A structure for realizing multi-path magnetron module frequency locking based on single-path injection

Abstract

The application discloses a structure for realizing multi-way magnetron module frequency locking based on single-way injection and belongs to the technical field of vacuum electron devices. The structure comprises a microwave power source, a matching load, N magnetron modules and N circulators. The application utilizes the circulators to realize the connection of adjacent magnetron modules, injects the power reflected by the injection port of the front-stage magnetron module into the rear-stage magnetron module through the circulator as a frequency locking signal based on the one-way signal flow of the circulator, ensures that the microwave power source will not be damaged by the reflected signal, realizes the secondary utilization of the injection port reflected signal, greatly improves the injection frequency locking capacity of the system, and realizes the purpose of controlling the frequency locking of multi-way magnetron modules by single-way injection.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of vacuum electron devices, and particularly relates to a structure for realizing frequency locking of a multi-path magnetron module based on single-path injection. BACKGROUND

[0002] A magnetron is a reentrant resonant type cross-field device, the resonant cavity of which is connected at both ends, easy to form positive feedback to generate oscillation, and is a high-power source in microwave technology. As the largest vacuum electron device in the world, the main features of the magnetron are high efficiency and low operating voltage, and the features of small size, light weight, easy to use, stable and reliable operation, and low cost due to simple structure. The magnetron is not only used in various military equipment such as radar and navigation, but also widely used in industrial, agricultural, medical and health fields. In the above application scenarios, whether it is to realize high-power output of a single magnetron or to meet the demand for coherent power synthesis of a magnetron array, the magnetron is required to have stable oscillation frequency and phase. Therefore, the injection frequency locking technology of the magnetron is an important technology for realizing multi-path microwave power synthesis.

[0003] The main principle of the injection frequency locking technology is that when the magnetron is in large amplitude simple harmonic oscillation, a small amplitude simple harmonic signal with a similar frequency and stability is injected into the resonant cavity. When the frequency of the small amplitude simple harmonic signal is close to the simple harmonic oscillation frequency of the magnetron and the coupling is appropriate, the phase difference between the magnetron and the injected simple harmonic signal remains constant; the resonant frequency of the magnetron is pulled to the frequency of the injected signal, at which time the large signal is locked by the injected small signal. When the signal power of the magnetron is constant, the greater the power of the injected signal, the wider the bandwidth of the lockable magnetron. The injection frequency locking technology can well solve the defects of the magnetron as an oscillator, and ensure the power synthesis efficiency in the modularization process.

[0004] However, in addition to the power output from the antenna end, a part of the power generated by the magnetron will inevitably be output from the injection port due to coupling. As the number of magnetrons in each module increases, a larger injection signal is required for injection frequency locking, resulting in a larger power reflected from the injection port, which in turn reduces the output power and efficiency of the magnetron itself, and also causes irreversible damage to the injection microwave power source. SUMMARY

[0005] In view of the deficiencies of the prior art, the application provides a structure for realizing frequency locking of multiple magnetron modules based on single-path injection.

[0006] The technical scheme adopted by the application is as follows:

[0007] The structure for realizing frequency locking of multiple magnetron modules based on single-path injection comprises a microwave power source, a matching load, N magnetron modules and N circulators, wherein N is greater than or equal to 2.

[0008] The microwave power source is configured to generate an initial frequency locking signal.

[0009] The matching load is configured to absorb reflected signals.

[0010] The magnetron module is composed of multiple magnetrons connected together, the frequency locking signal is input through an injection port of the magnetron module to control frequency locking and phase locking of the multiple magnetrons, and the reflected power of the frequency locking signal is output through the injection port to serve as a frequency locking signal of another magnetron module.

[0011] The circulator is a waveguide three-port circulator, comprising a port 1, a port 2 and a port 3, and the frequency locking signal circulates among the ports in sequence; the port 1 is connected to the microwave power source or a port 3 of another circulator, the port 2 is connected to an injection port of the magnetron module, and the port 3 is connected to a port 1 of another circulator or the matching load.

