Stable-state high-power water load

Abstract

The invention discloses a stable-state high-power water load. The stable-state high-power water load comprises a rectangular wave guide, a circular flange, a metal cavity, a ceramic sheet, a metal ring, a rubber sealing ring, a water inlet joint, a water outlet joint, and the like. One end at the left side of the rectangular wave guide is assembled and connected to a wave guide flange; one end at the right side of the rectangular wave guide is processed to be in the shape of a slope and is assembled and connected to the circular flange; one side, which is close to the metal cavity, of the circular flange is provided with an annular groove; the ceramic sheet is circular, is disposed at the center position of the circular flange, is soldered to the circular flange in a vacuum mode and is simultaneously welded to the circular flange by use of the metal ring to seal the annular groove; the metal cavity is provided with a sealing groove; the inner diameter of the sealing groove is a little bit greater than the outer diameter of the annular groove; the sealing groove is internally provided with the rubber sealing ring; the metal cavity is fastened to the circular flange through a screw; and the metal cavity is welded with the water inlet joint and the water outlet joint. The stable-state high-power water load has the advantages of good microwave performance, large power capacity, good safety, high reliability, capability of one-step weld forming, and the like, thereby being suitable for general application in a microwave transmission system.

Description

technical field [0001] The invention relates to the field of microwave loads, in particular to a steady-state high-power water load. Background technique [0002] A matched load is a one-port component that can fully absorb the input power. It is a short-terminated waveguide or coaxial line in which an absorbing substance is placed. It is often used as a matching standard in microwave measurements; it is used to establish a traveling wave state in a transmission system when adjusting instruments and machines (such as TV transmitters, broadcast transmitters, radars, etc.), and is often used as an equivalent antenna. Its main technical indicators are working frequency band, input VSWR and power capacity. [0003] Water load is a kind of matching load. It is a terminal device that uses water as an absorbing substance to derive heat from the flow of water. The temperature of the inflowing water increases after absorbing microwave power. According to the flow of water and the t...

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Problems solved by technology

[0004] There is a water load in the prior art, which is to place the water tank outside the radiation port of the slope-shaped waveguide to absorb microwaves, use dielectric materials (such as ceramics, polytetrafluoroethylene, etc.) and metal cavities to form the water tank, and slot the metal cavities. Place the rubber sealing ring, press the rubber sealing ring tightly on the dielectric material through screws, seal the metal cavity and the dielectric material, and the dielectric material covers the slope-shaped waveguide port to isolate the waveguide inner cavity from the water tank, such as figure 1 as shown, figure 1 Among them, 1 is the waveguide, 2 is the circular flange, 3 is the metal cavity, 4 is the dielectric material, 5 is the rubber sealing ring, and 6 is the water interface. Although the water load of this structure can be sealed by the rubber sealing ring in the metal cavity body and dielectric materials, but in the process of high-power microwave testing, since the dielectric material can pass through the microwave, the rubber sealing ring directly contacts with the dielectric material, and will continuously absorb part of the microwave energy, and the thermal conductivity of the rubber material itself is very small, so it is difficult to The heat is conducted away, and as the working time prolongs, the rubber sealing ring will eventually soften due to the high temperature, causing the water tank to leak. In addition, with the development of microwave technology, microwave transmission systems with higher power levels require shocks to be filled inside. Higher strength gas is used to replace air, such as nitrogen, sulfur hexafluoride, etc., but the existing technology is to cover the dielectric material on the waveguide port and fasten it with screws, so the gas seal between the dielectric material and the waveguide port cannot be realized.

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