Eight-path power synthesis device with automatic switching function and method thereof

Abstract

The invention relates to the technical field of microwave power sources, in particular to an eight-path power synthesis device capable of automatically switching input ports and a power synthesis method thereof, which are mainly applied to an accelerator power source system. Comprising eight input ports; one path of output port; the system comprises eight power synthesis units, eight short circuiting devices, eight coaxial change-over switches and eight power detection units. Each path of power synthesis unit is respectively connected to one port of the coaxial change-over switch, and when the power detection unit detects that the power of the corresponding input port is lower than a preset threshold value, the coaxial change-over switch is controlled to be switched to the short circuit device, and the input end of the synthesis unit is short-circuited; through the innovation points of automatic and intelligent switching, high synthesis efficiency and power balance, flexible port configuration and expansibility, reliability and stability, simplified maintenance and operation and the like, a brand new and efficient solution is provided for the field of power synthesizers.

Description

Technical Field

[0001] The present invention relates to the technical field of microwave power sources, and particularly to an 8-way power combining device capable of automatically switching input ports and a power combining method thereof, which are mainly applied to the accelerator power source system. Background Art

[0002] In the field of microwave power sources, solid-state radio frequency power sources have become an important choice for particle accelerator radio frequency power sources due to their mature technology, decreasing research and development costs year by year, low operating voltage, long service life, and modular design that is easy to maintain. To improve the operating stability of the accelerator, redundant design of power amplifier modules is usually adopted to ensure that when a limited number of power amplifier modules fail, the remaining power amplifier modules can still operate normally and keep the entire solid-state power source system running without downtime.

[0003] However, when one or more power amplifier modules in the solid-state power source fail, an imbalance will occur between the input terminals of the power combiner. This imbalance will cause the output power of the normally operating power amplifier modules not to be fully output from the output port of the combiner, and part of the power will be reflected back to other input ports, thereby reducing the overall power combining efficiency of the solid-state power source and increasing the reflected power of other input ports. Under the condition of total reflection, at certain phase points, the input ports may even bear several times the reflected power, seriously affecting the reliability of the whole machine.

[0004] To solve these problems that occur when the power amplifier module fails, existing technical solutions often cannot automatically adapt to the state changes of the power amplifier module and require manual intervention for adjustment, which not only increases the complexity of maintenance but also may introduce new instability factors during the adjustment process. Therefore, there is an urgent need for a device and method that can automatically detect the state of the power amplifier module and automatically adjust the input port configuration of the power combiner according to the state changes.

[0005] In addition, with the changing requirements of engineering applications, the solid-state power source may need to operate at different power levels. Traditional power combiners usually can only meet the requirements of a specific power level. When the power requirement changes, it may be necessary to replace different power combiners, which increases the cost and complexity of engineering construction. Summary of the Invention

[0006] Therefore, the present invention proposes an 8-way power combining device with an automatic switching function and its method, aiming to solve the problems of low combining efficiency and large reflected power borne by the power amplifier module when the power amplifier module fails in a solid-state power source, and at the same time provide a solution that can flexibly adapt to different power level requirements; by automatically detecting the status of the power amplifier module and automatically adjusting the input port configuration of the power combiner, the present invention can significantly improve the stability and reliability of the solid-state power source, reduce the maintenance cost, and provide an efficient and flexible option for the application scenario of step-by-step power increase of the solid-state power source.

[0007] The main technical solution adopted by the present invention is: an 8-way power combining device with an automatic switching function, comprising:

[0008] 8 input ports;

[0009] 1 output port;

[0010] 8 power combining units, each power combining unit is respectively connected to a port of a coaxial switch;

[0011] 8 power detection units, respectively used to detect the incident power of the corresponding input port;

[0012] 8 coaxial switches, each coaxial switch has three ports, which are respectively connected to the corresponding power amplifier module, short-circuit breaker and the input end of the combining unit;

[0013] 8 short-circuit breakers;

[0014] Wherein, when the power detection unit detects that the power of the corresponding input port is lower than the preset threshold, the coaxial switch is controlled to switch to the short-circuit breaker to short-circuit the input end of the combining unit.

[0015] The electrical length from the input end of the combining unit to the short-circuit plane is required to be N * 1 / 2 wavelength, where N is an integer.

[0016] The internal network structure of the combining unit includes a first-stage combining network, a second-stage combining network and a third-stage combining network. Each stage of the combining network adopts 2-stage impedance transformation, and the impedance and electrical length of a specific arm in the combining unit meet the preset conditions to achieve power combining.

