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Effect of Particle Size on the Microwave Dielectric Properties of Alumina‐Filled PTFE Substrates
Author(s) -
Murali Kodakkattu P.,
Rajesh Surendran,
Nijesh Kunnamkuzhakal J.,
Ratheesh Ravendran
Publication year - 2010
Publication title -
international journal of applied ceramic technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.4
H-Index - 57
eISSN - 1744-7402
pISSN - 1546-542X
DOI - 10.1111/j.1744-7402.2009.02483.x
Subject(s) - materials science , dielectric , microwave , particle size , composite material , particle (ecology) , engineering physics , nanotechnology , chemical engineering , optoelectronics , quantum mechanics , oceanography , physics , engineering , geology
α‐alumina of different particle sizes of 50 nm, 0.4, 3, and 7 μm have been incorporated into the PTFE matrix to prepare flexible composite substrates. A proprietary process comprising of sigma mixing, extrusion, and calendering, followed by hot pressing (SMECH process) has been used to obtain dimensionally stable ceramic‐filled PTFE substrates. Variation of the dielectric constant, loss tangent and moisture absorption of filled PTFE composites has been ascertained as a result of filler loading.