An Ultrathin, Triple-Band Metamaterial Absorber with Wide-Incident-Angle Stability for Conformal Applications at X and K
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NANO EXPRESS
An Ultrathin, Triple‑Band Metamaterial Absorber with Wide‑Incident‑Angle Stability for Conformal Applications at X and Ku Frequency Band Guangsheng Deng1 , Kun Lv1, Hanxiao Sun1, Jun Yang1*, Zhiping Yin1, Ying Li1, Baihong Chi2 and Xiangxiang Li3
Abstract An ultrathin and flexible metamaterial absorber (MA) with triple absorption peaks is presented in this paper. The proposed absorber has been designed in such a way that three absorption peaks are located at 8.5, 13.5, and 17 GHz (X and Ku bands) with absorption of 99.9%, 99.5%, and 99.9%, respectively. The proposed structure is only 0.4 mm thick, which is approximately 1/88, 1/55, and 1/44 for the respective free space wavelengths of absorption frequency in various bands. The MA is also insensitive due to its symmetric geometry. In addition, the proposed structure exhibits minimum 86% absorption (TE incidence) within 60° angle of incidence. For TM incidence, the proposed absorber exhibits more than 99% absorptivity up to 60° incidence. Surface current and electric field distributions were investigated to analyze the mechanism governing absorption. Parameter analyses were performed for absorption optimization. Moreover, the performance of the MA was experimentally demonstrated in free space on a sample under test with 20 × 30 unit cells fabricated on a flexible dielectric. Under normal incidence, the fabricated MA exhibits near perfect absorption at each absorption peak for all polarization angles, and the experimental results were found to be consistent with simulation results. Due to its advantages of high-efficiency absorption over a broad range of incidence angles, the proposed absorber can be used in energy harvesting and electromagnetic shielding. Keywords: Metamaterial, Absorber, Conformal, Ultrathin, Multi-band Introduction In recent years, metamaterials have received widespread concern due to their exotic properties, such as negative refractive index [1], perfect imaging [2], and inverse Doppler effects [3]. Because of these properties, metamaterials have been proposed for use in various devices, such as electromagnetic (EM) cloaking [4], ultra-sensitive sensing [5], filters [6, 7], and absorbers [8–12]. In particular, metamaterial absorbers (MAs), compared with *Correspondence: [email protected] 1 Special Display and Imaging Technology Innovation Center of Anhui Province, Academy of Opto‑Electronic Technology, Hefei University of Technology, Hefei 230009, China Full list of author information is available at the end of the article
traditional microwave absorbers, are used in a variety of fields, ranging from military to consumer electronics. MAs tend to be lightweight and thin. In 2008, a perfect MA was first presented by Landy et al. [13]. Subsequently, different types of MAs, such as single-band [14, 15], dual-band [16–21], multi-band [22–27], and wideband absorbers [28–36], have been presented by various researchers. Among these MAs, multi-band MAs enable perfect absorption at several discrete frequencies, enabling appl
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