[0012] Further, the microwave power source is connected to the port 1 of the circulator through a standard rectangular waveguide.

[0013] Further, in the magnetron module, the connection mode between the magnetrons is not limited, and the connection mode comprises a linear connection mode, a center connection mode, a ring connection mode and a hybrid connection mode.

[0014] Compared with the prior art, the application has the following beneficial effects:

[0015] In the present application, by using the injection locking theory, a single injection method can effectively lock multiple magnetrons in a module, promote the electron clustering in the magnetron, suppress the mode competition, and realize the stability of the oscillation frequency and phase of multiple magnetrons at a lower cost. When the number of magnetrons in the same module increases, the reflected power coupled from the injection port will also increase and cannot be completely eliminated. If not controlled, it will inevitably cause damage to the microwave power source. The present application ingeniously uses the reflected power of the injection port as the injection source of another magnetron module, injects the reflected power as the frequency locking signal into the magnetron of another module, and achieves the effect of controlling the frequency and phase of multiple magnetron modules using a single injection signal.

[0016] The single injection frequency locking technology of the present application for controlling multiple magnetron modules has the advantages of simple structure, low cost, easy implementation, and can effectively improve the injection locking efficiency, control the frequency and phase of more magnetrons with lower injection power, thereby reducing the injection locking cost of the entire system and effectively protecting the injection microwave power source. It is especially suitable for magnetron array application scenarios. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of Example 1.

[0018] Figure 2 It is a three-dimensional structural schematic diagram of Example 1.

[0019] Figure 3 It is a schematic diagram of linear connection of n magnetrons in each module of the present application.

[0020] Figure 4 It is a schematic diagram of center connection of n magnetrons in each module of the present application.

[0021] Figure 5 It is a schematic diagram of ring connection of n magnetrons in each module of the present application.

[0022] Figure 6 It is a schematic diagram of mixed connection of n magnetrons in each module of the present application.

[0023] Figure 7 It is a schematic diagram of n magnetron modules of the present application.

[0024] 1, magnetron; 2, I-shaped waveguide; 3, standard rectangular waveguide; 4, three-port circulator; 5, matching load. DETAILED DESCRIPTION

[0025] In order to more clearly illustrate the purpose, features and advantages of the present application, the present application will be further described in detail below with reference to the drawings and specific embodiments.

[0026] Embodiment 1

[0027] The structure of this embodiment for realizing frequency locking of two magnetron modules by single injection is shown in Figure 1 Figure 2

[0028] This embodiment includes a microwave power source, a matching load, two magnetron modules and two circulators. The microwave power source is used to generate an initial frequency locking signal. The matching load is used to absorb reflected signals. The magnetron module is composed of three magnetrons connected in a straight line by I-shaped waveguides. The circulator is a waveguide three-port circulator, including port 1, port 2 and port 3. The frequency locking signal circulates among the ports in turn.

[0029] Among them, port 1 of the first circulator is connected to the microwave power source through a standard rectangular waveguide, port 2 is connected to the injection port of the first magnetron module through a standard rectangular waveguide and an I-shaped waveguide, and port 3 is connected to port 1 of the second circulator. Port 1 of the second circulator is connected to port 3 of the first circulator, port 2 is connected to the injection port of the second magnetron module, and port 3 is connected to the matching load.

[0030] The initial frequency locking signal is input from port 1 of the first circulator and input into the injection port of the first magnetron module through port 2. Since the three magnetrons in the first magnetron module are in mutual coupling and phase locking state, when one of the magnetrons occurs injection frequency locking, the magnetrons in the first module are all injection frequency locked when the power of the frequency locking signal reaches a certain level, the frequency is dragged to the injection frequency, and the phase difference remains constant.