[0017] The impedances of the two arms ① and ② in the combining unit are 50Ω respectively, and the electrical length is 1 / 4 wavelength of the input radio frequency signal. The impedance of the ③ arm is 35.35Ω, and the electrical length is 1 / 4 wavelength of the input radio frequency signal. The impedance of the ④ arm is 50Ω, and the electrical length has no specific requirement.

[0018] A method for power combining by an 8-way power combining device with an automatic switching function, comprising the following steps:

[0019] S1. Detect the incident power of each input port;

[0020] S2. When the power of a certain input port is detected to be lower than the preset threshold, control the corresponding coaxial switch to switch to the short-circuit breaker to short-circuit the input terminal;

[0021] S3. Synthesize the signals of the remaining input ports through the synthesis unit and output the RF signal from the output port.

[0022] A method for power synthesis of an 8-way power synthesis device with an automatic switching function further includes the step of automatically adjusting the working mode of the synthesis device to a seven-in-one, six-in-one, five-in-one, four-in-one, three-in-one or two-in-one power synthesizer mode according to the number of faulty input ports.

[0023] When the power amplifier module of any port fails and there is no power output, the power amplifier module of this port can be pulled out from the input end of the synthesizer, and the input port is connected to the short-circuit breaker through a coaxial transmission line. The electrical length of the coaxial transmission line is N * 1 / 2 wavelength, where N is an integer.

[0024] The coaxial transmission line can be replaced by a phase shifter to adjust the phase from the short-circuit plane to the input end of the synthesis network and optimize the synthesis efficiency.

[0025] The synthesis network inside the synthesis unit can be designed as a microstrip line, a stripline or other forms of synthesis structures as long as the electrical length and impedance meet the preset conditions.

[0026] An 8-way power synthesis device or method with an automatic switching function, which can be applied to microwave frequencies of various frequency bands, such as FM, VHF, UHF, etc., and power synthesis of various power levels.

[0027] The beneficial effects of this technical solution are as follows: The technical solution of this application provides an 8-way power synthesis device with automatic switching. Through innovations such as automatic and intelligent switching, high synthesis efficiency and power balance, flexible port configuration and scalability, reliability and stability, and simplified maintenance and operation, it brings a new and efficient solution to the field of power synthesizers. This synthesizer not only meets the requirements of various complex application scenarios currently, but also provides broad space and possibilities for the future system development and upgrade. Specifically, it is mainly reflected in the following:

[0028] First, through the integrated power detection unit and coaxial switch, this power combining device realizes real-time monitoring and intelligent switching of the power at the input ports. When it detects that there is no power or the power is low at a certain input terminal, it can automatically switch that port to the short-circuit state without manual intervention, greatly improving the automation level and operation efficiency of the system. Through the innovative design of the combining unit and precise control of electrical length and impedance, when this power combining device switches to different operating modes such as seven-in-one and six-in-one, it can maintain a very high combining efficiency (for example, the seven-in-one combining efficiency is as high as 99.5%, and the six-in-one combining efficiency reaches 97.9%, etc.). At the same time, the automatic switching mechanism ensures the power balance of the remaining input ports of the combining device, effectively reducing the reflected power and improving the overall power combining efficiency.

[0029] Second, this power combining device supports short-circuit switching of any number of input ports (up to 8 channels), realizing flexible switching among various operating modes from eight-in-one to seven-in-one, six-in-one, etc. This flexibility not only meets the requirements of different application scenarios but also provides convenience for future system expansion and upgrade. Through precise electrical length design and impedance matching, this synthesizer can maintain stable operating performance during the switching process, reducing signal interference and power loss caused by switching. At the same time, the automatic switching mechanism avoids system paralysis caused by the failure of the power amplifier module, improving the reliability and stability of the system.

[0030] Finally, when the power amplifier module fails, this power combining device short-circuits the input terminal of the combining unit by connecting the coaxial transmission line and the short-circuit breaker to achieve automatic mode switching, and allows the faulty module to be quickly and simply pulled out of the system and a new power amplifier module to be inserted, realizing the online hot plugging of the power amplifier module. This simplified maintenance process greatly reduces the maintenance time and cost, improving the maintainability and usability of the system. Description of the Drawings

[0031] Figure 1 It is a schematic diagram of the logical structure of the 8-channel power combining device with an automatic switching function in the present invention.

