Abstract #302299

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JSM 2003 Abstract #302299
Activity Number: 164
Type: Topic Contributed
Date/Time: Monday, August 4, 2003 : 2:00 PM to 3:50 PM
Sponsor: Section on Physical and Engineering Sciences
Abstract - #302299
Title: Optimal Sampling of Microwave Resonance Curves
Author(s): Kevin J. Coakley*+ and Jolene Splett and Michael Janezic and Raian Kaiser
Companies: National Institute of Standards and Technology and National Institute of Standards and Technology and National Institute of Standards and Technology and National Institute of Standards and Technology
Address: 325 Broadway St., Boulder, CO, 80305-3337,
Keywords: dielectric materials ; experimental planning ; microwave resonance curve ; optimal estimation ; optimal sampling ; variance function modeling
Abstract:

As part of a project to characterize dielectric materials, we estimate the quality factor Q and resonant frequency fo of a microwave cavity based on observations of a frequency-dependent resonance curve. At each frequency, the resonance curve is the squared magnitude of a complex scattering parameter. In the measurement system, the number of sampled frequencies is fixed, but the frequency spacing is adjustable. Based on a parametric model for the variance function of the resonance curve, we estimate Q and fo and other associated model parameters using the method of weighted least squares. We determine the frequency spacings for optimal estimation of either Q or fo. We apply our methods to real data collected at NIST, and compare our estimation method to competing methods.

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