New Methods for Measurement of Complex Permittivity up to 13 GHz and their Application to the Study of Dielectric Relaxation of Polar Liquids Including Aqueous solutions

High frequency dielectric measurements, until recently the exclusive prerogative of point-by-point frequency domain methods, can now be made with very reasonable precision in the time domain. These novel methods which are an extension of the earlier reported Time Domain Reflectometry technique yield dielectric information over a range equivalent in frequency to about 10 MHz to 13 GHz. The theoretical basis of these methods is given and their accuracy demonstrated by reference to measurements on water and ethanol. An example of their application to aqueous systems is also given. Hochfrequenzmessungen an Dielektrika, die bisher nur durch “Punkt-fur-Punkt”-Methoden im Frequenzgebiet (frequency domain) ausfuhrbar waren, konnen jetzt mit guter Prazision im Zeitgebiet (time domain) ausgefuhrt werden. Diese neuen Methoden, die eine Verbesserung fruher berichteter Zeitgebiet-Reflektionsmethoden darstellen, gestatten die Ermittlung dielektrischen Verhaltens fur einen Frequenzbereich von etwa 10 MHz bis 13 GHz. Die theoretische Basis dieser Methode wird erlautert und ihre Prazision dargelegt durch Messungen an Wasser und an Athanol. Ein Beispiel ihrer Anwendung auf wasserenthaltende Systeme wird vorgelegt.

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