[0032] Figure 2 It is a schematic diagram of the synthesis network structure of the 8-channel power combining unit in the present invention.

[0033] Figure 3 It is the S-parameter diagram of the synthesizer after the 2-port is switched to the short-circuit plane in the present invention.

[0034] Figure 4 It is a schematic diagram of the logical principle of another implementation method in the present invention. Detailed Embodiment

[0035] The present invention relates to an 8-way power combining device with an automatic switching function and its method, which is mainly applied to the field of accelerator power sources, aiming to solve the problems of low power combining efficiency of the power combiner and large reflected power borne by the power amplifier modules when one or more power amplifier modules in the solid-state power source fail. The specific embodiments of the present invention will be described in detail below.

[0036] I. Device Structure

[0037] The 8-way power combining device proposed by the present invention mainly includes: 8 input ports, 1 output port, 8 power combining units, 8 short-circuit switches, 8 coaxial switches, a power detection unit, etc. The overall structure is as Figure 1 shown.

[0038] (1) Input Ports and Output Port: The 8 input ports are used to connect 8 power amplifier modules of the solid-state power source, and the 1 output port is used to output the combined RF signal.

[0039] Combining Unit: The combining unit is responsible for combining the signals of each input port and outputting them from the output port. The internal network structure of the combining unit is mainly composed of a first-stage combining network, a second-stage combining network, and a third-stage combining network, as Figure 2 shown. Each stage of the combining network uses 2-stage impedance transformation, and the specific impedance and electrical length requirements are as follows:

[0040] The impedance of arms ① and ② in the combining unit is 50Ω, and the electrical length is 1 / 4 wavelength of the input RF signal.

[0041] The impedance of arm ③ in the combining unit is 35.35Ω, and the electrical length is 1 / 4 wavelength of the input RF signal.

[0042] The impedance of arm ④ in the combining unit is 50Ω, and there is no specific requirement for the electrical length.

[0043] (2) Power Detection Unit: The power detection unit is used to detect the incident power of the input port of the combining device and decide whether to perform coaxial switch switching according to the detected RF power.

[0044] (3) Coaxial Switch: One port of the coaxial switch is connected to the power amplifier module, one port is connected to the short circuit surface, and the other port is connected to the input end of the combining unit. When the power detection unit issues a switching signal, the coaxial switch automatically switches from the port connected to the power amplifier to the port connected to the short-circuit switch.

[0045] (4) Short-Circuit Switch: The short-circuit switch is used to short-circuit the input end of the combining device when the power amplifier module fails to ensure the power balance of the remaining input ports.

[0046] II. Working Method (1) Normal Working State:

[0047] When all 8 power amplifier modules are working properly, the RF signals output by the power amplifier modules are connected to the 8 input ports. The combining unit combines the signals of each input port and outputs the combined RF signal from the output end.

[0048] (2) Fault switching state:

[0049] When the power detection unit detects that there is no power or very little power at a certain input port, it sends a switching signal to the corresponding coaxial switch. After receiving the switching signal, the coaxial switch automatically switches from connecting to the power amplifier port to connecting to the short-circuit breaker, short-circuiting the input end. The power of the remaining input ports of the combining device remains balanced, and the mode switching of the number of input ports of the combining device is automatically completed. At this time, the output power of the normally working power amplifier modules is mainly output from the output port of the combining device, reducing the reflected power of each input port and improving the power combining efficiency.

[0050] (3) Mode switching and efficiency improvement:

[0051] The combining device proposed by the present invention can be flexibly switched into combiners with different working modes such as seven-in-one, six-in-one, five-in-one, and four-in-one. When the combining device is switched to a seven-in-one or six-in-one combiner, the combining efficiency is higher than 97%.

[0052] (4) Another implementation method:

[0053] When a power amplifier module at any port fails, the power amplifier module at this port can also be pulled out from the input end of the combiner, and then the input port is connected to a coaxial transmission line (or a phase shifter), and the other end of the coaxial transmission line is connected to a short-circuit breaker. The electrical length from the input end of the combining unit to the short-circuit plane is required to be N * 1 / 2 wavelength (N is an integer) to ensure the best combining efficiency of the combiner.

[0054] Embodiment 1

[0055] As Figures 1 - 4 shown, an 8-way power combining device with an automatic switching function mainly includes: 8 input ports, 1 output end, 8-way power combining unit, 8 short-circuit breakers, 8 coaxial switches, a power detection unit, etc. The overall structure is as Figure 1 shown.

[0056] The power detection unit detects the incident power at the input port of the combining device, decides whether to switch the coaxial switch based on the detected RF power, and sends this signal to the coaxial switch to control its switching. One port of the coaxial switch is connected to the power amplifier module, one port is connected to the short circuit plane, and the other port is connected to the input end of the combining unit. The combining unit combines the signals of each input port and outputs the RF signal from the output end. More specifically, each power combining unit is respectively connected to one port of the coaxial switch. When the power detection unit detects that there is no power or very little power at the input end, it sends a switching signal to the coaxial switch, and the coaxial switch automatically switches from the port connected to the power amplifier to the port connected to the short circuit breaker.

[0057] The electrical length from the input end of the combining unit to the short circuit plane is required to be N * 1 / 2 wavelength, where N is an integer.

[0058] The impedances of the 8 input ends and 1 output end of the combining unit are all 50Ω. The internal network structure of the combining unit mainly consists of the first-stage combining network, the second-stage combining network, and the third-stage combining network. As Figure 2 shown. Each stage of the combining network uses 2-stage impedance transformation. The impedances of the two arms ① and ② in the combining unit are 50Ω respectively, and the electrical length is 1 / 4 wavelength of the input RF signal. The impedance of the arm ③ in the combining unit is 35.35Ω, and the electrical length is 1 / 4 wavelength of the input RF signal. The impedance of the arm ④ in the combining unit is 50Ω, and there is no specific requirement for the electrical length.

[0059] As Figure 2 shown, the two arms ① and ② in the first-stage combining network are the input ends of the combining unit. The combining output end ③ of the first-stage combining network is successively connected to the two arms ① and ② of the second-stage combining network. The combining output end ③ of the second-stage combining network is respectively connected to the two arms ① and ② of the third-stage combining network. The arm ③ of the third-stage combining network is connected to the arm ④, and the arm ④ is connected to the output end of the combiner.

[0060] When the RF signals at the 8 input ports are of equal amplitude and in phase, it is used as an eight-in-one combining device. The isolation between each input port is about 18dB, and the insertion loss from each input port to the output port is about 9dB.

[0061] In Figure 1In the overall structure of the combining device, the 8 input ports are all the same. Without loss of generality, port 1 is the output port of the combining device. When the power amplifier module connected to input port 2 fails and the power amplifier output power is 0, through simulation calculation, it can be obtained that the combining efficiency is about 87.5%, which means that 12.5% of the power is reflected back to the power amplifier module. Among them, 10.9% of the power is reflected back to the faulty power amplifier, and the remaining 1.6% of the reflected power enters the other 7 power amplifier modules respectively. Connecting input port 2 of the combining device to a short-circuit breaker, through simulation calculation, it can be obtained that the combining efficiency is about 99.5%, and only 0.5% of the power is reflected back to the power amplifier module. The forward and reverse radio frequency current signals at the short-circuit port are equal in magnitude and opposite in direction, just canceling each other out. The combining device has switched from an 8-way power combining mode to a seven-in-one power combiner mode, and the combining efficiency has increased by 12 percentage points compared to before connecting the short-circuit breaker. At this time, the S parameters of the combiner are as follows. From Figure 3 it can be seen that at this time the combining device has been transformed into a standard seven-in-one power combiner. It greatly improves the combining efficiency of the combiner when one or more power amplifier modules of the solid-state power source fail, and at the same time reduces the reflected power borne by the power amplifier module.

[0062] When the power detection unit detects that there is no power or very little power at the input end of the combining device, the coaxial switch automatically switches from the port connected to the power amplifier to the port connected to the short-circuit breaker, and the combiner automatically switches to working modes such as seven-in-one power combiner, six-in-one power combiner, five-in-one power combiner, four-in-one power combiner, three-in-one, and two-in-one. Table 1 lists the efficiencies of the combining device in 5 different working modes respectively. It can be seen from the table that the 8-way power combining device with automatic switching function and its power combining method designed by the present invention greatly improve the combining efficiency of the combining device when one or more power amplifier modules of the solid-state power source fail, and at the same time reduce the reflected power borne by the power amplifier module; the specific switching method and efficiency improvement are shown in Table 1.

