Abstract
This paper deals with the influence the presence of a person has on the performance of antennas for hand-held portable telephones. It is shown how input impedance, far-field radiation pattern, radiation efficiency and the magnitude of the near-field are affected by the presence of the human body. The investigations have been carried out by applying the Finite Difference Time Domain technique to a model of the telephone with a h/4-monopole antenna and a simple hand-head model of the operator. Results from this configuration are compared with results for telephone box and antennna alone. Measurements have been performed to verify the results obtained by simulations.