Design of a Material Test Kit for Use from 1.6 GHz to 26.5 GHz and its Use in Evaluation of Dielectric Properties of Foam Core Materials Used in Sandwich Composites.

摘要

In the present world, the usage of composite materials has been considerably increased in various fields. The composites have found a wide variety of applications in the field of electrical engineering and electronics such as insulators, electromagnetic interference (EMI) shielding materials etc. So, the research in the measurement of electromagnetic properties i.e. dielectric properties of these materials has been conducted. In this presentation, the dielectric properties of various RohacellRTM composite foams will be shown. These foams are widely used in the field of antenna design, Magnetic Resonance Imaging (MRI) and the aerospace industry. These composite materials are measured using an Agilent N5242-X vector network analyzer (VNA) in various bands such as R-band, S-band, C-band, G-band, C-band, X-band, P-band and K-band i.e. the dielectric properties of these materials are measured in the frequency range of 1.70 GHz to 26.5 GHz. The rectangular waveguide (RWG) is used for the measurement. Calibration kits have been designed for these waveguides. We have used the Agilent 85071E material measurement software to find the permittivity in terms of the measured S-parameters. A complete view about the design of calibration kits and calibration of VNA will also be discussed in this report.