CRYOGENIC PROBE WITH LOW-LOSS TRANSMISSION-LINE FOR NUCLEAR-MAGNETIC-RESONANCE

In the design and construction of NMR probes, it is frequently useful to have the tuning elements remote from the NMR coil and sample space, In such cases, a transmission line is an integral part of the resonance circuit. The characteristics of transmission lines are considered and a design for a low-loss transmission line probe is given, The impedance transformation characteristics of low-loss transmission lines are used in several cryogenic probes including singly and doubly tuned probes, Although a low-loss transmission line improves the efficiency of the probe, it may not be the dominant factor in maximizing energy transfer to the NMR coil. (C) 1995 Academic Press, Inc.