Ra. Sadeghzadeh et Nj. Mcewan, PREDICTION OF HEAD PROXIMITY EFFECT ON ANTENNA IMPEDANCE USING SPHERICAL WAVE EXPANSIONS, Electronics Letters, 30(17), 1994, pp. 1365-1366
It is shown that, by approximating a human head as a dielectric sphere
, the method of spherical wave expansions can be used to obtain useful
predictions of the effect of the head on the impedance of an adjacent
handset antenna working at similar to 2GHz.