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International Journal of Antennas and Propagation
Volume 2017, Article ID 6152651, 11 pages
Research Article

Carbon Fiber Reinforced Polymer with Shredded Fibers: Quasi-Isotropic Material Properties and Antenna Performance

1The Christian Doppler Laboratory for Wireless Technologies for Sustainable Mobility, Vienna, Austria
2Institute of Telecommunications, Technische Universität Wien, Vienna, Austria
3The Institute of Sensor and Actuator Systems, Technische Universität Wien, Wien, Austria

Correspondence should be addressed to Gerald Artner;

Received 19 January 2017; Revised 6 April 2017; Accepted 20 April 2017; Published 29 May 2017

Academic Editor: Mirko Barbuto

Copyright © 2017 Gerald Artner et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


A carbon fiber reinforced polymer (CFRP) laminate, with the top layer consisting of shredded fibers, is proposed and manufactured. The shredded fibers are aligned randomly on the surface to achieve a more isotropic conductivity, as is desired in antenna applications. Moreover, fiber shreds can be recycled from carbon fiber composites. Conductivity, permittivity, and permeability are obtained with the Nicolson-Ross-Weir method from material samples measured inside rectangular waveguides in the frequency range of 4 to 6 GHz. The decrease in material anisotropy results in negligible influence on antennas. This is shown by measuring the proposed CFRP as ground plane material for both a narrowband wire monopole antenna for 5.9 GHz and an ultrawideband conical monopole antenna for 1–10 GHz. For comparison, all measurements are repeated with a twill-weave CFRP.