The skin tissue of the human head can play an electromagnetic shielding role in protecting the central organs from microwave exposure. For the electrical properties, however, the published data are for a wide range of tissues from fat (low water content) to muscle (high water content), and thus various electrical properties of the skin tissue are used for SAR calculations in a heterogeneous head model. This paper examines numerically how variations in the electrical properties of the skin tissue affect the SAR in the human head. Skin tissue properties are newly estimated from the Debye equation with two relaxation time constants, which are used to calculate the SAR in the developed heterogeneous head model for 1.5-GHz microwave exposure. The SAR details are compared with the following cases: results computed for skin having the same electrical properties as those of fat, our previously obtained results, and Furse's results on tissue properties. The effects of tissue mass densities on the SAR calculation are also examined. © 1997 Scripta Technica, Inc. Electr Eng Jpn, 120(4): 66–73, 1997
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