MICROWAVE DIELECTRICS FOR APPLICATIONS IN THE 5G FR3 RANGE DOI Open Access
Oleksandr Fedorchuk, O. I. V’yunov, Tetiana Plutenko

et al.

Ukrainian Chemistry Journal, Journal Year: 2024, Volume and Issue: 90(4), P. 60 - 72

Published: May 27, 2024

The 5G FR3 band requires low-permittivity materials. Spinel-structured materials, like SrY2O4, are promising due to their high Q-factor and tunability. However, practical performance limits in terms of frequency range need further investigation. Planar technologies microstrip lines metamaterials, using these materials as substrates, can enable efficient high-frequency devices for beyond. This study aimed synthesize ceramic with the compositions SrY2O4and SrYSmO4, possessing a spinel structure, investigate properties. potential application millimeter-wave instruments was explored by mo­deling spectral characteristics antennas utilizing substrates comparing results those obtained from li­terature-reported High-purity (≥99%) SrCO3, CaCO3, Sm2O3, Y2O3 powders were employed starting Stoichiometric quantities raw mixed, ball-milled, dried, sieved, calcined, re-milled. A binder added, mixture pressed into pellets. green compacts sintered at temperatures ranging 1480 1560 °C durations 2–6 hours, heating cooling rate 200 °C/h. quality factor Q×f = 89400 11 GHz achieved dielectric permittivity εr 15.4 near zero temperature coefficient permittivity/frequency TКε. substitution yttrium samarium decreased permitti­vity 9.4 but significantly reduced material Q·f 17800. SrY2O4 meets requirements centimeter wave range. It surpasses most millimeter presented literature set. Modeling an antenna cell based on double split-ring resonator showed possibility metamaterials made prepared 8.6–11 adjacent ranges, which used satellite communication television systems, aviation, weather, police radars, line-of-sight (LOS) systems electronic news gathering (ENG) systems.

Language: Английский

Low-frequency Broadband Metamaterials for Ventilated Acoustic Insulation DOI
Hao-Bo Qi, Shi-Wang Fan, Mu Jiang

et al.

International Journal of Mechanical Sciences, Journal Year: 2025, Volume and Issue: unknown, P. 110044 - 110044

Published: Feb. 1, 2025

Language: Английский

Citations

1
An innovative hierarchical design of hybrid meta-structures for longitudinal waveguides DOI
M. Heshmati, S.K. Jalali, Nicola M. Pugno

et al.

International Journal of Mechanical Sciences, Journal Year: 2025, Volume and Issue: unknown, P. 109963 - 109963

Published: Jan. 1, 2025

Language: Английский

Citations

0
Investigation of the Heat Treatment Regimes on the Structure and Microhardness of Laser Direct Energy Deposition Aluminum Alloy AlSi10Mg DOI Creative Commons
Darya Volosevich,

Zhanna Shabunina,

�. N. Yurchenko

et al.

Metals, Journal Year: 2025, Volume and Issue: 15(1), P. 92 - 92

Published: Jan. 18, 2025

This study investigates the influence of various heat treatment regimes on structure and microhardness aluminum alloy AlSi10Mg processed by L-DED method. The considers for solid solution in temperature range 500−540 °C with holding times 30–120 min, as well artificial aging 160−190 4–8 h. As a result studying mechanical properties heat-treated samples, it became clear that optimal regime can be considered 500 30 min followed 190 6 leads to formation uniform breakage eutectic network into separate spherical silicon inclusions. this case is 90 HV, which 55% higher than initial state. Using TEM, was established reason increase hardness nanoscale inclusions β″ (Mg5Si6).

Language: Английский

Citations

0
Conformal 3D printing towards shape-conformal batteries: a topical review DOI Creative Commons
Changyong Liu, Chen Li, Jie Li

et al.

Virtual and Physical Prototyping, Journal Year: 2025, Volume and Issue: 20(1)

Published: Feb. 11, 2025

Language: Английский

Citations

0
Effect of Laser Power on Hydrogen Embrittlement and Microstructural Evolution in Selective Laser Melted 304 L Austenitic Stainless Steel DOI
Chilou Zhou,

Xinrui Yan,

Yulin Long

et al.

Corrosion Science, Journal Year: 2025, Volume and Issue: unknown, P. 112814 - 112814

Published: Feb. 1, 2025

Language: Английский

Citations

0
Metamaterial-Integrated Wearable UWB Antenna with SAR Reduction and Gain Enhancement for Wireless Body Area Sensor Networks (WBASNs): Design and Experimental Verification DOI
Saïd Douhi,

Yassir Houssaini,

Sudipta Das

et al.

Sensors and Actuators A Physical, Journal Year: 2025, Volume and Issue: unknown, P. 116499 - 116499

Published: March 1, 2025

Language: Английский

Citations

0
MICROWAVE DIELECTRICS FOR APPLICATIONS IN THE 5G FR3 RANGE DOI Open Access
Oleksandr Fedorchuk, O. I. V’yunov, Tetiana Plutenko

et al.

Ukrainian Chemistry Journal, Journal Year: 2024, Volume and Issue: 90(4), P. 60 - 72

Published: May 27, 2024

The 5G FR3 band requires low-permittivity materials. Spinel-structured materials, like SrY2O4, are promising due to their high Q-factor and tunability. However, practical performance limits in terms of frequency range need further investigation. Planar technologies microstrip lines metamaterials, using these materials as substrates, can enable efficient high-frequency devices for beyond. This study aimed synthesize ceramic with the compositions SrY2O4and SrYSmO4, possessing a spinel structure, investigate properties. potential application millimeter-wave instruments was explored by mo­deling spectral characteristics antennas utilizing substrates comparing results those obtained from li­terature-reported High-purity (≥99%) SrCO3, CaCO3, Sm2O3, Y2O3 powders were employed starting Stoichiometric quantities raw mixed, ball-milled, dried, sieved, calcined, re-milled. A binder added, mixture pressed into pellets. green compacts sintered at temperatures ranging 1480 1560 °C durations 2–6 hours, heating cooling rate 200 °C/h. quality factor Q×f = 89400 11 GHz achieved dielectric permittivity εr 15.4 near zero temperature coefficient permittivity/frequency TКε. substitution yttrium samarium decreased permitti­vity 9.4 but significantly reduced material Q·f 17800. SrY2O4 meets requirements centimeter wave range. It surpasses most millimeter presented literature set. Modeling an antenna cell based on double split-ring resonator showed possibility metamaterials made prepared 8.6–11 adjacent ranges, which used satellite communication television systems, aviation, weather, police radars, line-of-sight (LOS) systems electronic news gathering (ENG) systems.

Language: Английский

Citations

0