Microwave Sensors for Measuring Permittivity and Permeability of Magnetic Media Materials

Abstract

The invention discloses a microwave sensor for measuring the dielectric constant and magnetic permeability of magnetic medium materials. From the top layer to the bottom layer, it includes a microstrip line structure, a dielectric layer, a metal sheet, and a grooved metal CSRR structure; the grooved metal CSRR structure is composed of inner and outer groove rings, each of which has an opening, and the openings are in the same direction; the inner and outer grooves The two right angles opposite to the opening of the ring are aligned and folded inward. The opening of the outer groove ring extends to the inside and outside of the ring to form a groove. The part between the opening grooves of the outer groove ring is the area with the highest magnetic field intensity. It 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 highest electric field strength, where the sample to be tested is placed to measure the dielectric constant of the sample; it can be used in different areas of the same sensor Simultaneously measure the permittivity and permeability, with extremely high sensitivity and Q value, to ensure the accuracy of the measurement.

Description

technical field [0001] The invention belongs to the field of microwave technology, relates to a microstrip excitation sensor, in particular to a complementary split-ring resonator (complementary split-ring resonator—CSRR)-based sensor for measuring the permittivity and permeability of magnetic media materials Miniaturized microwave sensors. 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 c...

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 resonant sensors have a disadvantage, that is, the resolution will decrease with the expansion of the measurement range

That is, measurements must be made in a narrow band, which makes it difficult to measure magnetic media materials with high permittivity and permeability

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