Open-circuit coaxial transmission-line sample holders were used to determine the electromagnetic dielectric properties of five soil textural types as functions of moisture level content and frequency. A brief outline of the theoretical basis is given for the open-circuit method along with the measurement system and the sample preparation. Experimental results are given for the different soil textural types for moisture levels ranging from 0 to 48 percent and for test frequencies ranging from 300 to 9300 MHz.
This report is the result of an extensive literature search conducted in the field of connectors and cables, and of the problem dealing with radio frequency leakage characteristics and the ability to measure the shielding effectiveness of these connectors and cables.It reviews two measurement techniques for determining the shielding effectiveness: the triaxial test technique that has been used for over 20 years and the modestirred test technique that recently has started to gain in popularity. From this survey, certain inferences are drawn about these techniques in terms of device configuration, frequency range, and ease of measurement and are presented in chart form for comparative purposes.
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