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Journal of Sensors
Volume 2016 (2016), Article ID 3480965, 7 pages
Research Article

Optimal Value of Series Capacitors for Uniform Field Distribution in Transmission Line MRI Coils

Technical University of Denmark, 2800 Kongens Lyngby, Denmark

Received 13 August 2015; Revised 20 October 2015; Accepted 4 November 2015

Academic Editor: Guiyun Tian

Copyright © 2016 Vitaliy Zhurbenko. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Transmission lines are often used as coils in high field magnetic resonance imaging (MRI). Due to the distributed nature of transmission lines, coils based on them produce inhomogeneous field. This work investigates application of series capacitors to improve field homogeneity along the coil. The equations for optimal values of evenly distributed capacitors are derived and expressed in terms of the implemented transmission line parameters. The achieved magnetic field homogeneity is estimated under quasistatic approximation and compared to the regular transmission line resonator. Finally, a more practical case of a microstrip line coil with two series capacitors is considered.