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Abstract #1710

300 W Modified Class-E RF Amplifiers for 64 MHz Transmit Array System

Fatima tu Zahra1,2, Bismillah Nasir Ashfaq1,2, Berk Silemek2, Ugur Yilmaz,2, Redi Poni3, and Ergin Atalar1,2

1Department of Electrical and Electronics Engineering, Bilkent University, Ankara, Turkey, 2National Magnetic Resonance Research Center (UMRAM), Ankara, Turkey, 3ValoTec,Engineering Consultant, Paris, France

In this work, highly efficient 300 W digitally controlled supply-modulated Class-E amplifiers for two-channel RF transmit array are presented. Load pull analysis is performed for load optimization purposes. Coupling between the transmit coils is measured to be 8% when 12 cm diameter coils are placed with a distance of 7 cm. The performance of amplifiers while working simultaneously at same frequency and at different frequencies is evaluated. MR experiments are conducted and it is observed that MR images show no artifact in the presence of amplifier near transmit coil inside the scanner.

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