A new borosilicate glass with lower loss and permittivity than any commercial glass has been proposed in this contribution as a substrate or interposer for mm-wave and THz integrated electronics. The glass is composed of a microstructure enclosing high-purity boron rich areas and silicon rich areas. This phase-separated areas are several orders of magnitude smaller than the wavelength at 1 THz.
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Rodriguez-Cano et al. (2024) studied this question.
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