New type of microwave resonator sensors with waveguide below cut-off

Galwas, B.A.; Piotrowski, J.; Skulski, J.

doi:10.1109/cpem.1996.546623

Cited by 4 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

View full text Add to dashboard Cite

show abstract

“…Microwave sensors for dielectric material characterisations have been widely used for different types of applications [1], such as biological liquid and chemical tests [2,3], industrial materials [4][5][6], food and agricultural products [7][8][9][10][11][12] and medical applications [13].…”

Section: Introductionmentioning

confidence: 99%

Planar sensor for powder grain characterisation

Coutinho

Silva

Oliveira

et al. 2018

IET Microwaves, Antennas & Propagation

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This study presents a microwave planar sensor for characterisation of powdered foods. The sensor is based on four coupled resonators designed to have four poles in the frequency range of 1.0–3 GHz. The pole with more sensitivity is used to measure the samples. The frequency characteristics of the sensor are obtained measuring several well‐known samples. It is used to estimate the permittivity of six types of grains. The grains are two types of oatmeal, three types of corn and wheat flour. The experimental results have shown a sensitivity of 36 MHz/Fm−1. The estimated permittivity of materials can be used as the preliminary data for further investigation.

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“…Many industrial measurements systems operate at extremely difficult conditions, with high level of industrial noise, disturbances and distortions. If a distance between sensors and a central controlling unit is long, than the transmission of measurement data arises to the great problem [4,5]. Application of fiber transmission line could be very helpful and useful because of its natural immunity to electromagnetic interference.…”

Section: Introductionmentioning

confidence: 99%

Optical-microwave transmission system with subcarrier multiplexing for industrial measurement systems

Dawidczyk,

Galwas,

Skulski

et al. 2002

JTIT

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We describe short-distance three-channel optical-microwave link with subcarrier multiplexing for transmission digital and/or analog data between different points of industrial measurement systems. The optical fiber link operates with Fabry-Perot laser at 1300 nm, multimode fiber and PIN photodiode receiver. From microwave point of view three carriers with frequencies 600 MHz, 800 MHz and 1000 MHz were chosen. The structure and main parameters of a link are reported and discussed.

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New type of microwave resonator sensors with waveguide below cut-off

Cited by 4 publications

References 3 publications

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

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

Planar sensor for powder grain characterisation

Optical-microwave transmission system with subcarrier multiplexing for industrial measurement systems

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