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The Modeling of the Absorbance of Sub-THz Radiation by Human Skin
IEEE TRANSACTIONS ON TERAHERTZ SCIENCE AND TECHNOLOGY
Noa Betzalel, Yuri Feldman, and Paul Ben Ishai
—In the near future, applications will come online that require data transmission in ultrahigh rates of 100 Gbit per second and beyond. In fact, the planning for new industry regulations for the exploitation of the sub-THz band are well advanced under the auspices of IEEE 802.15 Terahertz Interest Group. One aspect of this endeavor is to gauge the possible impact on human health by the expected explosion in commercial use of this band. It is, therefore, imperative to estimate the respective speciﬁc absorptionrates of human tissues. In the interaction of microwave radiationand human beings, the skin is traditionally considered as just an absorbing sponge stratum ﬁlled with water. This approach is justiﬁed when the impinging wavelength is greater than the dimensionsof the skin layer. However, in the sub-THz band this condition is violated. In 2008, we demonstrated that the coiled portion of the sweat duct in upper skin layer could be regarded as a helical antenna in the sub-THz band. The full ramiﬁcations of what these ﬁndings represent in the human condition are still very unclear, but it is obvious that the absorption of electromagnetic energy is governed by the topology for the skin and its organelles, especially the sweat duct.
—5G, helical antenna, human skin, speciﬁc absorption rate (SAR), sub-terahertz (sub-THz), sweat duct
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