Novel high-power millimeter-wave bipyramidal water load

Abstract

The invention discloses a novel high-power millimeter-wave bipyramidal water load, and belongs to the technical fields of microwave power absorption and measurement. The water load comprises a circular waveguide and a bipyramidal water load, wherein one end of the circular waveguide is connected with the output radiation waveguide of a gyrotron traveling wave tube, and the bipyramidal water load is connected with the other end of the circular waveguide; the bipyramidal water load consists of inner and outer shells with circular bottoms and conical top parts to form a hollow water chamber; and a water outlet is formed in the top of the outer layer conical shell while a water inlet is formed in the circular bottom. By adoption of the novel high-power millimeter-wave bipyramidal water load, electromagnetic reflection in the water load can be effectively reduced, so the design purpose of broadband low reflection is realized; and meanwhile, by virtue of the bipyramidal structure, the volume of the water load is reduced, the water flow speed on the inner wall of the water chamber is improved, and the problem of partial overheat of the water chamber is solved, so that the working performance of the water load can be effectively improved.

Description

technical field [0001] The invention belongs to the technical field of microwave power absorption and measurement, and in particular relates to a novel broadband high-power-capacity water load applied in a high-power millimeter-wave system. Background technique [0002] With the breakthrough of millimeter-wave technology in recent years, millimeter-wave electric vacuum devices have important application prospects in the fields of high-resolution millimeter-wave imaging, millimeter-wave countermeasures, and microwave communication systems. The output power of high-power millimeter-wave systems 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, and to achieve high-power microwave detection, laboratories generally use absorption loads for electromagnetic energy absorption. Absorbing loads are classified according to the magnitude of the absorbed power, inc...

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Problems solved by technology

The water load of the inclined water pipe structure has the characteristics of low reflection, but due to the small contact area between the water chamber and the microwave, the heat dissipation area is limited, resulting in insufficient power capacity, and it is impossible to achieve high-power microwave measurement absorption

The conical structure and inclined trapezoidal structure have a wide operating frequency band for water loads, but because the water chamber is placed inside the waveguide, it is prone to glass breakage, water leakage, etc., and the safety is poor

The radiating water load (d) absorbs electromagnetic energy through port radiation. The structure is simple and effectively solves the problem of glass fragility and water leakage in the absorbing load. However, the working bandwidth of this radiating water load structure is narrow and cannot meet the broadband requirements Requirements for Microwave Absorption Measurements

In order to improve the working bandwidth and power capacity of the water load, a variety of design methods and measures have been tried, such as the improved radial water load shown in Figure (e), this structure solves the problem of narrow working bandwidth of the traditional radial water load, Effectively broaden the working frequency band of the water load, but the above four water loads (b), (c), (d) and (e) all have the problems of too large water chamber volume and slow water flow velocity on the inner wall of the water chamber. When the input power is large, the water near the inner wall of the water chamber is prone to gasification, which will cause excessive pressure in the water chamber and cause the glass to burst

Therefore, the power capacity of the water load of the above four structures is small, which cannot meet the high power requirements of tens of kilowatts of high-power millimeter-wave electric vacuum devices.

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