[0031] Due to coupling, a part of the power is output from the injection port of the first magnetron module. The reflected power output from the injection port passes through port 2 of the first circulator, port 3 of the first circulator, port 1 of the second circulator and port 2 of the second circulator in turn, and is injected into the second magnetron module as a frequency locking signal. The reflected power output from the injection port of the second magnetron module is absorbed by the matching load through port 2 and port 3. The purpose of controlling the frequency locking of two magnetron modules by single injection is achieved.

[0032] As long as the power of the frequency locking signal is large enough, in principle, multiple magnetrons can be connected in each magnetron module, and the connection mode between the magnetrons in each module is not limited, including straight line connection mode, center connection mode, ring connection mode and mixed connection mode, as shown in Figure 3 Figure 4 Figure 5 Figure 6

[0033] Embodiment 2

[0034] ​​​​​​In order to better illustrate the structure of the single-channel injection realizing the multi-channel magnetron module frequency locking of the present application, the simplest structure of the embodiment 1 is extended to make a more detailed description of the structure of the present application.

[0035] The embodiment is different from the embodiment 1 in that it comprises N magnetron modules and N circulators, as shown in the figure, wherein the port 1 of the first circulator is connected with the microwave power source, the port 2 is connected with the injection port of the first magnetron module, and the port 3 is connected with the port 1 of the second circulator; the port 1 of the second circulator is connected with the port 3 of the first circulator, the port 2 is connected with the injection port of the second magnetron module, and the port 3 is connected with the port 1 of the third circulator; and the N magnetron modules are sequentially connected through the N circulators, and the port 3 of the last Nth circulator is connected with the matching load. Figure 7

[0036] The extended system still adopts the single-channel microwave injection signal, utilizes the signal unidirectional flow characteristics of the circulator, realizes the frequency and phase difference control of the multi-channel magnetron module by only one injection signal, fully utilizes the originally unfavorable injection port reflection signal, controls the frequency and phase difference of another magnetron module, effectively protects the microwave power source, and has certain application potential in the frequency locking and phase locking field of the magnetron array.​

Claims

1. A structure for realizing multi-path magnetron module frequency locking based on single-path injection, characterized in that, The application relates to a microwave power source, and relates to a microwave power source and a microwave power supply system. The microwave power source comprises the following components: a microwave power source, a matching load, N magnetron modules and N circulators, wherein N>=2; the microwave power source is used for generating an initial frequency-locked signal; the matching load is used for absorbing reflected signals; the magnetron module is composed of a plurality of magnetron connections, the frequency-locked signal is input through an injection port of the magnetron module to control the frequency locking and phase locking of the plurality of magnetrons, and the reflected power of the frequency-locked signal is output through the injection port as the frequency-locked signal of another magnetron module; the circulator is a waveguide three-port circulator, which comprises a port 1, a port 2 and a port 3, and the frequency-locked signal is circulated among the ports in sequence; when N=2, the port 1 of the first circulator is connected with the microwave power source, the port 2 is connected with the injection port of the first magnetron module, and the port 3 is connected with the port 1 of the second circulator; the port 1 of the second circulator is connected with the port 3 of the first circulator, the port 2 is connected with the injection port of the second magnetron module, and the port 3 is connected with the matching load; 2. The structure for realizing multi-way module frequency locking of magnetrons based on single-way injection according to claim 1, characterized in that, when N>=3, the port 1 of the first circulator is connected with the microwave power source, the port 2 is connected with the injection port of the first magnetron module, and the port 3 is connected with the port 1 of the second circulator; the port 1 of the second circulator is connected with the port 3 of the first circulator, the port 2 is connected with the injection port of the second magnetron module, and the port 3 is connected with the port 1 of the third circulator; in sequence, the N magnetron modules are connected through the N circulators, and finally the port 3 of the Nth circulator is connected with the matching load.

3. The structure for realizing multi-way module frequency locking of magnetrons based on single-way injection according to claim 2, characterized in that, The microwave power source is connected with the port 1 of the circulator through a standard rectangular waveguide. In the magnetron module, the connection modes among the magnetrons are not limited, and the connection modes include a linear connection mode, a center connection mode, a ring connection mode and a mixed connection mode.

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