configuration satisfying the coupling conditions

The mode microwave is completely coupled into the main waveguide output by the secondary waveguide, and the horizontal polarization injected by the main waveguide

The mode microwave is output from the output port directly connected with the mode microwave, and the function that the microwave is input from two ports and output from one port is realized.

Further, in step S2, the specific steps include:

s21: modeling the synthesizer by adopting a finite difference time domain algorithm;

s22: and respectively arranging electromagnetic wave sources with different frequencies, powers, polarizations and incident wave vectors at each port of the synthesizer, and simulating according to a coupled wave theory to obtain the waveguide size and the material output result under different parameters.

Further, in step S3, the specific steps include:

s31: preprocessing according to the model, and calculating the positions of the photosensitive resin and the supporting material;

s32: jetting fine photosensitive resin liquid drops through a 3D printer and curing through ultraviolet rays to enable a material thin layer to be gathered on a building tray to form a 3D model and parts;

s33: and removing the supporting material after printing is finished.

Further, between steps S2 and S3, the following steps are further included: and according to the simulation result, manufacturing a four-way synthesizer by using a traditional machining method, testing the synthesis effect by matching with a backward wave tube, and continuously optimizing parameters by comparing the simulation result.

The four-path high-power microwave synthesizer based on 3D printing comprises an input section, a coupling section and an output section which are sequentially connected, wherein the input section is not less than four paths;

the input section comprises a main channel and an auxiliary channel, the main channel is a straight section circular waveguide, and the auxiliary channel is a circular waveguide with a rotating shaft bent by 90 degrees; the input section is used for injecting microwaves;

the coupling section comprises two back-to-back circular waveguides with the same overall dimension, one circular waveguide is a main waveguide, the other circular waveguide is an auxiliary waveguide, and a continuous long slit is arranged between the main waveguide and the auxiliary waveguide; the coupling section is used for coupling microwave energy into the main waveguide from the secondary waveguide;

the output section comprises at least four back-to-back circular waveguides, wherein one of the four back-to-back circular waveguides is a long waveguide, at least three of the four back-to-back circular waveguides are short waveguides, the short waveguides are connected with the auxiliary channel through the auxiliary waveguide, and the long waveguides are connected with the main channel through the main waveguide and are the common output end of the synthesizer; the output section is used for outputting microwaves.

Furthermore, sealing grooves are formed in the connection surfaces of all the components of the synthesizer, and are used for meeting the use condition in a high-vacuum environment.

The invention has the beneficial effects that:

1. the four-path high-power microwave synthesizer manufacturing method and the synthesizer based on 3D printing utilize different polarized input waves to construct a four-path synthesizer and utilize a channel synthesis method, the four-path high-power synthesizer with high synthesis efficiency is manufactured, and the functions of synthesizing microwaves output by microwave sources of different frequency bands and radiating outwards by a common antenna are realized; namely, the synthesis efficiency and the output total power of the microwave are improved while the microwave frequency band output by the system is expanded.

2. The invention carries out power synthesis on a plurality of radiation sources in the high-power microwave device, thereby realizing the function of simultaneously damaging and interfering equipment with different sensitive frequency points; and the power capacity is improved by increasing the energy of the single frequency point, and the multi-source power synthesis function of high-power microwave wireless energy transmission is realized.

3. The four-path high-power synthesizer is manufactured in a one-step forming mode through the 3D printing technology, and the ignition problem of the synthesizer manufactured by the traditional method is effectively solved.

4. The finite difference time domain algorithm adopted by the invention is simple in modeling and high in calculation speed.

Drawings

FIG. 1 is a flow chart of an embodiment of the present invention.

Fig. 2 is a three-dimensional structural view of an embodiment of the present invention.

Fig. 3 is a schematic diagram of a two-way synthesizer of an embodiment of the present invention.

Fig. 4 is a modeling diagram of a two-way synthesizer of an embodiment of the present invention.

Fig. 5 is a diagram of a simulation result of the main waveguide input according to the embodiment of the present invention.

Fig. 6 is a diagram of a secondary waveguide input simulation result according to an embodiment of the present invention.

