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The loss factor of supercooled water at the frequencies 11...180 GHz has beenmeasured. A measuring technique has been proposed, in which wetted nanoporoussilicate materials, silica gels, with the mean diameter of the pores being 6-9nm, were used to obtain deeply supercooled water. Results have been obtainedfor the loss factor of supercooled water, close to volume water for itsproperties, when cooled down to -45 {\deg}C. To ascertain the mechanism of porewater losses, measurements have been made in the range of temperatures 0...-90{\deg}C. The results obtained have demonstrated the existence of significantexcessive losses at the temperatures below -30 {\deg}C, compared to the resultsof computations based on the known models. To allow mathematical description ofthe increment loss factor, a new addend has been introduced as a sum of twoGaussian functions in the formula described in [T. Meissner, F. J. Wentz, IEEETrans. Geosci. Remote Sens. 2004. vol. 42, p. 1836]. One of these functions hasthe extremum near -45 {\deg}C, and the second one has the extremum in the rangeof -60...-70 {\deg}C. Additional attenuation at -45 {\deg}C is supposed to beconnected with the second critical point of water. Attenuation with the centerin the range of temperatures -60...-70 {\deg}C is determined by the emergenceof conductive films at the boundary between the hard matrix and ferroelectricice 0. This modification is a transitional form to ice Ih or ice Ic and isformed at the temperature below -23 {\deg}C.

Loss Factor of Supercooled Water at the Frequencies of 11...180 GHz