A Novel High Power Microwave and Millimeter Wave Air-cooled Conical Structure Absorbing Dry Load
A high-power, millimeter-wave technology, which is applied to waveguide devices, cooling/ventilation/heating transformation, electrical components, etc. Affect dry load thermal conductivity and other issues to achieve the effect of low cost, small size and wide operating frequency
Active Publication Date: 2020-09-25
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology
However, due to the low thermal conductivity of solid absorbing materials, it affects the overall thermal conductivity of dry loads and restricts the improvement of power capacity.
Therefore, the common dry load power capacity is in the order of tens of watts or hundreds of watts, which cannot meet the requirements for the use of high-power gyrotron TWTs
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[0036] Below in conjunction with the design example and accompanying drawing of a novel dry load working in the Ka wave band, TE01 mode, the present invention is further elaborated:
[0037] Ka-band new dry load technical index requirements:
[0038] Working mode: TE01 mode;
[0039] Working frequency band: Ka band (30GHz-40GHz);
[0040] Reflection parameters: less than -30dB
[0041] Dimensions of dry load: the radius of the bottom microwave input port is 24mm, the overall height is 300mm, and the radial thickness of the heat sink is 40mm. Silicon carbide material is used as the wave-absorbing medium piece, and metal copper is used as the metal heat-conducting piece. The number of wave-absorbing medium pieces and metal heat-conducting pieces Both are 18 pieces.
[0042] Using the electromagnetic simulation software HFSS to optimize the S parameters of the height of the cone structure, the optimization range of the height of the cone structure is from 100mm to 550mm, and t...
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The invention discloses a novel high-power microwave millimeter-wave air-cooled conical structure absorbing dry load, which belongs to the field of high-power microwave and millimeter-wave devices. The structure includes metal heat-conducting sheets and wave-absorbing dielectric sheets arranged alternately periodically, and the metal heat-conducting sheets and wave-absorbing dielectric sheets form a cylindrical structure with a conical cavity inside, and the bottom of the conical cavity is connected to a circular waveguide; the outside of the cylindrical structure A layer of slotted cooling fins is also provided. The wave-absorbing dielectric sheet and the metal heat-conducting sheet are arranged alternately periodically, which can reduce the electromagnetic disturbance in the dry load, thereby reducing the electromagnetic reflection of the dry load. Use the good microwave attenuation characteristics of the absorbing medium to ensure the microwave absorption capacity of the dry load; use the strong thermal conductivity of the metal heat conducting sheet to quickly guide the heat of the absorbing medium into the heat sink to reduce the internal temperature of the load. The invention has the advantages of high power capacity, wide operating frequency range, good stability, small volume, convenient use and low cost.
Description
technical field [0001] The invention belongs to the technical field of high-power microwave and millimeter-wave devices, and specifically relates to a new wide-band high-power dry load applied to a gyrotron traveling wave tube system. Background technique [0002] The gyrotron is a high-power, high-gain, millimeter-wave electric vacuum device with a certain bandwidth. It has important application prospects in the fields of high-resolution millimeter-wave imaging, millimeter-wave countermeasures, and microwave communication systems. The output pulse power of the high-power gyrotron amplifier can reach more than 100 kilowatts, and the average power can reach thousands of watts or even tens of kilowatts. In order to avoid electromagnetic environmental pollution and human damage caused by strong electromagnetic radiation, laboratories generally use absorption loads Electromagnetic energy absorption. According to the level of absorbed power, the absorption load mainly includes l...
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IPC IPC(8): H01P1/26H05K7/20
Inventor 徐勇李洋王兆栋孙淼罗勇
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA