Broad bandwidth of thin composite radar absorbing structures embedded with frequency selective surfaces |
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| Affiliation: | 1. Department of Aerospace Engineering, KAIST, 373-1 Guseong-dong, Yuseong-gu, Daejeon 305-701, Republic of Korea;2. Composite Materials Laboratory, Korea Institute of Materials Science (KIMS), Changwon, Gyeongnam 642-831, Republic of Korea;3. Agency for Defense Development (ADD), Daejeon 305-152, Republic of Korea;1. Department of Aerospace Engineering, KAIST, 373-1 Guseong-dong, Yuseong-gu, Daejeon 305-701, Republic of Korea;2. Composite Materials Laboratory, Korea Institute of Materials Science (KIMS), Changwon, Gyeongnam 642-831, Republic of Korea;3. Agency for Defense Development (ADD), Daejeon 305-152, Republic of Korea;1. Department of Aerospace Engineering, KAIST, 373-1 Guseong-dong, Yuseong-gu, Daejeon 305-701, Republic of Korea;2. Agency for Defense Development (ADD), Daejeon 305-152, Republic of Korea;1. Division of Aerospace Eng., Department of Mechanical Eng., Korea Advanced Institute of Science and Technology (KAIST), 371-1, Gusong-dong, Yusong-Gu, Daejon, 305-701, South Korea;2. Gamma Nu Inc., 185-44, DontanMyun, Hwaseong, Kyonggi-Do, South Korea |
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| Abstract: | The three-layer ultrathin radar absorbing structure (RAS) involving a frequency selective surface (FSS) exhibiting excellent broad bandwidth properties is designed and fabricated. The EW and flaky carbonyl iron powders were used to produce two kinds of silicone rubber matrix magnetic composites for the top and the bottom layer, respectively. The electromagnetic parameters of the composites were measured in the frequency range of 2–18 GHz. The middle layer is an FSS in the form of double-square loops with four micro-split gaps in the middle of the outer loop. The results show that the proposed RAS can provide a 10 dB absorbing bandwidth of 13.2 GHz from 4.8 to 18 GHz (1.7 mm thickness) and a 10 dB absorbing bandwidth of 14.1 GHz from 3.9 to 18 GHz, covering C-band, X-band and Ku-band (2.0 mm thickness). A good match between simulation and measurement results demonstrates the validity of our design. |
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| Keywords: | Functional composites A Polymer-matrix composites A Sandwich structures B Magnetic properties |
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