Parametric Study of Antenna with Parasitic Element for Improving the Hearing Aids Compatibility of Mobile Phones and the Specific Absorption Rate in the Head

摘要

In this paper, we present a design of a planar inverted F antenna (PIFA) mounted on a ground plane with form factor corresponding to a typical candy bar type of mobile phone. A quarter-wavelength parasitic element is introduced with the objective to both decrease the specific absorption rate (SAR) and improve the level of hearing aid compatibility (HAC). By varying the position of the parasitic element we have achieved reduction in the averaged SAR in the order of 20% in the 1900 MHz GSM band. However, the improvement of HAC due to electric and magnetic fields has been found only marginal.