Patent ID: 9065161
Filing Date: 2015-06-23
Classification: H01P

Abstract:
1. A multi-resonant compound balun NMR probe comprising: a base including at least one tuning and matching circuit; and a probe body including a segmented main transmission line interconnected to said at least one tuning and matching circuit; a multi-resonant compound balun connected to said main transmission line and a sample coil interconnected to said multi-resonant compound balun and wherein said multi-resonant compound balun includes a transmission line system having a center conductor and at least three concentric shields forming a first transmission line between said center conductor and said first shield, a second transmission line between said first and second shields, and a third transmission line between said second and third shields; said first transmission line receiving unbalanced input/output at least three frequencies at one end and providing a multi-band balanced output/input at the other; said second and third transmission lines forming a choke to suppress the common mode current in the shield of the first transmission line at high frequency.