導波管減衰器用抵抗板

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The carbon-and metal-film on a dielectric base are widely used as resistive strip for waveguide attenuators. It is required as a resistive strip that there are not any resistance change of strip with time. Some papers for temperature and humidity tests were reported in the past, but there are no reports for aging test which carried out for several years. In this paper, in order to determine the relative merits of certain materials used as microwave attenuators, many materials and depositing methods were tried, and resistance change with the condition of the atmosphere were observed for three years. Then it is tried to improve the stability of resistive sheet, and is also obtained data to design attenuators. When the observations are extend for several years, there are phenomena which are considerably different from former temperature and humidity tests which were measured for short duration. For most attenuator applications, the film thickness is less than the depth of current penetration even at the highest microwave frequency. Because of thickness of the film, it has been treated that the resistive film acts like a pure conductance. But, it is found by experiments that the carbon film has considerable capacitive susceptance, on the other hand metal film can be regarded as pure conductance. In this paper, variations of the effective admittance of the resistive film with d-c resistance, thickness of film and frequency are discussed, and are obtained the practical data for microwave admittance which is needed for the design problems of attenuators.
山梨大学の論文
1961-12-20

著者

石田哲朗
山梨大学工学部

導波管減衰器用抵抗板

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