QUASI MICROWAVE ABSORPTION CHARACTERISTIC OF FERRITE AND CARBON MIXED CEMENT MORTAR
Shinji Kawabe, Tetsuo IKEDA, Takeyuki Yasukawa · Journal of Structural and Construction Engineering (Transactions of AIJ) · 2003
The purpose of this study is to minimize difficulties of information transmission with caused by electromagnetic wave reflection at building walls, in using the quasi microwave band for data communication. The electromagnetic material coefficient of each cement mortar is measured by using waveguide and electromagnetic wave absorption characteristic is simulated. As a result, cement mortar mixed with pitch-based carbon fiber or Ni-Zn ferrite had a better absorption characteristic than plain cement mortar. Combination cement mortar mixed with carbon fiber and cement mortar mixed with ferrite is improving in absorption characteristic, therefore proper combination is able to make electromagnetic wave absorber thin.