Polarization insensitive symmetrical structured double negative (DNG) metamaterial absorber for Ku-band sensing applications

Abstract

Metamaterial absorber (MMA) is now attracting significant interest due to its attractive applications, such as thermal detection, sound absorption, detection for explosive, military radar, wavelength detector, underwater sound absorption, and various sensor applications that are the vital part of the internet of things. This article proposes a modified square split ring resonator MMA for Ku-band sensing application, where the metamaterial structure is designed on FR-4 substrate material with a dielectric constant of 4.3 and loss tangent of 0.025. Perfect absorption is realized at 14.62 GHz and 16.30 GHz frequency bands, where peak absorption is about 99.99% for both frequency bands. The proposed structure shows 70% of the average absorption bandwidth of 420 MHz (14.42–14.84 GHz) and 480 MHz (16.06–16.54 GHz). The metamaterial property of the proposed structure is investigated for transverse electromagnetic mode (TEM) and achieved negative permittivity, permeability, and refractive index property for each absorption frequency band at 0°, 45°, and 90° polarization angles. Interference theory is also investigated to verify the absorption properties. Moreover, the permittivity sensor application is investigated to verify the sensor performance of the proposed structure. Finally, a comparison with recent works is performed, which shows that the proposed MMA can be a good candidate for Ku-band perfect absorber and sensing applications.

Wide-Oblique-Incident-Angle Stable Polarization-Insensitive Ultra-Wideband Metamaterial Perfect Absorber for Visible Optical Wavelength Applications

“…Absorption characteristics can also be calculated by applying the Interference Theory (IT) model, which also explains the underlying physics of the metamaterial absorber [ 33 , 34 ]. The patch (layer 1) with a particular metallic pattern acts as a partial reflection surface.…”

Polarization Independent Metamaterial Absorber with Anti-Reflection Coating Nanoarchitectonics for Visible and Infrared Window Applications

“…The blocking capability of EM waves can be understood by skin depth , where wavelength is proportional to skin depth. So, a higher skin depth is required to block the larger wavelength [ 17 , 51 ]. Figure 7 shows the investigation of absorption property for different back layer thicknesses from h1 = 105 to 65, where the absorption is reduced in the near-infrared region with the decrease of the thickness h1.…”

“…Moreover, atmospheric phenomena not related to radiation from space represent another subject of intensive research. Camouflage technology [ 10 ], invisible cloaks [ 11 ], antennas [ 12 , 13 ], super lenses [ 14 ], sensors [ 15 , 16 , 17 , 18 , 19 ], filters [ 20 ] and physical property detection [ 21 ] are some non-atmospheric applications. With the rapid improvement of simulation software and new measuring tools, real breakthroughs are being discovered every moment by researchers.…”

Quad-Band Polarization-Insensitive Square Split-Ring Resonator (SSRR) with an Inner Jerusalem Cross Metamaterial Absorber for Ku- and K-Band Sensing Applications

“…The proposed MMA was designed and simulated using the CST microwave studio [50], where the unit cell boundary conditions were applied along the Y-and X-axes, and electromagnetic waves were applied along the negative Z-axis. The absorption behavior A(ω) was determined according to Equation (1) [27].…”

“…In MMAs, near-unity absorption peaks are achieved by controlling the imaginary and real part of complex dielectric, magnetic permeability and electrical permittivity. The input impedance of MMAs matches with free space impedance, which is achieved through specific geometrical design of the top metal (resonator) [27]. Impedance matching between air and the MMA reduces the reflected power at a particular frequency, and the bottom metal blocks EM wave transmission through the MMA [28].…”