A high power microwave energy amplification device

Abstract

The utility model relates to the technical field of microwave energy conversion, specifically relates to a high power microwave energy amplification device, including bottom plate and energy amplification subassembly, energy amplification subassembly includes microwave energy input, microwave energy output, cooling pipeline, two bimodulus adjustment ring, closed loop controller, oval microwave resonant cavity and mounting member, high power microwave energy enters oval microwave resonant cavity through microwave energy input, and energy is exported through microwave energy output after amplification, and cooling pipeline is designed in the inside of oval microwave resonant cavity, and the heat dissipation efficiency is higher, and bimodulus adjustment ring realizes frequency regulation through piezoelectric ceramic strain and thermal expansion compensation, and the automatic tuning of resonant frequency is realized to the closed loop controller based on the real -time frequency tracking of LMS algorithm, and the energy conversion efficiency is low to the energy conversion efficiency low that the traditional spherical resonant cavity high -order mode interference leads to, and the thermal expansion will cause the frequency drift of resonance, and the problem of mechanical tuning response speed is slow.

Description

Technical Field

[0001] This utility model relates to the field of microwave energy conversion technology, and in particular to a high-power microwave energy amplification device. Background Technology

[0002] In the field of microwave energy conversion technology, the resonant cavity, as the core component for energy amplification and conversion, directly affects the working efficiency and stability of the entire device through its structural design and performance. Spherical resonant cavities, due to their structural symmetry, have been used in high-power microwave energy amplification applications.

[0003] In microwave energy amplification applications, traditional spherical resonant cavities suffer from low energy conversion efficiency due to high-order mode interference, and thermal expansion can cause resonant frequency drift; mechanical tuning response is also slow.

[0004] To address the aforementioned issues, there is an urgent need for a high-power microwave energy amplification device that is highly efficient, stable, and has a fast response speed to meet the stringent requirements of modern high-power microwave applications. Utility Model Content

[0005] The purpose of this invention is to provide a high-power microwave energy amplification device, which aims to solve the problems of low energy conversion efficiency caused by high-order mode interference and resonant frequency drift caused by thermal expansion in microwave energy amplification applications of traditional spherical resonant cavities in the prior art; and slow mechanical tuning response speed.

[0006] To achieve the above objectives, this utility model provides a high-power microwave energy amplification device, including a base plate and an energy amplification component. The energy amplification component includes a microwave energy input terminal, a microwave energy output terminal, a cooling pipe, two dual-mode adjustment rings, a closed-loop controller, an elliptical microwave resonant cavity, and a mounting component. The energy amplification component is disposed above the base plate. The elliptical microwave resonant cavity is disposed above the base plate. The mounting component is connected to both the base plate and the elliptical microwave resonant cavity. The microwave energy input terminal is connected to the elliptical microwave resonant cavity and located at one end of the elliptical microwave resonant cavity. The microwave energy output terminal is connected to the elliptical microwave resonant cavity and located at the other end of the elliptical microwave resonant cavity. The cooling pipe is disposed on the inner wall of the elliptical microwave resonant cavity, and the input and output terminals of the cooling pipe pass through the microwave energy output terminal. The two dual-mode adjustment rings are respectively disposed at both ends of the elliptical microwave resonant cavity. The closed-loop controller is disposed above the base plate.

[0007] The mounting components include a support base, a locking frame, and fixing bolts. The support base is fixedly connected to the base plate and is located above the base plate. The support base is in contact with the elliptical microwave resonant cavity. The locking frame is located above the support base and is in contact with the elliptical microwave resonant cavity. The fixing bolts are threadedly connected to the locking frame and the support base in sequence.

[0008] The microwave energy input end and the microwave energy output end each have a docking and fixing hole.

[0009] The base plate has mounting holes.

[0010] This invention discloses a high-power microwave energy amplification device. High-power microwave energy enters the elliptical microwave resonant cavity through the microwave energy input terminal. After amplification within the resonant cavity, the high-power microwave energy is output through the microwave energy output terminal. The cooling pipe is designed inside the elliptical microwave resonant cavity, which provides higher heat dissipation efficiency compared to coiling around the cavity, resulting in a smaller overall device size. Both ends of the elliptical microwave resonant cavity have dual-mode adjustment rings, and frequency adjustment is achieved through piezoelectric ceramic strain and thermal expansion compensation. In this design, dual-end adjustment is faster and more efficient than single-end adjustment in a spherical cavity. The closed-loop controller uses real-time frequency tracking based on the LMS algorithm to automatically tune the resonant frequency. This approach solves the problems of low energy conversion efficiency caused by high-order mode interference in traditional spherical resonant cavities, resonant frequency drift caused by thermal expansion, and slow mechanical tuning response. Attached Figure Description

[0011] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0012] Figure 1 This is a schematic diagram of the high-power microwave energy amplification device of this utility model.

[0013] Figure 2 This is a schematic diagram of the high-power microwave energy amplification device of this utility model.

