Contents I. Introduction
User's hand effects on the antennas of hand-held devices, such as mobile phones and PMPs (Portable Media Players), have been known to be significant, and a number of studies have been available in the open literatures [1]–[3]. In these studies, the hand model with multilayer muscle and bones are usually used in the simulation study. Although more accurate results may be obtained, the simulation time usually takes more than one hour on a regular personal computer. In this paper we propose a one-layer simplified hand model incorporating the use of 3D FDTD simulation software, SPEAG SEMCAD-X (Simulation platform for EMC, Antenna design, and Dosimetry) [4] for achieving efficient simulation for hand-held device antennas. The case of the GSM/DCS internal mobile phone antenna [5] with the proposed hand model is first presented. Effects of the proposed hand model including the user's forearm on the impedance and radiation characteristics of the internal antenna are analyzed. A second case of the DTV antenna in the PMP device with proposed hand model is also studied.
