7T Coil Decoupling in Near-Magnet Power Amplifier

For Tx arrays, the concept of mismatched termination of coils by power amplifiers (PA) for coil isolation has been proposed. This contribution presents an investigation by using the output impedance of a 1 kW power amplifier which was designed for a 7 Tesla 32 channel near-magnet Tx array. Isolation performance is proven by a measurement using a pair of decoupled pick-up coils and EM simulations of coupled coils terminated by the PA output impedance as well as of the PA large-signal reflection coefficients as function of output power or (coupled) reverse power.

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