Simple Design of a Wideband and Wide-Angle Insensitive Metamaterial Absorber Using Lumped Resistors for X- and Ku-Bands

Abstract

We report a wideband and polarization-/wide-angle insensitive metamaterial absorber based on a symmetry structure associated with surface mount resistors. The proposed structure consists of a periodic array of a top metal symmetry resonator loading with four lumped resistors and a continuous metal ground plane separated by a dielectric substrate of FR-4. A prototype of the proposed absorber is fabricated and measured, confirming a good agreement between the measurement and simulation results. The proposed absorber shows polarization-insensitive behavior and the absorption response in a frequency range from 8-18 GHz covering the entire X-and Ku-bands with an absorptivity above 80% for a wide incident angle up to 40 o for both transverse electric and transverse magnetic polarizations. Compared with the reported broadband absorbers using lumped resistors, our proposed absorber exhibits excellent characteristics in terms of compact and simple structure, high relative absorption bandwidth, and polarization and wide-incident insensitivity. Therefore, this design shows promising potential for both X-and Ku-band applications.

Novel Local-Chiral Metamaterial: Effective Modulation of Amplitude & Phase for Wideband Polarization-Insensitive Absorption

“…Currently, there are various design tools or methods available to achieve wideband absorption performance in different EM wave bands, such as transformation optics, , using chaos, , complementary metamaterial structures, , space-filling techniques, and resonator material tailoring. − Especially for the GHz band, wideband absorption design is of great significance in improving the performance of electronic equipment and developing military stealth technology. In general, there are three available methods for designing wideband absorption in microwave band based on structural design: horizontal arrangement, − vertical arrangement, ,− and loading lumped elements. − By utilizing the principle of mutual superimposition of different resonant frequencies, the absorption bandwidth can effectively be broadened by multiple resonant points generated from the horizontally tiling or vertically stacking of different MMA structure patterns. Among them, one novel design method for the broadband absorbers design is the selective absorption of EM waves with different polarization modes which can be achieved by constructing chirality in metamaterial units, , and this design method has gradually been applied to the design of broadband absorbers in recent years. , However, the high Q-factor of the low-resistance metallic materials utilized in the resonant unit of these designs makes it difficult to further widen the absorption bandwidth.…”

“…Among them, one novel design method for the broadband absorbers design is the selective absorption of EM waves with different polarization modes which can be achieved by constructing chirality in metamaterial units, , and this design method has gradually been applied to the design of broadband absorbers in recent years. , However, the high Q-factor of the low-resistance metallic materials utilized in the resonant unit of these designs makes it difficult to further widen the absorption bandwidth. Therefore, researchers have proposed two alternative methods: replacing resonant units with lossy resistive films or loading lumped resistors ,− at appropriate positions in resonant units.…”

A polarization‐insensitive metamaterial absorber for moisture‐sensing applications of agriculture products

“…The shape, size, and layout of unit cells play a crucial role in determining the metamaterial's performance. Moreover, natural materials are characterized by their dielectric properties, and their engineering techniques have led to the creation of novel products 2 . The integration of metamaterials with natural materials offers the potential for developing innovative solutions for various applications.…”

A Simple Design of Water-based Broadband Metamaterial Absorber for THz Applications

“…However, designing the broadband absorber remains a challenging issue, especially in the THz region [12]. Therefore, many different methods have proposed to broaden the bandwidth of absorbers, such as using multi-resonators in a unit cell [4], vertical stacking metal-dielectric multi-layers [13,14], and lumped elements [15,16] or using graphene [17][18][19], or vanadium dioxide [20][21][22], and MoS 2 [23].…”

“…However, the mentioned designs are complex in fabrication [4,[13][14][15][16] or need to be controlled by outside elements such as temperature and voltage [17][18][19][20][21][22][23]. Recently, metamaterials with high dielectric loss have been demonstrated as a potential method to extend the absorption bandwidth [24][25][26][27][28][29][30][31][32][33].…”