Better simple models of human radiofrequency absorption rates for E-polarization at quasi-static frequencies

The existing theory for the quasi-static absorption rate of a lossy dielectric ellipsoid in E-polarization is extended to include cylinders of finite length. The key variable affecting the normalized specific absorption rate (NSAR) of an ellipsoid, prolate spheroid, or cylinder, is shown to be the axial ratio, R = (length/diameter). Very simple formulas are deduced for the NSAR of a prolate spheroid or cylinder with R greater than 6. The quasi-static calculations are confirmed by measurements of the NSAR of a human-sized ellipsoid, prolate spheroid, and cylinder exposed inside a very large TEM cell. The three simple models can only account for between twenty and fifty percent of the measured human NSAR at 10MHz when the standard-model axial ratio of R = 6.34 is used. The best simple models for the quasi-static human absorption rates in E-polarization are shown to be an ellipsoid with R = 9.4 and a cylinder with R = 8.5.