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An Accurate Method for Measuring the Dielectric Constant of Printed Wiring Board Materials



Nicholas G. Paulter Jr.


A new time-domain reflectometry measurement method is described that provides accurate measurements of the average high frequency (0.1 GHz to 10 GHz) dielectric constant of printed wiring board materials and that is suitable for factory floor use. A parallel plate transmission line is used for the sample geometry. Only simple numerical processes are required to extract the characteristic impedance and dielectric constant of the sample from the acquired data. The long term measurement reproducibility and short term measurement repeatability of the method are described.
Proceedings Title
IPC Printed Circuit Expo
Conference Dates
March 14-18, 1999
Conference Location
Long Beach, CA
Conference Title
IPC Printed Circuits Expo


dielectric constant, high speed/high frequency, measurement repeatability, printed wiring board, time-domain reflectometry


Paulter, N. (1999), An Accurate Method for Measuring the Dielectric Constant of Printed Wiring Board Materials, IPC Printed Circuit Expo, Long Beach, CA, [online], (Accessed May 28, 2024)


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Created March 1, 1999, Updated January 27, 2020