Research of dielectric properties of wood at frequencies 0.1 &amp;#x00F7; 0.5 THz

Suslyaev, V. I.; Kochetkova, Tatiana; Dunaevskii, G. E.; Dorozhkin, K. V.

doi:10.1109/irmmw-thz.2014.6956102

Cited by 9 publications

(5 citation statements)

References 3 publications

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“…It should be emphasized that the parameters of relative permittivity and tangent loss angle have been given in Refs [ 20 , 22 , 23 , 24 , 25 , 26 , 27 , 28 ], and we use these parameters directly in the measured D-band mmWave system. The real part of wood permittivity was measured by a quasi-optical Mach–Zahnder interferometer with a backward-wave oscillator and the result was 1.60–1.89 in the D-band [ 25 ]. However, some of the parameters were not measured in the case of the D-band, so there is a certain error.…”

Section: Methodsmentioning

confidence: 99%

Research on Penetration Loss of D-Band Millimeter Wave for Typical Materials

Wang

et al. 2022

Sensors

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The millimeter-wave frequency band provides abundant frequency resources for the development of beyond 5th generation mobile network (B5G) mobile communication, and its relative bandwidth of 1% can provide a gigabit-level communication bandwidth. In particular, the D-band (110–170 GHz) has received much attention, due to its large available bandwidth. However, certain bands in the D-band are easily blocked by obstacles and lack penetration. In this paper, D-band millimeter-wave penetration losses of typical materials, such as vegetation, planks, glass, and slate, are investigated theoretically and experimentally. The comparative analysis between our experimental results and theoretical predictions shows that D-band waves find it difficult to penetrate thick materials, making it difficult for 5G millimeter waves to cover indoors from outdoor macro stations. The future B5G mobile communication also requires significant measurement work on different frequencies and different scenarios.

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Section: Methodsmentioning

confidence: 99%

Research on Penetration Loss of D-Band Millimeter Wave for Typical Materials

Wang

et al. 2022

Sensors

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“…Wood absorbing heat, due to high power storage (within the frequency range of 100 Hz to 1 MHz), caused a lower dielectric constant due to its high dielectric loss (Babu et al 2010). Suslyaev et al (2014) studied dielectric behavior of 4 types of woods, i.e. birch (Betula pendula), spruce (Picea obovate), cedar (Pinus sibirica), and pine (Pinus sylvestris) in terms of the frequency associated to the complex dielectric constants at a 2% and 4% moisture content in longitudinal and transverse fiber directions, respectively.…”

Section: Introductionmentioning

confidence: 99%

“…birch (Betula pendula), spruce (Picea obovate), cedar (Pinus sibirica), and pine (Pinus sylvestris) in terms of the frequency associated to the complex dielectric constants at a 2% and 4% moisture content in longitudinal and transverse fiber directions, respectively. Suslyaev et al (2014) proposed that the most effective frequencies occurred between 0.1 THz to 0.5 THz, based on four wood species. At room temperature, the dried wood exhibited a decreased dielectric constant as the frequency increased, and anomalous dispersion was observed at 250 GHz at the maximum dielectric loss in the transverse direction (Suslyaev et al 2014).…”

Section: Introductionmentioning

confidence: 99%

“…Suslyaev et al (2014) proposed that the most effective frequencies occurred between 0.1 THz to 0.5 THz, based on four wood species. At room temperature, the dried wood exhibited a decreased dielectric constant as the frequency increased, and anomalous dispersion was observed at 250 GHz at the maximum dielectric loss in the transverse direction (Suslyaev et al 2014). Han et al (2015) found firm evidence that the fundamental thickness, oven-dried thickness, twisting quality, and compressive quality parallel to the adjusted grain of wood demonstrated an undeniable increase in dielectric properties, in contrast with the natural characteristics of wood in terms of its dielectric properties.…”

Section: Introductionmentioning

confidence: 99%

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Dielectric properties of natural Borneo woods: Keranji, Kayu Malam, and Kumpang

Jayamani

Rahman

Hamdan

et al. 2020

BioRes

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The dielectric behavior and properties of three types of Sarawak woods, under various conditions (untreated, alkaline treated, potassium carbonate treated, and heat treated), were investigated and discussed. The dielectric constant, loss, and dissipation factor tests were conducted via a dielectric impedance analyzer. The results revealed that the dielectric properties decreased in relation to an increase in frequency. With considerations to the treatment method, the highest dielectric constant values for the untreated samples were found in Kumpang wood, the highest dielectric constant values for the heat-treated samples and potassium carbonate treated samples were found in Keranji wood, and the highest dielectric constant values for sodium hydroxide treated samples were found in Kayu Malam wood. Therefore, it was evident that the physical properties, e.g., internal structure, density, moisture, temperature, etc., could affect the dielectric behavior and properties of the wood materials.

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“…It was clearly presented that wood's electrical properties such as the dielectric constant were highly affected by parameters like frequency, temperature, moisture content, and density. The dielectric properties of wood and oil palm trunk (OPT) were presented in different features at both THz and MW frequency range, respectively, in [6, 7]. For instances, the dielectric measurement was performed in the THz frequency range for both parallel and perpendicular polarization to the fiber direction of wood.…”

Section: Introductionmentioning

confidence: 99%

Ultra-wideband elliptical patch antenna for microwave imaging of wood

Saeidi

Ismail

Wen

et al. 2019

Int. J. Microw. Wireless Technol.

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This paper presents the design of an elliptical shape ultra-wide band antenna for imaging of wood. The antenna is constructed comprising an elliptical shape of patch loaded by a stub to resonate at lower bands, strip loading at the back, and chamfered ground. Despite having miniaturized dimensions of 20 mm × 20 mm, the proposed antenna shows better results compared to recent studies. The simulation results depict a good ultra-wide bandwidth from 2.68 to 16 GHz, and 18.2–20 GHz. Besides, the proposed antenna has two low-frequency bands at 0.89–0.92 and 1.52–1.62 GHz, maximum gain of 5.48 dB, and maximum directivity of 6.9 dBi. The measurement outcomes are performed in air, plywood, and high-density wood and show a good agreement with the simulated results done using electromagnetic simulator CST. In addition to that, the measurement results of S-parameters, transmitted and received signals show a good agreement with the simulated results. Besides, the measured results illustrate a good isolation and uniform illumination among arrays as well as the received signals' shapes do not change in different environments, but only the amplitude. Hence, the proposed antenna seems to be adequate for microwave imaging of wood.

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Research of dielectric properties of wood at frequencies 0.1 ÷ 0.5 THz

Cited by 9 publications

References 3 publications

Research on Penetration Loss of D-Band Millimeter Wave for Typical Materials

Research on Penetration Loss of D-Band Millimeter Wave for Typical Materials

Dielectric properties of natural Borneo woods: Keranji, Kayu Malam, and Kumpang

Ultra-wideband elliptical patch antenna for microwave imaging of wood

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