Table 6.

Reflection losses of magnetite-based material.

Material	Reflection Losses (RL)	Frequency
Portland cement-based composite with magnetite [64]	RL = −28 dB	3.7 GHz
Cement with Fe3O4 [71]	RL = −16 dB	15.1 GHz
	RL = −22.6 dB	14 GHz