Fig. 7 is a diagram of X-band simulation results according to an embodiment of the present invention.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

Referring to fig. 1, an embodiment of the present invention includes the steps of:

s1: analyzing the coupling mechanism of the four-way synthesizer according to an electromagnetic wave coupling mode equation, and giving an optimal mode and an optimal matching mode; the magnetic coupling mode is adopted to analyze the influence of different input polarization modes on the coupling efficiency, the relationship between the strength of the coupling degree and the waveguide radius, the microwave frequency, the microwave mode and the slit width is deduced, and four optimal polarization input modes are sought:

s11: referring to fig. 3, the two continuous long-slot coupling structures include two back-to-back circular waveguides, which are respectively a waveguide 1 and a waveguide 2, the two waveguides have the same physical size, a continuous coupling slot with a length of z is formed between the two waveguides, ports on two sides of the waveguide 1 are respectively a port 1 and a port 2, ports on two sides of the waveguide 2 are respectively a port 3 and a port 4, the port 1 and the port 4 are on the same side, and the port 2 and the port 3 are on the same side; according to the electromagnetic coupling wave theory, if two lines of waves transmitted in the two waveguides meet the relevant synchronous conditions, the two lines of waves are converted back and forth in the two waveguides.

The waveguide 1 is a sub-waveguide, the waveguide 2 is a main waveguide, and a single-mode initial excitation a is input to the port 1₁(0) The signal input to the port 4 is zero, and the propagation constants of the electromagnetic wave are β, β for the propagation constants in the waveguide 1 and the waveguide 2, respectively₀₁And β₀₂According to the coupled wave theory, for a single mode, the condition that the fixed phase shift coefficients of the waveguide 1 and the waveguide 2 are equal, that is, the synchronous condition that microwaves in the same mode are transmitted in the same direction in the two waveguides is as follows:

β₀₁＝β₀₂＝β；

for the fixed mode, let k be the coupling coefficient between waveguide 1 and waveguide 2₁₂And k₂₁The same direction of the coupled wave satisfies

|k₁₂|＝|k₂₁|；

The group velocity propagation constant β of the electromagnetic wave_eIs composed of

Voltage signal a in waveguide 1 and waveguide 2₁(z) and a₁(z) as a function of the coupling gap length z

a₁(z)＝a₁(0)cosβ₀₂ze^-jβz，

a₂(z)＝a₁(0)sinβ₀₂ze^-jβz；

The microwave is transmitted along the z direction, i.e. the length direction of the waveguide, the microwave power in the waveguide 1 and the waveguide 2 are respectively

If the length z of the coupling slot is l and the specific length satisfying the resonance condition is l, then:

the output end of the waveguide 2 has microwave output:

[a₂(l)]²＝[a₁(0)]²，

while the output end of the waveguide 1 has no power output:

[a₁(l)]＝0，

the energy is coupled into the main waveguide by the secondary waveguide; that is, if a single mode of microwave is input from port 1 of the sub waveguide, output from port 3 of the main waveguide is realized under the condition that the relevant conditions are satisfied. According to the reciprocal principle, if the microwave mode injected at port 4 of the main waveguide is the same as that of the secondary waveguide, the microwaves of the column are all coupled into the secondary waveguide and output from port 2.

S12: according to the polarized orthogonally coupled wave theory, circular waveguides

The mode is divided into a horizontal polarization state and a vertical polarization state if the coupling structure satisfies

The coupling of the vertical polarization mode is horizontal polarization under the same condition

Coupling coefficient and vertical polarization of modes

Modes having different coupling coefficients and therefore being vertically polarised in a configuration satisfying the coupling conditions

The mode microwave is completely coupled into the main waveguide output by the secondary waveguide, and the horizontal polarization injected by the main waveguide

Only a few parts of mode microwaves are coupled into the auxiliary waveguide, and most of energy is output from an output port directly connected with the auxiliary waveguide, so that the function that the microwaves are input from two ports and output from one port is realized.

S2: referring to fig. 4, a finite difference time domain algorithm (FDTD algorithm) is adopted in electromagnetic simulation software to model the synthesizer, simulate field distribution of a coupling structure, and simulate and analyze the influence of the slit width, the slit length, the waveguide size and the material on the coupling efficiency, and the influence of the power capacity and the isolation of the main channel relative to the auxiliary channel on the coupling process according to the coupled wave theory, so as to provide the waveguide size and the material which are convenient for engineering realization, and realize the size matching with the output waveguide of the return wave tube:

s21: modeling the synthesizer by adopting a finite difference time domain algorithm;

s22: respectively arranging electromagnetic wave sources with different frequencies, powers, polarizations and incident wave vectors at a port 1 and a port 4 of the synthesizer, and according to a coupled wave theory: when the microwave frequency and the mode are fixed, the larger the waveguide radius is, the weaker the coupling degree is under the condition of the same coupling slit width, and the longer the coupling slit is needed by all energy coupling; when the radius of the waveguide is fixed, the narrower the coupling gap is, the longer the coupling gap is needed by the energy total coupling; and (5) simulating to obtain the output results of the slit width, the slit length, the waveguide size and the material under different parameters.

