A van Vaals Resonator with a Novel Quadrature Drive Circuit
Erickson M, Kurpad K, Grist T
U of Wisconsin Madison
This work describes a quadrature van Vaals resonator. Circular polarization is achieved by a novel drive circuit which uses current baluns in conjunction with hybrid combiners or a simple phasing harness. The coil incorporates provision for independent control of power and phase in each conjugate pair of conductors, and retains all of the advantages of the original van Vaals design. The device is suitable for use in clinical magnets.