A Novel Method of Conductivity Measurements for Carbon-Fiber Monopole Antenna

Author

Galehdar, Amir ; Callus, Paul J. ; Ghorbani, Kamran

Author_Institution

Sch. of Electr. & Comput. Eng., RMIT Univ., Melbourne, VIC, Australia

Volume

59

Issue

6

fYear

2011

fDate

6/1/2011 12:00:00 AM

Firstpage

2120

Lastpage

2126

Abstract

The relation between loss resistance and conductivity for monopole antennas over a ground plane is derived. Its accuracy was confirmed by good agreement between it and finite element and method of moments simulations. This relation may be used to calculate conductivity of any material that radiates. A Wheeler Cap system was setup. System losses were determined by equating the loss resistance of a 70 mm long × 1.17 mm diameter copper monopole at resonance with that predicted using the published conductivity for this material. The loss resistance of a 70 mm long × 2 mm wide × 2 mm thick monopole antenna manufactured from an aerospace grade carbon fibre reinforced plastic (CFRP) laminate, IM7/977-3 prepreg tape with a [0 45 90-45]_2s stacking sequence, was measured then corrected for system loss. The conductivity of the CFRP laminate was calculated to be 51,000 S/m at 980 MHz.

Keywords

carbon; composite materials; finite element analysis; microstrip antennas; monopole antennas; C; CFRP; aerospace grade carbon fibre reinforced plastic; carbon-fiber monopole antenna; conductivity measurement; copper monopole antenna; finite element method; frequency 980 MHz; moment simulation method; wheeler cap system; Antenna measurements; Conductivity; Electrical resistance measurement; Loss measurement; Mathematical model; Resistance; Resonant frequency; Advanced composite materials (ACM); carbon fibre reinforced plastic (CFRP); conductivity; loss resistance; monopole antenna;

fLanguage

English

Journal_Title

Antennas and Propagation, IEEE Transactions on

Publisher

ieee

ISSN

0018-926X

Type

jour

DOI

10.1109/TAP.2011.2143676

Filename

5751644