Microwave sensor for simultaneous measurement of permittivity and permeability of magnetic media materials

Abstract

The invention discloses a microwave sensor for synchronously measuring the dielectric constant and magnetic permeability of magnetic medium materials. From the top layer to the bottom layer, it includes two microstrip line structures, a dielectric layer, a metal sheet, and two grooved metal CSRR structures; the grooved metal CSRR structure is composed of inner and outer groove rings, each of which has an opening, and the opening faces The same; the two right angles opposite to the opening of the inner and outer groove rings are aligned and folded inward, and the opening of the outer groove ring extends to the inside and outside of the ring to form a groove. The sample is used to measure the magnetic permeability of the sample; the part between the two inwardly folded grooves connected at right angles to the inner and outer groove rings is the area with the maximum electric field intensity, and the sample to be tested is placed in this area for measuring the dielectric constant of the sample; the present invention adopts The form of differential structure can be used for differential measurement of permittivity and magnetic permeability, and the influence of environmental factors is eliminated by using relative measurement.

Description

technical field [0001] The invention belongs to the field of microwave technology, and relates to a microstrip line excitation sensor, in particular to a differential microwave sensor for synchronously measuring the permittivity and permeability of magnetic medium materials based on single-ended microstrip line magnetic coupling. Background technique [0002] With the rapid development of microwave technology in many industries (such as military, medical, food, chemical and meteorology, etc.), various types of radio frequency microwave devices have been gradually developed and applied. The electromagnetic properties of magnetic media materials greatly affect the performance parameters of equipment devices, so the research on the electromagnetic properties of magnetic media materials is very important. [0003] The electromagnetic properties of magnetic media materials are characterized by three parameters: permittivity ε, magnetic permeability μ, and electrical conductivity ...

AI Technical Summary

Problems solved by technology

Therefore, the measurement of the permittivity and permeability of the magnetic medium material is independent of each other, and the sensor has a single function, which can only be aimed at the measurement of a certain parameter, and cannot measure the permittivity and permeability at the same time

In addition, the existing microwave sensor measurement basically does not consider the influence of external factors, and environmental factors are the main factors affecting sensor measurement, and the measurement error caused by environmental factors in some occasions cannot be ignored

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