Validation of handset antenna test methods

In this work an investigation of a test method for validating the transmitted power by a mobile handset proposed by Olsson and Larsson (see COST 259 WG2.2, 1998) and by Olsson (see COST 259 WG2.2, Leidschendam, Netherlands, 1999) has been made for 1800 MHz GSM handsets. Test results of 8 commercially available GSM1800 handsets measured in the setup has been compared with measurements of the EIRP (equivalent isotropic radiated power), based on 3D radiation pattern measurements performed in an anechoic room. Comparing the EIRP of the phones with the results obtained in the setup a rather large deviation was observed. The principal difference between the measurement methods is the radio environment. This difference has been investigated in this paper by performing 3D radio environment measurements. The radio environment measurements has been performed at both 900 MHz and 2000 MHz.