V. V. Meriakri, E. E. Chigryai, M. P. Parkhomenko, R. N. Denisyuk, S. V. von Gratowski

Millimeter electromagnetic waves are applied to the determination of the composition of mixtures of mineral diesel fuel (MDF) and biodiesel (BDF) fuel. Dielectric properties of RME-type BDF are measured in the frequency range from 30 to 100 GHz. These measurements have shown that the real part of the BDF permittivity in the MM wave band is significantly smaller than the value, available in the literature, measured at frequencies of 1 - 3 GHz. This fact is indicative of the presence of a dispersion region in the frequency interval from 3 to 30 GHz, which was also confirmed by the measurements of the loss factor of MM waves in BDF. The loss factor of BDF monotonically increases from 6 to 10 dB/cm as frequency increases from 30 to 90 GHz, while the loss factor of MDF is not greater than 0.1 dB/cm.