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

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/cm 3 ), that hav...

Full description

Saved in:
Bibliographic Details
Published inNano research Vol. 14; no. 5; pp. 1450 - 1456
Main Authors Pálvölgyi, Petra S., Sebők, Daniel, Szenti, Imre, Bozo, Eva, Ervasti, Henri, Pitkänen, Olli, Hannu, Jari, Jantunen, Heli, Leinonen, Marko E., Myllymäki, Sami, Kukovecz, Akos, Kordas, Krisztian
Format Journal Article
LanguageEnglish
Published Beijing Tsinghua University Press 01.05.2021
Springer Nature B.V
Subjects
Online AccessGet full text

Cover

Loading…
More Information
Summary: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/cm 3 ), that have extremely low relative permittivity ( ε r = 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.
ISSN:1998-0124
1998-0000
DOI:10.1007/s12274-020-3201-2