Rectangular waveguide resonant cavity of U-shaped temperature compensated short circuiter

Abstract

The invention relates to a rectangular waveguide resonant cavity of a U-shaped temperature compensated short circuiter, which can remarkably reduce the influences of temperatures to the TE101mode and Tem0n mode resonant frequencies of the resonant cavity. The ultralow temperature floating U-shaped rectangular waveguide resonant cavity comprises a metal cavity (1), a U-shaped short circuiter (2), a supporting body (3) and one or more input and output coupling devices (4), wherein the U-shaped short circuiter (2) is positioned in the metal cavity (1), one head of the supporting body (3) is connected with a top surface cavity wall (6) of the metal cavity (1), the other head of the supporting body (2) is connected with a bottom surface (5) of the U-shaped short circuiter (2); the U-shaped short circuiter (2), a top surface cavity wall (9) of the metal cavity (1), two side surface cavity walls (10) and upper and lower surface cavity walls (8) of the metal cavity form a resonant space (11) of electromagnetic waves; and the input and output coupling devices (4) are positioned on the top surface cavity wall (9) or the narrow surface cavity wall (10) or the wide surface cavity wall (8) of part of the metal cavity (1) of the resonant space (11).

Description

technical field [0001] The invention relates to a waveguide resonant cavity, in particular to a U-shaped temperature-compensated short circuit rectangular waveguide resonant cavity capable of reducing the temperature drift of the resonant frequency. Background technique [0002] The resonant frequency of a waveguide resonant cavity depends on the shape, size, cavity filling medium and resonant mode of the resonant cavity. When the temperature changes, the size of the resonant cavity will also change due to thermal expansion and contraction of the wall material of the resonant cavity, which will cause a change in the resonant frequency of the resonant cavity, which will adversely affect the performance of the resonant cavity. At present, the known methods to reduce the influence of temperature changes on the resonant frequency of the resonator are mainly to adopt constant temperature measures, or to use cavity materials with small thermal expansion coefficients such as Invar,...

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Problems solved by technology

The main problems of these methods are: the required equipment is complicated, or the magnetic properties of the cavity material limit the application occasions, or additional temperature compensation control devices are required, or the influence of temperature on the resonant frequency of the resonant cavity cannot be greatly reduced

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