Electronic Resource
[S.l.]
:
American Institute of Physics (AIP)
Review of Scientific Instruments
60 (1989), S. 3242-3248
ISSN:
1089-7623
Source:
AIP Digital Archive
Topics:
Physics
,
Electrical Engineering, Measurement and Control Technology
Notes:
An analysis is presented of the effect on power transfer and noise figure of attenuation in the radiofrequency coaxial cable (coax) between a NMR sample coil and the associated spectrometer. A matching network between the sample coil and the coax, which matches the coil to the coax characteristic impedance, is shown to decrease the noise temperature of the coax by a factor of the Q of the coil. In addition, the usual two-capacitor matching network, which provides a perfect match only if both capacitors are variable, is shown to yield an acceptably small mismatch over a wide range of frequencies even if one capacitor is fixed.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.1140559
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