Conference paper
Ideal Coil Decoupling in Receive Arrays using Negative Resistance Preamplifiers
Center for Hyperpolarization in Magnetic Resonance, Centers, Technical University of Denmark1
Department of Electrical Engineering, Technical University of Denmark2
Center for Magnetic Resonance, Department of Electrical Engineering, Technical University of Denmark3
Electromagnetic Systems, Department of Electrical Engineering, Technical University of Denmark4
This work presents the method of achieving ideal decoupling between elements in a receive coil array. Generally, preamplifier decoupling is limited by nonidealities of the implemented components. It is shown analytically and numerically, that for the ideal (lossless) matching circuits the input resistance of the preamplifier should be zero, while for the realistic lossy case a small negative resistance can be used to achieve ideal decoupling.
Here we use a negative input resistance preamplifier (NIRP) to compensate for the loss of the circuit. The analysis is verified experimentally showing a decoupling of -62 dB when a NIRP with an input resistance of -0.023 ? is used.
| Language: | English |
|---|---|
| Year: | 2018 |
| Proceedings: | Joint Annual Meeting ISMRM-ESMRMB 2018 |
| Types: | Conference paper |
| ORCIDs: | Johansen, Daniel Højrup , Sánchez-Heredia, Juan D. , Zhurbenko, Vitaliy and Ardenkjær-Larsen, Jan Henrik |
