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- W2030897296 abstract "A re-entrant cylindrical cavity has been adapted to measure the dielectric constant and power factor of small disk samples of insulating materials. The methods of measurement, mechanical details, and electric coupling and detecting circuits all are described. A single cavity can be utilized only over a frequency range of about 1.5 ratio from lowest to highest frequency. Therefore, several different-sized cavities would be required to cover a range of frequency from 50 to 1,000 megacycles. An accuracy of ±0.00005 in tan δ and ± 1 per cent in dielectric constant may be obtained in routine measurements. Because the cavity has a very high Q(>2,000), it is much more sensitive to low-power-factor dielectric samples than any conventional coil-and-capacitor resonant circuit. The chief advantages of this method are that the operation of the apparatus is simple, very rapid, and similar to the susceptance variation technique now used at lower radio frequencies. Also, the involved computations usually found in other methods operative in this frequency range are eliminated." @default.
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- W2030897296 date "1944-12-01" @default.
- W2030897296 modified "2023-09-27" @default.
- W2030897296 title "A Resonant-Cavity Method for Measuring Dielectric Properties at Ultrahigh Frequencies" @default.
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- W2030897296 doi "https://doi.org/10.1109/t-aiee.1944.5058852" @default.
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