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- W1968571102 abstract "The helical resonator (HR) is a useful resonant structure for the measurement of the microwave conductivity and dielectric response, but must be calibrated to obtain absolute values of these quantities. This has been accomplished by the measurement of frequency shifts and Q changes of thin disk samples of the metals Cu, Al, and Au and high purity Si and the use of the formula for (f−f0)/f due to Bethe and Schwinger. The measurements were made at 293, 77, and 50 K for the HR modes n=1–7(124 MHz–1.44 GHz). The results demonstrate the largest uncertain in the calculated values of Δf/f result from the z-axis variation of the E and H fields because of the helix short leading to large uncertainties in the stored energy U. The large dielectric response of the metals with their large values of dielectric “constant” −(ωpτeff)2 larger than 104 allows neglect of the Ez component contribution to Δf/f. However, uncertainties in the value of the T-independent τeff in the skin depth regime require the absolute calibration with high purity Si with ε∼11.7 at T=77 K. The calibration is accurate to ±15%." @default.
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- W1968571102 date "2001-03-01" @default.
- W1968571102 modified "2023-09-24" @default.
- W1968571102 title "Calibration of a helical resonator for microwave dielectric and conductivity measurements of metals" @default.
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- W1968571102 doi "https://doi.org/10.1063/1.1347379" @default.
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