Obviously, increasing number of mobile communications and the users needs significant attention to the interaction between mobile antenna and user has become an important subject for antenna researches. In fact, it has been performed as a small part of a project by an antenna group at Helsinki University of Technology in Finland. The aim of work has been more udersatanding the effect of hand on mobile antenna .For this purpose some electrical antenna parameters such as reflection coefficient, radiation efficiency, total efficiency, gain and directivity have been considered.Definitely, Predicting these parameters will help researchers to design antennas with better performance. The effect is considered with real user and two hand models. The study is based on SEMCAD simulations at two frequency bands (E-GSM 900MHz and GSM 1800MHz.

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