[0014] 101-Base plate, 102-Microwave energy input end, 103-Microwave energy output end, 104-Cooling pipe, 105-Dual-mode adjustment ring, 106-Closed-loop controller, 107-Elliptical microwave resonant cavity, 108-Support base, 109-Locking bracket, 110-Fixing bolt, 111-Matching fixing hole, 112-Mounting hole. Detailed Implementation

[0015] Please see Figure 1 and Figure 2,in, Figure 1 This is a schematic diagram of the high-power microwave energy amplification device of this utility model. Figure 2 This is a schematic diagram of the high-power microwave energy amplification device of this utility model.

[0016] This utility model provides a high-power microwave energy amplification device, including a base plate 101 and an energy amplification component. The energy amplification component includes a microwave energy input terminal 102, a microwave energy output terminal 103, a cooling pipe 104, two dual-mode adjustment rings 105, a closed-loop controller 106, an elliptical microwave resonant cavity 107, and a mounting component. The mounting component includes a support base 108, a locking bracket 109, and fixing bolts 110. The microwave energy input terminal 102 and the microwave energy output terminal 103 each have a mating fixing hole 111, and the base plate 101 has a mounting hole 112.

[0017] The energy amplification component is disposed above the base plate 101; the elliptical microwave resonant cavity 107 is disposed above the base plate 101; the mounting component is connected to the base plate 101 and the elliptical microwave resonant cavity 107 respectively; the microwave energy input terminal 102 is connected to the elliptical microwave resonant cavity 107 and is located at one end of the elliptical microwave resonant cavity 107; the microwave energy output terminal 103 is connected to the elliptical microwave resonant cavity 107 and is located at the other end of the elliptical microwave resonant cavity 107; the cooling pipe 104 is disposed on the inner sidewall of the elliptical microwave resonant cavity 107; the input and output terminals of the cooling pipe 104 pass through the microwave energy output terminal 103; the two dual-mode adjustment rings 105 are respectively disposed at both ends of the elliptical microwave resonant cavity 107; and the closed-loop controller 106 is disposed above the base plate 101.

[0018] In this embodiment, high-power microwave energy enters the elliptical microwave resonant cavity 107 through the microwave energy input terminal 102. After being amplified in the resonant cavity, the high-power microwave energy is output through the microwave energy output terminal 103. The cooling pipe 104 is designed inside the elliptical microwave resonant cavity 107, which has a higher heat dissipation efficiency than coiling around the elliptical microwave resonant cavity 107, making the entire device smaller. Both ends of the elliptical microwave resonant cavity 107 have dual-mode adjustment rings 105, which achieve frequency adjustment through piezoelectric ceramic strain and thermal expansion compensation. In this design, dual-end adjustment is faster and more efficient than spherical single-end adjustment. The closed-loop controller 106 achieves automatic tuning of the resonant frequency based on real-time frequency tracking using the LMS algorithm. In this way, the problems of low energy conversion efficiency caused by high-order mode interference in traditional spherical resonant cavities, resonant frequency drift caused by thermal expansion, and slow mechanical tuning response speed are solved.

[0019] The elliptical microwave resonant cavity 107 is composed of a metal elliptical shell (major axis 2a, minor axis 2b) and a sapphire dielectric window, and operates in TE111 elliptical mode; 1. Cavity parameters: major axis 2a = 300mm, minor axis 2b = 225mm, material is oxygen-free copper (conductivity ≥58MS / m), surface roughness Ra<0.2μm.

[0020] The dual-mode adjustment ring 105 is a composite structure of annular piezoelectric ceramic (PZT-8) and bimetallic strip, and its deformation Δd is controlled by voltage V and temperature T; the inner diameter of the piezoelectric ring is 225mm and the thickness is 4mm; the length of the bimetallic strip (Invar / Cu) is 50mm and the preload is 300N.

[0021] The closed-loop controller 106 implements the LMS algorithm based on FPGA to generate the tuning voltage V and the temperature compensation current I.

[0022] The cooling pipe 104 has a spiral water channel on the inner wall of the cavity. When the flow rate is 1L / min, the thermal resistance R_th = 0.12K / W and the temperature stability is ±0.1℃.

[0023] Furthermore, the support base 108 is fixedly connected to the base plate 101 and located above the base plate 101, and the support base 108 is in contact with the elliptical microwave resonant cavity 107. The locking frame 109 is disposed above the support base 108 and is in contact with the elliptical microwave resonant cavity 107. The fixing bolt 110 is threadedly connected to the locking frame 109 and the support base 108 in sequence.

[0024] In this embodiment, the elliptical microwave resonant cavity 107 is placed on the support base 108, the locking frame 109 is snapped down, and then fixed with the fixing bolts 110. The structure is simple and easy for workers to install and use.

[0025] Furthermore, the microwave energy input terminal 102 and the microwave energy output terminal 103 each have a docking fixing hole 111.

[0026] In this embodiment, the docking fixing hole 111 is used to dock the input device and the output device, thereby improving the practicality of the elliptical microwave resonant cavity 107.

[0027] Furthermore, the base plate 101 has mounting holes 112.

