Flexible Metamaterial-Based Frequency Selective Surface with Square and Circular Split Ring Resonators Combinations for X-Band Applications

Abstract

To meet the demand for modern communication technology, the development of satellite communications has been consistently investigated. In this article, a rectangle-type SRR is attached to circular-type SRR for obtaining two frequencies in X-band operation. The designed structure exhibits negative metamaterial properties (Epsilon, mu and refractive index are negative) and the design was fabricated on a polyimide dielectric material with a 10 × 10 mm2 size. The polyimide dielectric material is chosen with a thickness of 0.1 mm and a dielectric constant of 0.0027. The proposed unit cell is designed and simulated by using one of the numerical simulation tools, CSTMW studio, in which the frequency limit is chosen from 7 to 12 GHz. From the results, we can observe that the proposed design resonates at two X-band frequencies at 9.84 GHz and 11.46 GHz and the measurement results of the proposed design resonate at 9.81 GHz and 11.61 GHz. It is worth noting that the simulation and measurement findings both obtain the same X-band frequencies, with only a minor difference in the frequency values. Thus, the recommended design is very much useful for X-band applications.

SRR inspired inversion symmetry-shaped left-handed metamaterial with a high effective medium ratio for ASR and WLAN applications

“…On the other hand, metamaterials are used in various fields due to their advantages. Their uses include absorbers [ [6] , [7] , [8] ], substrates [ 9 ], reconfigurable antennas [ 10 ], microwave application devices like Wi-Fi, GPS [ 11 , 12 ], imaging [ 13 , 14 ], reduction of specific absorption rate (SAR) [ 15 ], radar cross-section (RCS) [ 16 ], cloaking [ 17 ], metamaterial sensors [ 18 , 19 ], filters [ 20 ], lenses [ [21] , [22] , [23] ], perfect tunnelling [ 24 ], optics [ 25 ], microwave communications radar and satellite [ [26] , [27] , [28] ], coding and information metamaterial [ 29 , 30 ], fractal structured metamaterial [ 31 , 32 ], and terahertz metamaterial [ 33 , 34 ]. Many applications require the design of systems that achieve superior functioning, device compactness, and enhanced data measurement capacity.…”

Conformal ultra‐miniaturized frequency selective surface for medical shielding applications

“…To provide a solution, a two‐dimensional structure without vias made of triangular metallic patches with meandering lines on the top and bottom layer is proposed by Zhou et al 13 In addition, two substrate layers with three conductive layers and one substrate layer with two conductive layers are stacked for ultra‐miniaturizing the FSS unit cell in Ashvanth et al 14 and Ma et al 15 More number of lossy substrates in multilayer structures not only provides a higher profile, it also produces a sensitive response due to the strong electric field confined between them. To avoid the bulkier structure that causes discomfort for wearable applications, the authors focused on the single‐layer 2D filter system 16–29 . Chen et al proposed the fractal geometry 26 made up of modified Sierpinski octagon patches to exhibit the dual stop‐band characteristics.…”

“…Even though the existing art focuses on conformal nature, it fails to provide an ultra‐miniaturized profile 18,19 . The tradeoff between the conformal and miniaturized shield is present in the art 21–23 …”

Ultra-wideband and wide-angle RCS reduction of a concave structure based on a chessboard polarization conversion metasurfaces

“…Thus, it is essential to achieve the RCS reduction of the curved surface structure in order to considerably reduce the aircraft's backward electromagnetic scattering and improve the target's combat survivability. The majority of the studies on RCS reduction of curved structures [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18] that are currently available focus on convex structures [4][5][6][7][8][9][10][11][12][13][14][15], while concave structures [16][17][18] have received limited attention in previous studies. Ishii et al using a concave metasurface absorber, achieved a −10 dB RCS reduction at 9.88 GHz under normal incident [16].…”