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Low Dielectric Loss PTFE/CeO2 Ceramic Composites for Microwave Substrate Applications

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Cerium oxide (CeO2) filled polytetrafluoroethylene (PTFE) composites prepared by powder processing technique for microwave substrate application is presented in this paper. The PTFE is used as the matrix and the dispersion of CeO2 in the composite is varied up to 0.6 by volume fraction, and the dielectric properties were studied at 1 MHz and microwave frequencies. The relative permittivity and dielectric loss increased with increase in CeO2 content. For 0.6 volume fraction loading of the ceramic, the composite has r of 5 and tan  of 0.0064 at 7 GHz. Different theoretical approaches have been employed to predict the effective permittivity of composite systems and the results were compared with that of experimental data. The serial mixing model shows good correlation with the experimental results.

Document Type: Research Article

DOI: http://dx.doi.org/10.1111/j.1744-7402.2008.02228.x

Affiliations: 1: Materials and Minerals Division, National Institute for Interdisciplinary Science and Technology (Formerly Regional Research Laboratory), Thiruvananthapuram 695019, India 2: Department of Electronics, Cochin University of Science and Technology, Cochin 682022, India

Publication date: July 1, 2008

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