Effect of Laser Ablation on Microwave Attenuation Properties of Diamond Films
At a Glance
Section titled āAt a Glanceā| Metadata | Details |
|---|---|
| Publication Date | 2019-11-09 |
| Journal | Materials |
| Authors | Minghui Ding, Yanqing Liu, Xinru Lu, Weizhong Tang |
| Institutions | Tsinghua University, University of Science and Technology Beijing |
| Citations | 13 |
Abstract
Section titled āAbstractāThermal conductivity is required for developing high-power microwave technology. Diamond has the highest thermal conductivity in nature. In this study, a diamond film was synthesized by microwave plasma chemical deposition, and then long and short conductive graphite fibers were introduced to the diamond films by laser ablation. The permittivity of the samples in the K-band was measured using the transmission/reflection method. The permittivity of diamond films with short graphite fibers increased. The increase in real part of permittivity can be attributed to electron polarization, and the increase in the imaginary part can be ascribed to both polarization and electrical conductivity. The diamond films with long graphite fibers exhibited a highly pronounced anisotropy for microwave. The calculation of microwave absorption shows that reflection loss values exceeding ā10 dB can be obtained in the frequency range of 21.3-23.5 GHz when the graphite fiber length is 0.7 mm and the sample thickness is 2.5 mm. Therefore, diamond films can be developed into a microwave attenuation material with extremely high thermal conductivity.
Tech Support
Section titled āTech SupportāOriginal Source
Section titled āOriginal SourceāReferences
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