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. Author manuscript; available in PMC: 2014 Feb 26.
Published in final edited form as: Proc SPIE Int Soc Opt Eng. 2013 Feb 26;8584:10.1117/12.2003976. doi: 10.1117/12.2003976

Figure 6.

Figure 6

shows the HFSS-simulated receive pattern for the 2.6cm directional beam log spiral antenna when placed on the heterogeneous multilayer human head model. The receive pattern is shown for three specific radiometric sensing frequencies from 1–2GHz. The radiometer tested in this work is sensitive primarily from 1.1 to 1.6 GHz. Note the low signal from skull, which is characterized by low dielectric constant and loss at microwave frequencies, and deep penetration of the field inside the skull.