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A Composite Magnetron Cathode Cable Microwave Leakage Protection Device
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A technology of magnetron cathode and protective device, applied in the field of magnetron, can solve problems such as microwave leakage, and achieve the effect of reducing microwave leakage and solving microwave space radiation
Inactive Publication Date: 2017-11-14
SOUTHWEST JIAOTONG UNIV
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But these two structures have certain defects: for the λ / 4 choke sleeve, because the microwave generated by the magnetron has a certain discrete range, the condition of a quarter wavelength cannot be strictly satisfied, and when the choke sleeve When the microwave energy in the cylinder cannot be consumed in time (over its capacity), the microwave will also leak out
[0003] At present, the method of directly grounding metal connecting wires is generally used for filtering, so that microwaves will inevitably radiate from the grounding wire into the air.
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Embodiment 1
[0031] In this embodiment, a 2.45 GHz magnetron cathode cable microwave leakage protection sleeve is taken as an example for illustration.
[0032] like figure 1 , 2 As shown, the microwave leakage protection device for the cathode cable of the magnetron in this example includes a sleeve 1, a connecting surface 2, an inner conductor 3, a short circuit plate 4, a microwave absorbing material 5, a heat sink 6, a ceramic plate 7, and a bypass capacitor 8 , ceramic sheet 9, decoupling capacitor 10 and insulating ceramic gasket 11. The absorbing material 5 of this example adopts the ECCOSORB SF type absorbing material of Emerson Company, and its electric loss tangent is tanδ E =5. In this example, the bypass capacitor 8 and the decoupling capacitor 10 use TDK ceramic chip capacitors to form a parallel capacitor group, and the corresponding capacitor values are 100pF and 0.1uF. In this example, the connection surface 2, the ceramic sheet 7 and the bypass capacitor 8 are instal...
Embodiment 2
[0035] like image 3 , Figure 4 As shown, in this example, the cooling fins are evenly distributed along the radial direction of the sleeve 1, and the cooling fins are radial. In this example, the heat sink 6 can be formed by welding a rectangular copper sheet on the sleeve. The structure of the microwave leakage protection device for the cathode cable of the magnetron in this example is the same as that of Embodiment 1, and will not be repeated here.
[0036] Adopting the magnetron cathode cable microwave leakage protection device of the present invention replaces the design of the λ / 4 choke sleeve and the LC filter sleeve, reduces the design cost and the complexity of the system, and has the advantages of simple structure, compact size, and convenient processing. The characteristics of low cost and easy production.
[0037]Through actual measurement, before the device of the present invention is installed, the leakage electric field of the external field has reached 20V / ...
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Abstract
The invention discloses a microwave leakage prevention device of composite magnetron cathode cable. Coaxial transmission lines, bypass capacitors, a wave-absorbing material, a decoupling capacitor and a real short-circuit plane structure are adopted by the device, so that microwaves can be strictly limited in a coaxial line system to be filtered and absorbed; and microwave leakage is greatly reduced. Uniform microwave transmission lines are combined with a bypass capacitor bank, the wave-absorbing material and the decoupling capacitor, so that effective filtering and consuming of leaking microwave power are facilitated, the cooling efficiency is improved and an application band is broadened. The problem of microwave leakage generated by the cathode cable under the condition of a magnetron frequency drift is effectively solved; the problem of microwave space radiation of a common cathode LC filter wire is effectively solved; the leaking microwave power of a cathode is timely and effectively consumed; and the microwave leakage prevention device can be applied to continuous-wave, high-power and long-time working cathode microwave leakage prevention and can be applied to cathode microwave leakage prevention of a frequency-modulated magnetron (broadband).
Description
technical field [0001] The invention relates to a magnetron, in particular to a composite type magnetron cathode cable microwave leakage protection device. Background technique [0002] Magnetrons are increasingly used in industrial, scientific and medical (IMS) research, and their fields of application continue to expand. Especially in applications such as material processing and industrial heating, which have the characteristics of continuous wave, high power, and long time, the microwave leakage of the magnetron will seriously affect the normal operation of the control circuit. In addition, in order to ensure the long-term effective operation of electronic products and the electromagnetic protection of the environment, countries have formulated strict electromagnetic compatibility (EMC) standards for electronic products, so the electromagnetic compatibility (EMC) performance of magnetrons must be optimized. When the magnetron is working, the leakage of the cathode lead w...
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