Homogeneous rf field delay line probe for pulsed nuclear magnetic resonance

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Abstract
The analysis of delay line coils for use in pulsed nuclear magnetic resonance, as carried out by Lowe and Engelsberg, is extended to include magnetic coupling between coil sections. The predicted cutoff frequency for the delay line is found to be considerably extended, and this is experimentally verified. The rf magnetic field distribution is theoretically analyzed for the case of a wide flat coil. The conclusion is that the field should be relatively homogeneous as long as the coil thickness is much smaller than the wavelength of the electromagnetic wave traveling down the coil axis. Several different flat coil designs using distributed capacitance are then described, along with operating characteristics of constructed models. The most successful model had a time delay of 20 nsec and a measured inhomogeneity of 4% at 60 MHz.

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