Louise SÉVIN, Wael IDRISSI, Céline LE SINQ, Johan PETIT

DOI Number: N/A

Conference number: HiSST-2025-146

This study focuses on the electromagnetic properties of ceramics for ultra-high temperature radiofrequency (RF) windows. Although silica shows promising transparency properties due to its low dielectric constant (ε), its temperature limit (below 1373K) restricts its application. To overcome this limitation, we aim at reducing the dielectric constant of alternative ceramics while maintaining sufficient thermomechanical resistance. We investigated samples with various porosity levels (5-40%) and designs (gyroids, honeycombs, triangles, stars, and random porous structures) using Fused Deposition Modelling and conventional methods. Notably, our results align with established analytical models,
yielding dielectric constants below 5 for porosities above 35%. Interestingly, the size of the interstices and walls (1500-5000 µm) did not significantly affect the dielectric constant. Moreover, our findings highlight the importance of optimizing structured porosity to balance high flexural strength with reduced dielectric constant.

Read the full paper here

In Categories: 1.Events, 1.HiSST 2025, Materials and Structures for vehicle and all subsystems
Email
Print
LinkedIn
The paper above was part of  proceedings of a CEAS event and as such the author has signed a publication agreement to have their paper published in the repository. In the case this paper is found somewhere else CEAS always links to the other source.  CEAS takes great care in making the correct content available to the reader. If any mistakes are found  in the listings please contact us directly at papers@aerospacerepository.org and we will correct the listing promptly.  CEAS cannot be held liable either for mistakes in editorial or technical aspects, nor for omissions, nor for the correctness of the content. In particular, CEAS does not guarantee completeness or correctness of information contained in external websites which can be accessed via links from CEAS’s websites. Despite accurate research on the content of such linked external websites, CEAS cannot be held liable for their content. Only the content providers of such external sites are liable for their content. Should you notice any mistake in technical or editorial aspects of the CEAS site, please do not hesitate to inform us.