[0063] Table 1: Combining efficiencies in different working modes

[0064]

[0065] As can be seen from Table 1, when the synthesis device of the present invention is adopted and the eight-in-one synthesis device is switched to a seven-in-one or six-in-one synthesizer, the synthesis efficiency is higher than 97%. Therefore, the synthesis method proposed by the present invention also provides an option for the application scenario of power segmentation improvement of the solid-state power source. For example, when the required power is small in the early stage, only some ports at the input end of the eight-in-one synthesis device need to insert the power amplifier module. The method of the present invention can be used to short-circuit the ports without power input, so as to flexibly switch to synthesizers with different working modes such as seven-in-one synthesizers and six-in-one synthesizers. More power can be guaranteed to reach the output port, and only a small amount of power is reflected back to the power amplifier module. Since there is no need to develop a variety of synthesizers to meet the requirements of different engineering stages, the engineering construction cost is reduced.

[0066] Embodiment 2

[0067] As described in the hardware of Embodiment 1, taking the failure of the power amplifier module of input port 2 as an example, the specific implementation manner of the present invention is described as follows:

[0068] Fault detection: The power detection unit detects that there is no power input at input port 2.

[0069] Switching operation: After receiving the switching signal, coaxial switch 2 automatically switches from connecting to the power amplifier port to connecting to the short-circuit device. Input port 2 is short-circuited, and the power of the remaining input ports of the synthesis device remains balanced.

[0070] Efficiency improvement: The synthesis device switches from the 8-way power synthesis mode to the seven-in-one power synthesis mode. The synthesis efficiency is increased from 87.5% to 99.5%, greatly reducing the reflected power borne by the power amplifier module.

[0071] Embodiment 3

[0072] Another example of the implementation method. As Figure 4 shown, when the power amplifier module of input port 2 fails, the power amplifier module of this port can also be pulled out, and then a coaxial transmission line (or phase shifter) and a short-circuit device are connected. Adjust the length of the coaxial transmission line (or phase shifter) so that the electrical length from the input end of the synthesis unit to the short-circuit surface is N * 1 / 2 wavelength (N is an integer) to ensure the best synthesis efficiency of the synthesizer.

[0073] Embodiment 4

[0074] This embodiment provides another technical solution for the flexible configuration and fault handling of the power synthesizer, which specifically includes the following steps and design points:

[0075] (1) Fault handling of the power amplifier module and switching of the synthesizer mode:

[0076] In this embodiment, when the power amplifier module of any port fails and there is no power output, first pull out the power amplifier module of the faulty port from the input end of the synthesizer.

[0077] Next, connect a coaxial transmission line to the input port. The other end of the coaxial transmission line is connected to a short-circuit device. Here, the electrical length from the input end of the combining unit to the short-circuit plane is required to be N * 1 / 2 wavelength (N is an integer). Such a design can ensure that after removing the faulty module, the synthesizer can be flexibly switched to synthesizers with different working modes such as a seven-in-one synthesizer and a six-in-one synthesizer to meet the actual requirements.

[0078] To optimize the combining efficiency, the coaxial transmission line can be replaced with a phase shifter. By adjusting the phase shifter, the phase from the short-circuit plane to the input end of the combining network can be adjusted, so that the combining efficiency of the synthesizer reaches the best.

[0079] In addition, the part with the short-circuit plane plus the phase shifter can also be replaced with a sliding short-circuit device, which can not only achieve the short-circuit function but also conveniently adjust the phase.

[0080] (II) Direct short-circuit processing scheme:

[0081] In this embodiment, when a power amplifier module fails at any port, another processing method is to directly short the inner conductor of the synthesizer input end to the ground.

[0082] Alternatively, connect a coaxial transmission line with adjustable length, and the other end of the coaxial transmission line is shorted to the ground. At this time, the electrical length of the coaxial line should also be set to N * 1 / 2 wavelength (N is an integer) to ensure the stability and performance of the system.

[0083] (III) Combining network design:

[0084] The combining network inside the synthesizer in this embodiment can be designed in various forms, such as a microstrip line synthesizer, a stripline synthesizer, etc., to meet the requirements of different application scenarios.

[0085] (IV) Expandability:

[0086] This embodiment has good expandability and can be expanded to a 16-way power combiner to improve the power combining ability and flexibility of the system.

[0087] (V) Applicable frequency band:

[0088] The power combiner design in this embodiment is applicable to microwave frequencies in various frequency bands, such as FM, VHF, UHF, etc., to meet the power combining requirements in different frequency bands.

