TITLE:
Millimeter-Wave Absorption Properties of Thin Wave Absorber in Free Space with New Porous Carbon Material
AUTHORS:
Toshihisa Kamei, Hiromi Shima, Takashi Yamamoto, Satoshi Ogino, Seishiro Ishii
KEYWORDS:
Microwave Absorber, Millimeter Wave, Porous Carbon Material, Free-Space Method, Reflection Loss
JOURNAL NAME:
Wireless Engineering and Technology,
Vol.8 No.3,
July
5,
2017
ABSTRACT: In this
paper, we focus on PHYTOPOROUS, a porous carbon material
made entirely from plant-based ingredients, as a new broadband-wave absorber
material that acts in the millimeter wave band. We created prototypes of thin
rubber-sheet wave absorbers that contain porous carbon (PHYTOPOROUS) made from
rice chaff and soybean hulls, which are both agricultural residue products that
are generated in large quantities. We investigated the permittivity and reflectance characteristics of this
material using the free-space time-domain method. The thin rubber-sheet
wave absorber that contained PHYTOPOROUS made from soybean hulls
exhibited a frequency band that was approximately 18 GHz wide and centered at
90 GHz. The return loss for this material was greater than −20 dB. This
demonstrates that the material provides nearly constant reflection absorption
over a wide frequency band.