Development of epoxy-based millimeter absorber with expanded polystyrenes and carbon black. (arXiv:2210.16202v1 [astro-ph.IM])

Development of epoxy-based millimeter absorber with expanded polystyrenes and carbon black. (arXiv:2210.16202v1 [astro-ph.IM])
<a href="http://arxiv.org/find/astro-ph/1/au:+Inoue_Y/0/1/0/all/0/1">Yuki Inoue</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Hasegawa_M/0/1/0/all/0/1">Masaya Hasegawa</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Hazumi_M/0/1/0/all/0/1">Masashi Hazumi</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Takada_S/0/1/0/all/0/1">Suguru Takada</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Tomaru_T/0/1/0/all/0/1">Takayuki Tomaru</a>

A radio wave absorber induces technology innovation in the fields of
astrophysics, industrial application for communication, and security. We
recently developed and characterized an absorber for millimeter wavelengths.
The absorber consists of epoxy, carbon black, and expanded polystyrene beads.
The typical diameter of polystyrene beads corresponds to the scale of Mie
scattering for the multi-scattering of photons in the absorber. The wide
directivity of Mie scattering increases the effective length of the mean free
path in the absorber. By applying this effect, we succeeded in improving the
performance of the absorber. We characterized the reflectance and transmittance
of the absorber in millimeter length and also measured the transmittance in
sub-millimeter wavelength.

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