Complex permittivity of low loss thermoplastic composites using a resonant cavity method

Ku, Harry S. and Ball, James A. R. and Siores, Elias and Chan, Peter (1999) Complex permittivity of low loss thermoplastic composites using a resonant cavity method. In: 12th International Conference on Composite Materials (ICCM-12), 5-9 July 1999, Paris, France.


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The use of high energy rate joining of fibre-reinforced thermoplastic (FRTP) composites using microwaves has yielded promising preliminary results and more research is being carried out so that the technology can find its application in manufacturing industries shortly. Methods such as the dielectric probe and waveguide transmission have been successfully used to measure the dielectric constant (e') of low loss thermoplastic composites but they cannot give reliable results when used to measure the dielectric loss (e''). This paper describes a convenient laboratory based method designed to obtain e', e'' and hence loss tangent tan forlow loss thermoplastic composite materials like glass fibre reinforced (33%) low density polyethylene [LDPE/GF(33%)]. The method is called the resonant cavity method and the schematic diagram of the set up and that of the cavity is depicted in Fig.1 and Fig. 2 respectively.

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Item Type: Conference or Workshop Item (Commonwealth Reporting Category E) (Paper)
Refereed: Yes
Item Status: Live Archive
Additional Information: Author's version deposited with permission of publisher.
Faculty / Department / School: Historic - Faculty of Engineering and Surveying - Department of Mechanical and Mechatronic Engineering
Date Deposited: 06 Jun 2008 04:36
Last Modified: 10 Dec 2014 02:52
Uncontrolled Keywords: resonant cavity, perturbation, microwaves, Q factor, dielectric constant, dielectric loss and loss tangent
Fields of Research : 09 Engineering > 0912 Materials Engineering > 091202 Composite and Hybrid Materials

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