Miniaturization for ultrathin metamaterial perfect absorber in the VHF band

Abstract

An efficient resolution for ultrathin metamaterial perfect absorber (MPA) is proposed and demonstrated in the VHF radio band (30–300 MHz). By adjusting the lumped capacitors and the through vertical interconnects, the absorber is miniaturized to be only λ/816 and λ/84 for its thickness and periodicity with respect to the operating wavelength (at 102 MHz), respectively. The detailed simulation and calculation show that the MPA can maintain an absorption rate over 90% in a certain range of incident angle and with a wide variation of capacitance. Additionally, we utilized the advantages of the initial single-band structure to realize a nearly perfect dual-band absorber in the same range. The results were confirmed by both simulation and experiment at oblique incidence angles up to 50°. Our work is expected to contribute to the actualization of future metamaterial-based devices working at radio frequency.

Low‐cost and miniaturized metamaterial absorber using 3D printed swastika symbol

“…For a low‐frequency MM absorber, the unit cell size is an important factor because of a periodic configuration of a MM. Therefore, various unit cell geometry for miniaturization has been proposed in a low frequency . For instance, a snake‐shape unit cell is proposed to design MM absorbers at 2 GHz and 400 MHz .…”

“…A planar sandwiched metal‐dielectric‐metal unit cell is proposed to minimize the MM unit cell size at 400 MHz . The unit cell size of the MM absorber is reduced by loading lumped capacitors and vertical interconnects at 102 MHz . The MM unit cell is miniaturized by a metallic ring on the top layer and meander line on the bottom layer in a multilayer …”

“…Therefore, various unit cell geometry for miniaturization has been proposed in a low frequency. [19][20][21][22][23] For instance, a snake-shape unit cell is proposed to design MM absorbers at 2 GHz and 400 MHz. 19 A needlepoint-shape MM unit cell is designed using a magnetic material at 400 MHz.…”

Experimental analysis and comparison between cross‐shaped metamaterial absorber and its complementary structure

“…Including semiconductors, phase change media, graphene, carbon nanotubes, liquid crystals, and some other optoelectronic materials, have been explored to apply in metamaterials to realize muti‐functionalities. Since the first MMA tested by Landy et al at 11.5 GHz with 88% absorption, a lot of references have been reported with perfect absorption by introducing varied metallic resonators on the top layer, such as rectangular patch resonator, octagonal ring, split ring resonator, dendritic resonator, circular aperture with vertical interconnects, inverted Minkowski fractal loop, chiral helical particles and so on. Among these variations, complementary structures have been taken seriously in metamaterials modeling because of its underlying broadband frequency resonance .…”

Controlled Defect Based Ultra Broadband Full-sized Metamaterial Absorber

“…in 2008 10 . Since then, various MPAs structures have been extensively investigated 11–16 with numerous methods, operating in different frequency regions, ranging from MHz to the visible 7,12,14–20 . Such electronic materials are garnering more and more attraction.…”