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.
Samenvatting