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Analyzing Broadband Free-Field, Absorber Measurements



David R. Novotny, Robert T. Johnk, Arthur Ondrejka


We present and analyze a method for free-field evaluation of broadband absorber in a non-ideal testing environment. Using broadband, short-impulse TEM horns, a frequency-rich spectrum (equivalent pulse length < 0.5 ns) illuminates a sample of the material under test and the reflections are recorded. Unwanted reflections from the sample edges, room environment, antenna and other systematic events are mathematically removed by a combination of time gating, background subtraction and systematic de-convolution. The result is an estimate of the reflection characteristics of the center at the sample. We also present an uncertainty analysis of the measurement technique.
Proceedings Title
Proc., IEEE Intl. Electromagnetic Compatibility (EMC) Symposium
Conference Dates
August 13-17, 2001
Conference Location
Montreal, 1, CA


RF, compliance, absorber


Novotny, D. , Johnk, R. and Ondrejka, A. (2001), Analyzing Broadband Free-Field, Absorber Measurements, Proc., IEEE Intl. Electromagnetic Compatibility (EMC) Symposium, Montreal, 1, CA (Accessed May 22, 2024)


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Created July 31, 2001, Updated October 12, 2021