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Abstract #4296

Optimizing Efficiency of Coupled Class-E RF Amplifiers for a Transmit Array System in 1.5 T 

Said Aldemir1, Fatima tu Zahra2, Redi Poni3, and Ergin Atalar4
1Electrical and Electronics Engineering, Bilkent University, Ankara, Turkey, 2-, Ankara, Turkey, 3ETH Zurich, Zurich, Sweden, 4Electrical Electronics Engineering, Bilkent University, Ankara, Turkey

In this work, performance of coupled Class-E amplifiers in a transmit array system is investigated. Conditions for these nonlinear amplifiers to work efficiently with desired output power are determined. Also a tuning procedure mitigating undesired effects of coupling on the performance of these nonlinear amplifiers is explained. Simulations are performed in ADS 2016 with 2 Class-E amplifiers and different coupling levels are tested. MRI experiment is performed in order to observe the effects of coupling on amplifier performance. With contour plots, how overall performance of the system is affected by phase and amplitude of an amplifier channel is investigated.

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