Ultralow-temperature complex electromagnetic parameter testing device for waveguide method microwave dielectric material

Abstract

The invention belongs to the technical field of microwave testing, and particularly relates to an ultralow- temperature complex electromagnetic parameter testing device for a waveguide method microwave dielectric material. A test section waveguide with a rectangular cross section is horizontally arranged, a tested microwave dielectric material capable of transmitting microwaves is placed in the middle of an inner cavity of the test section waveguide, the inner cavity of the test section waveguide is separated from the middle, and the two ends of the test section waveguide are respectively provided with a section of temperature isolation waveguide, namely a temperature isolation waveguide I and a temperature isolation waveguide II, with the same size. A waveguide coaxial converter I is arranged at the outer end of the temperature isolation waveguide I, and a waveguide coaxial converter II is arranged at the outer end of the temperature isolation waveguide II; a liquid nitrogen refrigeration cavity surrounds the test section waveguide, a vacuum heat insulation cavity surrounds the liquid nitrogen refrigeration cavity, and a heat preservation layer is arranged on the outer side of thevacuum heat insulation cavity. A rectangular waveguide method testing principle is adopted, and complex electromagnetic parameter testing of the dielectric material from the room temperature to the ultralow temperature of -165 DEG C or below can be achieved.

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 ...

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Problems solved by technology

However, the research on ultra-low temperature testing methods and technologies for the electromagnetic properti

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