Dual-band lossless dielectric constant measurement sensor based on spiral resonator

Abstract

The invention discloses a dual-band lossless dielectric constant measurement sensor based on a spiral resonator, the sensor is a two-port device, the sensor is composed of a dielectric layer, a metal patch layer and a grounding layer, the sensor generates two resonance points in a frequency range of 1GHz-4GHz, the measurement of the dielectric constant and the dielectric loss angle tangent at the two frequency bands of 1.0 GHz-2.0 GHz and 2.1 GHz-3.1 GHz can be realized; and the invention has the advantages of simple structure, high Q value, high sensitivity, low processing difficulty and low cost.

Description

technical field [0001] The invention belongs to the technical field of microwave sensors, in particular to a dual-band non-destructive dielectric constant measurement sensor based on a spiral resonator. Background technique [0002] The dielectric constant refers to the ability of the electrolyte to bind charges. The larger the dielectric constant, the stronger the ability to bind charges, and the better the insulation performance of the material; The energy lost under heat; with the rapid development of microwave technology, the selection of dielectric materials is becoming more and more important in practical applications, and the dielectric constant and dielectric loss are two important parameters to measure the performance of dielectric materials; for example, the manufacture of capacitors The material of the material requires the dielectric constant to be as large as possible and the dielectric loss to be as small as possible; on the contrary, the material for manufactu...

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Problems solved by technology

[0003] In practical applications, microwave sensors based on SRR or CSRR are mostly used to characterize the dielectric constant and dielectric loss tangent of materials. However, when this type of microwave sensor is loaded with samples of different dielectric materials, the test results are affected by the samples. The thickness of the microwave sensor has a great influence, so when the thickness of the sample to be tested is different, the dielectric constant and dielectric loss tangent obtained through the inversion of the test results may be quite different; in addition, the S21 amplitude of the resonant frequency point of this type of microwave sensor Usually small, so the quality factor calculated from the S21 amplitude is also small, which limits the longitudinal sensitivity of the microwave sensor

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