Novel method for testing microwave complex permittivity of high-loss liquid and powder materials

Abstract

The invention belongs to the field of electromagnetic parameter testing for microwave and millimeter-wave materials, and relates to an open coaxial resonator, in particular to a novel method for testing the microwave complex permittivity of high-loss liquid and powder materials. According to the method, the resonance frequency and quality factor at the front and the back of a tested microwave material are loaded through the open coaxial resonator, a piece of wine glass furniture is arranged on the open coaxial resonator, the thickness of a sample is loaded, and therefore the complex permittivity of the sample to be tested is calculated. A testing system built according to the method comprises the open coaxial resonator, probes, converters from an SMA to another coaxial connector, cables, a vector network analyzer and the wine glass furniture, wherein the six parts are connected to form the system; the length of the part, extending deep into the resonator, of each probe is adjusted through a coupling adjuster; the quality factor of the system is made maximal at a resonance frequency point, and the resonance frequency f0 and quality factor Q0 of the system at the time are recorded; the material to be tested is placed into the wine glass furniture, flatness of the upper surface of the sample is guaranteed, the thickness d of the sample is measured, and the resonance frequency f1 and quality factor Q1 of the system after the sample is loaded are recorded. The complex permittivity of the material to be tested is calculated according to the parameters obtained previously.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic parameter testing of microwave and millimeter-wave materials, and specifically relates to a complex of high-loss liquid and powder materials composed of a coaxial open resonator (Open Coaxial Resonator) and polytetrafluoroethylene wine glass furniture. Dielectric constant test system. Background technique [0002] As an electromagnetic wave transmission medium, microwave materials have been widely used in various microwave fields, such as microwave circuits, communications, missile guidance, electronic countermeasures, radar stealth, remote sensing and telemetry, etc. The electromagnetic parameters of dielectric materials generally refer to complex permittivity and complex permeability, usually in the form of complex numbers ε(jω)=ε′(jω)-jε″(jω), μ(jω)=μ′(jω)-jμ″ (jω) means that it is the two most basic characteristic parameters describing the interaction between materials and electromagn...

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Problems solved by technology

However, when the loss of the material to be tested is relatively large, the resonance peak of the cavity is submerged, and the test is terminated.

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