A waveguide method microwave dielectric material ultra-low temperature complex electromagnetic parameter testing device

Abstract

The invention belongs to the technical field of microwave testing, and in particular relates to a testing device for ultra-low temperature complex electromagnetic parameters of microwave dielectric materials by waveguide method. The test section waveguide with a rectangular cross section is set horizontally, the microwave dielectric material to be tested that can transmit microwaves is placed in the middle of the test section waveguide cavity, and the test section waveguide cavity is separated from the middle, and the two ends of the test section waveguide are respectively set There is a section of temperature-isolated waveguides of the same size: temperature-isolated waveguide 1 and temperature-isolated waveguide 2, the outer end of temperature-isolated waveguide 1 is provided with waveguide-coaxial converter 1, and the outer end of temperature-isolated waveguide 2 is provided with waveguide-coaxial converter 2 A liquid nitrogen refrigeration chamber is arranged around the outer side of the test section waveguide, a vacuum heat insulation chamber is arranged around the outer side of the liquid nitrogen refrigeration chamber, and an insulation layer is arranged outside the vacuum heat insulation chamber. The invention adopts the testing principle of the rectangular waveguide method, and can realize complex electromagnetic parameter testing of dielectric materials from room temperature to ultra-low temperature -165°C and below.

Description

technical field [0001] The invention belongs to the technical field of microwave testing, and in particular relates to a testing device for ultra-low temperature complex electromagnetic parameters of microwave dielectric materials by waveguide method. Background technique [0002] Microwave refers to electromagnetic waves with very short wavelengths and high frequencies. It is an alternating electromagnetic field that exists in different media. In a broad sense, its frequency ranges from 300MHz to 3000GHz, that is, electromagnetic waves with wavelengths ranging from 1m to 0.1mm. Both can be called microwaves, but electromagnetic waves with a wavelength of less than 1cm to 0.1mm are usually called millimeter waves and submillimeter waves, while electromagnetic waves with a wavelength of more than 1cm to 1m are called microwaves, and the corresponding frequencies are 300MHz to 30GHz. [0003] In recent years, with the steady advancement of space station construction and lunar ...

AI Technical Summary

Problems solved by technology

However, the research on ultra-low temperature testing methods and technologies for the electromagnetic properties of electromagnetic wave absorption and electromagnetic wave shielding materials has not been fully developed.

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