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This paper presents numerical calculations of the field-to-voltage transfer function, i.e. the coupling between GSM and UMTS mobile phones and base stations and the voltage induced at the sensing input of cardiac pacemakers. Furthermore the source impedance of a unipolar electrode is determined numerically. The numerical method is successfully validated by measurements using a homogeneous phantom with tissue simulating liquid. The numerical model considers implantation of the pacemaker in the right pectoral area using a realistic model of the human body as well as different exposure scenarios. The maximum amplitudes of the interference voltage range from 420 mV at 900 MHz for mobile phone use (P = 1 W) in front of the chest and 2.9 mV at 950 MHz for plane wave exposure (E = 1 V/m). The source impedance of a unipolar electrode varies from (44 – j 36) Ω at 900 MHz to (20 – j 12) Ω at 1950 MHz.

INTERFERECE OF ACTIVE MEDICAL IMPLANTS WITH GSM AND UMTS MOBILE PHONES AND BASE STATIONS