Measurement of electrical conductivity in carbon/epoxy composite material over the frequency range 75 MHz to 2.0 GHz
Abstract
A stripline technique for the measurement of longitudinal and transverse conductivity of graphite (carbon)/epoxy composite materials over the VHF/UHF (75 MHz to 2.0 GHz) range is described. The method is unusual in that it is essentially free of the uncertain effects of contact resistance between the sample and the measurement apparatus. The underlying theory of the method rests on the relationship between the conductivity of the sample and the lossy standing wave patterns established on the strip transmission line. The method accommodates a range of sample conductivities from 100 mhos/m. (e.g. transverse carbon/epoxy) to aluminum (approx. 10 to the 7th power mhos/m). Actual measurements were made from 75 MHz to 2 GHz. The method itself should be usable from 50 MHz to 4 GHz.
- Publication:
-
Phase Report
- Pub Date:
- October 1979
- Bibcode:
- 1979syra.rept.....W
- Keywords:
-
- Carbon;
- Composite Materials;
- Electrical Measurement;
- Electrical Resistivity;
- Epoxy Resins;
- Boron-Epoxy Composites;
- Frequencies;
- Graphite;
- Standing Waves;
- Transmission Lines;
- Electronics and Electrical Engineering