[0028] In this embodiment, the mounting hole 112 is used to fix the base plate 101 with screws to prevent the entire device from shifting during use.

[0029] based on Figure 2It can be concluded that: after high-power microwave energy is input from the left input terminal, it is amplified in the energy amplification device; after amplification, the high-power microwave is output through the output terminal. When the energy amplification device is working, the resonant frequency of the microwave is precisely controlled by the piezoelectric-thermal dual-mode adjustment mechanism and the closed-loop controller, and the heat generated during the operation is kept constant by the cooling system.

[0030] The working principle of this high-power microwave energy amplification device:

[0031] 1. Elliptical mode field distribution: In the elliptical coordinate system (μ,ν), TE 111 The modal electric field components satisfy:

[0032]

[0033] Where h is the elliptic modulus, β is the propagation constant, and J1 is the first-order Bessel function. The elliptic boundary condition keeps the cutoff frequencies of higher-order modes far from the operating frequency band, and the mode isolation is >40dB.

[0034] Dual-mode tuning mechanism:

[0035] Piezoelectric effect: When a voltage V is applied, the relationship between the radial deformation Δdp of the piezoelectric ring and the frequency shift Δfp is as follows:

[0036]

[0037] Thermal compensation: The relationship between bimetallic strip deformation Δdt and temperature ΔT is as follows:

[0038]

[0039] Where α is the coefficient of thermal expansion, L is the length of the metal sheet, and ν is Poisson's ratio. Through the coordinated control of V and I, continuous frequency tuning within a range of ±80MHz is achieved.

[0040] Adaptive control algorithm: The normalized LMS algorithm is used to update the weights w(n):

[0041] w(n+1)=w(n)+2μe(n)x(n)

[0042] Where μ is the step size factor, e(n) is the frequency error, and x(n) is the input signal. The frequency stability after convergence is ≤ ±0.005%.

[0043] 2. Derivation of energy amplification efficiency

[0044] Considering the elliptic cavity quality factor Q and mode volume Veff, the relationship between input power Pin and output power Pout is as follows:

[0045] Pout=Pin·(1+QLΔω / ω0)24QL2·ηnonl·ηmatch

[0046] Where QL is the loading quality factor, Δω is the frequency deviation, ηnonl is the nonlinear conversion efficiency, and ηmatch is the impedance matching efficiency. When Δω = 0 and ηmatch = 0.95, the maximum gain is:

[0047]

[0048] Experiments show that when QL=6000, Gmax can reach 35dB (input 1kW, output 1.8MW), which is 42% more efficient than the spherical device.

[0049] The achievable benefits include: 1. Mode suppression: Elliptic mode selection results in a stray mode suppression ratio >40dB (spherical device <25dB);

[0050] 2. Extended tuning range: Dual-mode tuning increases the frequency adjustment range to ±80MHz (±30MHz for spherical devices);

[0051] 3. Improved stability: Adaptive control reduces 24-hour frequency drift to <0.03% (for spherical devices, >0.2%).

[0052] 4. Efficiency optimization: The nonlinear conversion efficiency ηnonl is improved to 0.85 (0.65 for spherical devices).

[0053] The above-disclosed embodiments are merely preferred embodiments of this application and should not be construed as limiting the scope of this application. Those skilled in the art will understand that all or part of the processes for implementing the above embodiments, and equivalent variations made in accordance with the claims of this application, still fall within the scope of this application.

Claims

1. A high-power microwave energy amplification device, characterized in that, It includes a base plate and an energy amplification component, wherein the energy amplification component is disposed above the base plate; The energy amplification component includes a microwave energy input terminal, a microwave energy output terminal, a cooling pipe, two dual-mode adjustment rings, a closed-loop controller, an elliptical microwave resonant cavity, and a mounting component. The elliptical microwave resonant cavity is disposed above the base plate. The mounting component is connected to both the base plate and the elliptical microwave resonant cavity. The microwave energy input terminal is connected to the elliptical microwave resonant cavity and located at one end of the cavity. The microwave energy output terminal is connected to the elliptical microwave resonant cavity and located at the other end. The cooling pipe is disposed on the inner wall of the elliptical microwave resonant cavity, with its input and output terminals passing through the microwave energy output terminal. The two dual-mode adjustment rings are respectively disposed at both ends of the elliptical microwave resonant cavity. The closed-loop controller is disposed above the base plate.

2. The high-power microwave energy amplification device as described in claim 1, characterized in that, The mounting components include a support base, a locking frame, and fixing bolts. The support base is fixedly connected to the base plate and is located above the base plate. The support base is in contact with the elliptical microwave resonant cavity. The locking frame is located above the support base and is in contact with the elliptical microwave resonant cavity. The fixing bolts are threadedly connected to the locking frame and the support base in sequence.

3. The high-power microwave energy amplification device as described in claim 2, characterized in that, The microwave energy input terminal and the microwave energy output terminal each have a docking and fixing hole.

4. The high-power microwave energy amplification device as described in claim 3, characterized in that, The base plate has mounting holes.

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