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Millimeter-Wave Absorption Properties of Thin Wave Absorber in Free Space with New Porous Carbon Material
Department of Communications Engineering, National Defense Academy, Yokosuka-shi, Japan
Department of Communications Engineering, National Defense Academy, Yokosuka-shi, Japan
Department of Materials Science, Osaka Prefecture University, Osaka, Japan
Microwave Absorbers Inc., Tokyo, Japan
KamakamiArchitecture Design and Quantity Surveying Office, Yamagata, Japan
- 1 Department of Communications Engineering, National Defense Academy, Yokosuka-shi, Japan
- 2 Department of Communications Engineering, National Defense Academy, Yokosuka-shi, Japan
- 3 Department of Materials Science, Osaka Prefecture University, Osaka, Japan
- 4 Microwave Absorbers Inc., Tokyo, Japan
- 5 KamakamiArchitecture Design and Quantity Surveying Office, Yamagata, Japan
Wireless Engineering and Technology·Volume 08 (2017)·Pages 51–58·Published 11 September 2017·DOI10.4236/wet.2017.83004
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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 permittiv ity 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.
KeywordsMicrowave AbsorberMillimeter WavePorous Carbon MaterialFree-Space MethodReflection Loss
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