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http://dx.doi.org/10.5139/IJASS.2017.18.2.215

A Study on a Radar Absorbing Structure for Aircraft Leading Edge Application  

Baek, Sang Min (Aeronautical Technology Directorate, Agency for Defense Development)
Lee, Won Jun (Aeronautical Technology Directorate, Agency for Defense Development)
Joo, Young Sik (Aeronautical Technology Directorate, Agency for Defense Development)
Publication Information
International Journal of Aeronautical and Space Sciences / v.18, no.2, 2017 , pp. 215-221 More about this Journal
Abstract
An electromagnetic (EM) wave absorber reduces the possibility of radar detection by minimizing the radar cross section (RCS) of structures. In this study, a radar absorbing structure (RAS) was applied to the leading edge of a blended wing body aircraft to reduce RCS in X-band (8.2~12.4GHz) radar. The RAS was composed of a periodic pattern resistive sheet with conductive lossy material and glass-fiber/epoxy composite as a spacer. The applied RAS is a multifunctional composite structure which has both electromagnetic (EM) wave absorbing ability and load-bearing ability. A two dimensional unit absorber was designed first in a flat-plate shape, and then the fabricated leading edge structure incorporating the above RAS was investigated, using simulated and free-space measured reflection loss data from the flat-plate absorber. The leading edge was implemented on the aircraft, and its RCS was measured with respect to various azimuth angles in both polarizations (VV and HH). The RCS reduction effect of the RAS was evaluated in comparison with a leading edge of carbon fabric reinforced plastics (CFRP). The designed leading edge structure was examined through static structural analysis for various aircraft load cases to check structural integrity in terms of margin of safety. The mechanical and structural characteristics of CFRP, RAS and CFRP with RAM structures were also discussed in terms of their weight.
Keywords
Radar absorbing structure (RAS); Reflection loss; Radar cross section (RCS); Composites;
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1 Pinho, M. S., Gregori, M. L., Nunes, R. C. R. and Soares, B. G., "Perfomance of Radar Absorbing Materials by Waveguide Measurements for X-and Ku-band Frequencies", European Polymer Journal, Vol. 38, No. 11, 2002, pp. 2321-2327.   DOI
2 Gibson, R. F., "A Review of Recent Research on Mechanics of Multifunctional Composite Materials and Structures", Composite Structure, Vol. 92, No. 12, 2010, pp. 2793-2810.   DOI
3 Fante, R. L. and Mccormack, M. T., "Reflection Properties of the Salisbury Screen", IEEE Transcations on Antennas and Propagation, Vol. 36, No. 10, 1988, pp. 1443-1454.   DOI
4 Lee, W. J., Design of Electromagnetic Wave Absorbing Composite Structures using Planar Periodic Pattern, doctoral thesis, 2008.
5 Choi, W. H., Kim, J. B., Shin, J. H., Song, T. H., Lee, W. J., Joo, Y. S. and Kim, C. G., "Circuit-Analog (CA) Type of Radar Absorbing Composite Leading-edge for Wing-shaped Structure in X-band: Practical Approach from Design to Fabrication", Composites Science and Technology, Vol. 105, 2014, pp. 96-101.   DOI
6 Tretyakov, S. A. and Simovski, C. R., "Dynamic Model of Artificial Reactive Impedance Surfaces", Journal of Electromagnetic Waves and Applications, Vol. 17, No. 1, 2003, pp. 131-145.   DOI
7 Munk, B. A., Frequency Selective Surfaces: Theory and Design, A Wiley-Interscience Publication, 2000.
8 Ghodgaonkar, D. K., Varadan, V. V. and Varadan, V. K., "A Free-Space Method for Measurement of Dielectric Constants and Loss Tangents at Microwave Frequencies", IEEE Transactions on Instrumentation and Measurement, Vol. 37, No. 3, 1989, pp.789-793.
9 Folgueras, L. D. C., Alves, M. A. and Rezende, M. C., "Microwave Absorbing Paints and Sheets based on Carbonyl Iron and Polyaniline: Measurement and Simulation of their Properties", Journal of Aerospace Technology and Management, Vol. 2, No. 1, 2010, pp. 63-70. DOI 10.5028/jatm. 2010.02016370   DOI
10 de Castro Dias, J., Martin, I. M. and Rezende, M. C., "Reflectivity of Hybrid Microwave Absorbers based on NiZn Ferrite and Carbon Black", Journal of Aerospace Technology and Management, Vol. 4, No. 3, 2012, pp. 267-274 DOI 10.5028/jatm. 2012.04032512.   DOI
11 Choi, I., Kim, J. G. and Seo, I. S., "Radar Absorbing Sandwich Construction Composed of CNT, PMI Foam and Carbon/epoxy Composite", Composite Structure, Vol. 94, No. 9, 2012, pp. 3002-3008.   DOI
12 Knott, E. F., Shaeffer, J. F. and Tuley, M. T., Radar Cross Section: its Prediction, Measurement and Reduction, Artech House, 1985.
13 Lee, W. J., Lee, J. W. and Kim, C. G., "Characteristics of an Electromagnetic Wave Absorbing Composite Structure with a Conducting Polymer Electromagnetic Bandgap (EBG) in the X-band", Composites Science and Technology, Vol. 68, No. 12, 2008, pp. 2485-2489.   DOI
14 Kim, P. C. and Lee, D. G., "Composite Sandwich Constructions for Absorbing the Electromagnetic Waves", Composite Structure, Vol. 87, No. 2, 2009, pp. 161-167.   DOI
15 Vinoy, K. J, and Jha, R. M., Radar Absorbing Materials from Theory to Design and Characterization, Boston: Kluwer Academic Publishers, 1996.