Study on Contact Error of Reactance Attenuator for High Frequency Standard

概要

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Presented in this paper is a study on how the contact between outer and inner guide tubes of the reactance attenuator (with a wave guide below cutoff) affects the attenuation constant. It has been said up to now that the attenuator needs perfect contact between outer and inner guides. It is proved that the attenuation of the reactance attenuator having imperfect contact between the two guides is in same value as that of the attenuator with perfect contact up to V.H.F. band. In case machine oil (less than 1/100mm thick) is spreaded between the two tubes having a gap of 1/100 to 5/100mm between each other, the error of attenuation is less than 0.05dB for 20dB attenuation. (Gap length is less than 1/4 wavelength.) In consequence, the problem relating to the contact has become very simple in design and construction.
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