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Research Article | Open Access

Lightweight porous silica foams with extreme-low dielectric permittivity and loss for future 6G wireless communication technologies

Petra S. Pálvölgyi1, Daniel Sebők2, Imre Szenti2, Eva Bozo1, Henri Ervasti1, Olli Pitkänen1, Jari Hannu1, Heli Jantunen1, Marko E. Leinonen3, Sami Myllymäki1, Akos Kukovecz2( ), Krisztian Kordas1( )
Microelectronics Research Unit, Faculty of Information and Electrical Engineering, University of Oulu, P. O. Box 4500, FI-90570 Oulu, Finland
Interdisciplinary Excellence Centre, Department of Applied and Environmental Chemistry, University of Szeged, Rerrich Béla tér 1, H-6720 Szeged, Hungary
Centre for Wireless Communications, University of Oulu, P. O. Box 4500, FI-90570 Oulu, Finland
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Abstract

In the next generation wireless communication systems operating at near terahertz frequencies, dielectric substrates with the lowest possible permittivity and loss factor are becoming essential. In this work, highly porous (98.9% ± 0.1%) and lightweight silica foams (0.025 ± 0.005 g/cm3), that have extremely low relative permittivity (εr = 1.018 ± 0.003 at 300 GHz) and corresponding loss factor (tan δ < 3 × 10-4 at 300 GHz) are synthetized by a template-assisted sol-gel method. After dip-coating the slabs of foams with a thin film of cellulose nanofibers, sufficiently smooth surfaces are obtained, on which it is convenient to deposit electrically conductive planar thin films of metals important for applications in electronics and telecommunication devices. Here, micropatterns of Ag thin films are sputtered on the substrates through a shadow mask to demonstrate double split-ring resonator metamaterial structures as radio frequency filters operating in the sub-THz band.

Keywords

low-permittivity materialslow-loss dielectricstemplated sol-gel synthesissilica foams6G telecommunication

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Nano Research
Volume 14 Issue 5,
May 2021
Pages 1450-1456
DOI: 10.1007/s12274-020-3201-2
Cite this article:
Pálvölgyi PS, Sebők D, Szenti I, et al. Lightweight porous silica foams with extreme-low dielectric permittivity and loss for future 6G wireless communication technologies. Nano Research, 2021, 14(5): 1450-1456. https://doi.org/10.1007/s12274-020-3201-2
Topics:
Cerium compoundsDepositionGel process GelsSilicaSolsSubstrates

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Received: 31 July 2020
Revised: 01 October 2020
Accepted: 15 October 2020
Published: 05 January 2021
© The Author(s) 2020

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