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;
Microwave; Absorber; Millimeter; Wave; Porous; Carbon; Material; Free-Space; Method; Reflection; Loss;