DOUBLY BROADBAND TRIPLE RESONANCE OR QUAD RESONANCE NMR PROBE CIRCUIT

摘要

A single NMR sample coil (301) in series with a mid-frequency (MF) tuning inductor grounded at one end is doubly broadbanded using a first high voltage broadband capacitor matching network (303-304) in series with the two coils for the LF tuning and a second high-voltage broadband capacitor matching network (323-324) connected to the junction between the two coils for the MF tuning. Isolation between the MF and LF ports is achieved by proper choice of a plug in isolation capacitor (329) between the two broadband matching networks. An inductively coupled floating HF tank circuit (302, 307) is inserted in series with one of the leads from the sample coil to produce the triple resonance circuit. The tuning elements for this HF tank are mounted on top of the adjacent broadband matching network.