[0089] (VI) Applicability of power level:

[0090] The power combiner of this embodiment is also applicable to power combination of various power levels. Whether it is a low-power or high-power application, it can provide a stable and efficient power combination solution. This embodiment provides a flexible and efficient implementation scheme of the power combiner. By simply unplugging and connecting the modules and adjusting the connections, the switching of the working mode of the combiner and the fault handling can be achieved. At the same time, it has good scalability and applicability, meeting the power combination requirements of multiple frequency bands and power levels.

[0091] The present invention proposes an 8-way power combining device with an automatic switching function and its method through the above embodiments. By the combined use of the power detection unit and the coaxial switch, the function of automatically switching the input port in case of a failure of the power amplifier module is achieved, greatly improving the power combination efficiency and reducing the reflected power borne by the power amplifier module. At the same time, the present invention also has the advantages of strong flexibility and wide application range, providing strong technical support for the development and application of solid-state power sources.

Claims

1. An 8-way power synthesis device with automatic switching function, characterized in that: include: 8-way input port; 1 output port; 8-way power synthesis unit, each of which is connected to one port of the coaxial conversion switch; 8 power detection units, used to detect the incident power of the corresponding input port; 8 coaxial conversion switches, each coaxial conversion switch has three ports, which are respectively connected to the input ends of the corresponding power amplifier module, the short circuiter and the synthesis unit; 8 short circuits; When the power detection unit detects that the power of the corresponding input port is lower than a preset threshold, the coaxial conversion switch is controlled to switch to a short-circuiter to short-circuit the input end of the synthesis unit.

2. The 8-way power synthesis device with automatic switching function according to claim 1, characterized in that: The electrical length from the input end of the synthesis unit to the short-circuit path is required to be N*1 / 2 wavelength, where N is an integer.

3. The 8-way power synthesis device with automatic switching function according to claim 1 or 2, characterized in that: The internal network structure of the synthesis unit includes a first-level synthesis network, a second-level synthesis network and a third-level synthesis network. Each synthesis network adopts a two-level impedance transformation, and the impedance and electrical length of a specific arm in the synthesis unit meet preset conditions to achieve power synthesis.

4. The 8-way power synthesis device with automatic switching function according to claim 3, characterized in that: In the synthesis unit, the impedances of arms ① and ② are 50Ω respectively, and the electrical length is 1 / 4 wavelength of the input RF signal. The impedance of arm ③ is 35.35Ω, and the electrical length is 1 / 4 wavelength of the input RF signal. The impedance of arm ④ is 50Ω, and there is no specific requirement for the electrical length.

5. A method for power synthesis using an 8-way power synthesis device with automatic switching function, characterized in that: The following steps are involved: S1, detect the incident power of each input port; S2, when it is detected that the power of a certain input port is lower than a preset threshold, the corresponding coaxial conversion switch is controlled to switch to a short circuit device to short-circuit the input port; S3. The signals of the remaining input ports are synthesized by a synthesis unit, and a radio frequency signal is output from the output port.

6. The method for performing power synthesis using an 8-way power synthesis device with automatic switching function according to claim 5, characterized in that: The method also includes the steps of automatically adjusting the working mode of the synthesis device to a seven-in-one, six-in-one, five-in-one, four-in-one, three-in-one or two-in-one power synthesizer mode according to the number of fault input ports.

7. The 8-way power synthesis device with automatic switching function according to claim 1, characterized in that: When the power amplifier module of any port fails and has no power output, the power amplifier module of this port can be unplugged from the input end of the synthesizer, and the input port can be connected to the short-circuiter through a coaxial transmission line. The electrical length of the coaxial transmission line is N*1 / 2 wavelength, where N is an integer.

8. The 8-way power synthesis device with automatic switching function according to claim 7, characterized in that: The coaxial transmission line can be replaced with a phase shifter to adjust the phase from the short-circuit to the input of the combining network to optimize the combining efficiency.

9. The 8-way power synthesis device with automatic switching function according to claim 1, characterized in that: The synthesis network inside the synthesis unit can be designed as a microstrip line, a stripline or other forms of synthesis structure, as long as the electrical length and impedance meet the preset conditions.

10. The 8-way power synthesis device or method with automatic switching function according to any one of claims 1 to 9, characterized in that: The device or method can be applied to microwave frequencies of various frequency bands, such as FM, VHF, UHF, etc., and power synthesis of various power levels.

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