If the working frequency is set to be 9.3GHz, the radius of the circular waveguide is selected to be 25mm, and the simulation result is shown in fig. 5 and 6, the simulation result shows that the main waveguide transmits horizontal polarization

In the mode, electromagnetic waves are output from the port 3, and the energy transmission efficiency is kept above 99%; when the secondary waveguide inputs vertical polarization

In the mode, the energy coupling efficiency reaches more than 96 percent within the 200MHz bandwidth range; the results show that the FDTD algorithm can well simulate the effect of a synthesizer, and theoretical design support is provided for subsequent processing。

Between steps S2 and S3, the following steps are further included: and according to the simulation result, manufacturing a four-way synthesizer by using a traditional machining method, testing the synthesis effect by matching with a backward wave tube, and continuously optimizing parameters by comparing the simulation result. The simulation result is shown in fig. 7, the reflection coefficient of the four-way synthesizer is better than-25 dB, the synthesis efficiency is better than 91%, and the power limit reaches 30 MW; where the power limit is primarily limited by the smoothness of the inner surface of the waveguide.

S3: printing one-step forming through 3D, and manufacturing a physical model of the synthesizer:

s31: preprocessing is carried out according to the three-dimensional model, and the positions of the photosensitive resin and the supporting material are calculated through pre-established software in a computer;

s32: jetting fine photosensitive resin liquid drops through a 3D printer and curing through ultraviolet rays to enable a material thin layer to be gathered on a building tray to form a 3D model and parts;

s33: after printing is finished, the supporting material is manually or manually removed by water, subsequent curing is not needed, and the model and the parts generated by the 3D printer can be directly processed and used.

The 3D printing refers to a process of utilizing PolyJet technologies such as photocuring or paper lamination to superpose liquid or powder materials layer by layer through computer control, so that a computer model is changed into a real object. According to different actual requirements and application fields, 3D printing technologies are different, and common 3D printing technologies include a fused deposition technology, an electron beam melting and forming technology, a stereolithography technology, an additive manufacturing technology, and the like. The embodiment of the invention adopts a desktop grade 3D printer OBJET 30 produced by the company STRATASYS in America to manufacture a synthesizer, the printing precision is 600 multiplied by 900dpi, namely 42.3 multiplied by 28 mu m, wherein the layer direction precision along the Z axis direction is 28 mu m, the precision along the X axis direction and the Y axis direction is 2.3 mu m, the maximum printable size is 294 multiplied by 192 multiplied by 148.6mm, and the machine can process a complex space structure.

Referring to fig. 2, the four-path high power microwave synthesizer manufactured by the four-path high power microwave synthesizer manufacturing method based on 3D printing includes an input section, a coupling section and an output section which are connected in sequence, wherein the input section is not less than four; the input section comprises a main channel and an auxiliary channel, the main channel is a straight section circular waveguide, and the auxiliary channel is a circular waveguide with a rotating shaft bent by 90 degrees; the input section is used for injecting microwaves; the coupling section comprises two back-to-back circular waveguides with the same overall dimension, one circular waveguide is a main waveguide, the other circular waveguide is an auxiliary waveguide, and a continuous long slit is arranged between the main waveguide and the auxiliary waveguide; the coupling section is used for coupling microwave energy into the main waveguide from the secondary waveguide; the output section comprises at least four back-to-back circular waveguides, wherein one of the four back-to-back circular waveguides is a long waveguide, at least three of the four back-to-back circular waveguides are short waveguides, the short waveguides are connected with the auxiliary channel through the auxiliary waveguide, and the long waveguides are connected with the main channel through the main waveguide and are the common output end of the synthesizer; the output section is used for outputting microwaves. The connection surface of each part of the synthesizer is carved with the seal groove for satisfy the condition that uses under high vacuum environment.

The above embodiments are only used for illustrating the design idea and features of the present invention, and the purpose of the present invention is to enable those skilled in the art to understand the content of the present invention and implement the present invention accordingly, and the protection scope of the present invention is not limited to the above embodiments. Therefore, all equivalent changes and modifications made in accordance with the principles and concepts disclosed herein are intended to be included within the scope of the present invention.