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J Electromagn Eng Sci > Volume 14(3); 2014 > Article
Journal of Electromagnetic Engineering and Science 2014;14(3):293-298.
DOI: https://doi.org/10.5515/JKIEES.2014.14.3.293   
Conductivity Evaluation of a Newly Proposed Material for a SAR Reflector Antenna
Seong Sik Yoon1, Jae Wook Lee1, Taek Kyung Lee1, Jin Ho Roh2, Hark Inn Kim2, Dong Woo Yi3
1Department of Electronics, Telecommunication and Computer Engineering, Korea Aerospace University
2Department of Mechanical Engineering, Korea Aerospace University
3Agency for Defense Development
Abstract
Large spaceborne antennas should be lightweight, a factor related to the development costs of launch vehicles. In order to overcome this drawback, a feasibility study of a new carbon fiber reinforced polymer (CFRP) named M55J/RS3 is carried out for a synthetic aperture radar (SAR) reflector antenna. In particular, the high resolution of detected images is taken into consideration. To validate the electrical performance, a test of the CFRP specimen is fabricated, and the transmission/reflection coefficients are measured using a standard X-band waveguide. Finally, the effective complex permittivity and effective electrical conductivity are derived from the obtained measured data. By applying the derived conductivity to the simulation of the radiation pattern, antenna gain, and beamwidth-instead of relying on the assumption of a perfect electric conductor-variations in electrical performance are also investigated and discussed.
Key words: CFRP, Complex Permittivity, Electric Conductivity, Gain Loss, Reflector Antenna
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