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Abstract #4023

Dipole Decoupling with Parasites

Gregor F. Neumann1,2, Mark E. Ladd1,2, and Arthur W. Magill1
1Medical Physics in Radiology, German Cancer Research Center (DKFZ), Heidelberg, Germany, 2Physics & Astronomy, Heidelberg University, Heidelberg, Germany

We investigate the decoupling of a pair of fractionated dipoles using an additional passive parasitic dipole. Decoupling is optimised either geometrically, by adjusting the parasite length and standoff distance from the active dipoles, or by adding resistance and reactance to the parasite centre. Adjusting two parameters allows control over the amplitude and phase of the decoupling signal induced via the parasite, producing very strong decoupling at the target frequency (better than -40 dB). The effect is demonstrated using EM simulation and verified with bench measurements.

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