Planar resonator sensor for moisture measurements

Skulski, J.; Galwas, B.A.

doi:10.1109/mikon.1998.742805

Cited by 6 publications

(3 citation statements)

References 3 publications

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“…Nowadays it is possible to find several types of microwave-based sensors for diverse applications [1], such as liquid biological and chemical tests [2,3], food and agricultural products [4,5], and measurements of industrial materials [6,7].…”

Section: Introductionmentioning

confidence: 99%

Multi-band microwave sensor based on Hilbert’s fractal for dielectric solid material characterization

Silva

Araújo

Coutinho

et al. 2020

Journal of Electromagnetic Waves and Applications

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A planar sensor designed using the fourth Hilbert fractal curve iteration for solid material characterization at multiple frequencies is reported in this paper. The fractal curve is self-similar with space filling properties. The Hilbert fractal geometry is used to form a compact resonator, with a multiband frequency response where miniaturization is achieved, since a large transmission line length is effectively confined in a limited area. The sensor provides five resonances in the frequency range from 0 to 5 GHz. The resonant frequencies are 0.56, 1.68, 2.72, 3.69 and 4.72 GHz, all used to measure the real permittivity of known samples with a sensitivity of 7, 20, 27, 43 and 50 MHz/permittivity, respectively. The sensor is used to measure dielectric samples with 20 x 20 mm 2 areas with several thicknesses. Simulations and measurements demonstrate that the Hilbert fractal geometry can be used to design a multiband planar sensor for solid dielectric material characterization.

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Section: Introductionmentioning

confidence: 99%

Multi-band microwave sensor based on Hilbert’s fractal for dielectric solid material characterization

Silva

Araújo

Coutinho

et al. 2020

Journal of Electromagnetic Waves and Applications

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show abstract

“…Microwave sensors have been widely used in different types of applications for the characterization of dielectric materials [8]. Microstrip devices are composed of a conductive strip, a dielectric substrate, and a ground plane [9].…”

Section: Introductionmentioning

confidence: 99%

Planar Sensor for Material Characterization Based on the Sierpinski Fractal Curve

et al. 2020

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This paper presents a planar and compact microwave resonator sensor to characterize materials. The geometry of the resonator is based on the Sierpinski fractal curve and has four poles in the frequency range from 0.5 GHz to 5.5 GHz. Any of the four poles can be used to measure samples with low permittivity values, where the first pole is suitable for samples with high permittivity values. The sensitivity of the poles and return losses of the sensor are presented and obtained using a full-wave 3D simulator software. The device is manufactured and validated through a comparison between simulated and measured results.

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“…The loss factor at 18 GHz is modeled as e'; = 15.5m^, (239) where m^is the percent liquid water content; in these formulas m^ranges from to 16. • Soils have been measured by many researchers as functions of organic, sand, clay and water content [222][223][224][225][226][227][228][229][230][231][232] …”

mentioning

confidence: 99%