Abstract
This paper presents two complementary split-ring resonator (CSRR)-based sensors for full characterization of magneto-dielectric materials. The first proposed sensor is designed by loading the microstrip line with a CSRR, while the second one is by loading the microstrip line with two CSRRs. To distinguish the effects of permittivity and permeability on the shift of resonant frequency, the electric and magnetic fields are designed to be located at two separate zones in the CSRR. Two 50Ω resistors are mounted at the ends of the microstrip line to increase the quality factor. In addition, the second sensor can perform measurements of complex permittivity and complex permeability of the magneto-dielectric materials in a single run, thereby making the measurement faster, easier, and in a more cost-effective way. The prototypes of two proposed sensors are fabricated and tested for validation of their functionality. A good agreement can be achieved between the measured data and the reference values from the manufacturers' datasheet, thereby demonstrating the applicability of the proposed sensors for full characterization of the magneto-dielectric materials.
Highlights
Material detection technology plays an increasingly important role in many fields such as structural health monitoring [1]–[3], industrial manufacturing [4], [5], and biomedical research [6], [7]
In this work, two sensors were proposed for full characterization of the MD materials
The first sensor was designed by loading the microstrip transmission line with an improved complementary split-ring resonator (CSRR)
Summary
Material detection technology plays an increasingly important role in many fields such as structural health monitoring [1]–[3], industrial manufacturing [4], [5], and biomedical research [6], [7]. CSRR-LOADED MICROSTRIP LINE In the applications of microwave resonator-type sensor, the variation of the notch magnitude can be used to extract the loss tangent of material under test (MUT). As there is almost no electric field in the Cu gap between two slots (see Fig. 8(b)), the variations of the complex permittivity have negligible influence on the sensor response including the resonant frequency and the quality factor. 13(a) and 13(b) show the transmission coefficients of the proposed CSRR-based sensor when the real part εr of the relative permittivity and electric loss tangent tan δe are varied from 1 to 10 and from 0 to 0.1, respectively. Both the magnetic and electric loss tangents of the MUT is set as zero. The electric loss tangent tan δe is obtained by substituting εr, tan δm, and the measured Qn1 into the fitted equation (4)
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