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Abstract #3119

Evaluation of a modified passive clamp decoupling network at high frequencies

Chathura Kumaragamage 1,2 and Jamie Near 2,3

1 Biomedical Engineering, McGill University, Montreal, Quebec, Canada, 2 The Douglas Brain Imaging Centre, Montreal, Quebec, Canada, 3 McGill University, Montreal, Quebec, Canada

The efficacy of receiver coils decoupling, using clamping diodes on the Tx-line is investigated. We found that signal transmission (S21) is degraded due to impedance mismatching at high frequencies, when simple cross diode shunting is used along the Tx-Line (~8% power loss at 600MHz). A cross diode topology with an added tank circuit was found to improve S21 (~2% power loss at 600MHz). The modified cross diode topology provides an efficient solution for passive decoupling at high-frequencies that is remote to the coil, thus providing a convenient and safe alternative to passive decoupling networks mounted on the receiver coil element.

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