Miniature tri‐wideband Sierpinski–Minkowski fractals metamaterial perfect absorber

Abstract

With rapidly growing adoption of wireless technologies, requirements for the design of a miniature wideband multi‐resonators are increasing. In this study, a compact fractal‐based metamaterial structure with lumped resistors is described. The structure of the authors proposed absorber is a combination of Sierpinski curve and Minkowski fractal. The new combination provides larger capacitance and inductance in the system enabling perfect absorption at lower frequencies. The final structure with dimensions of 20 × 20 × 1.6 mm3 and an air gap of 12.5 mm provides three main resonances at frequencies of 2.1, 5.1, and 12.8 GHz with bandwidth (absorption ratio over 90%) of 840 MHz, 1.05 GHz, and 910 MHz, respectively.

Fractal Antennas: An Historical Perspective

“…when combined with fractal geometry results in various antenna property improvements such as size miniaturization, multiband operation, isolation enhancement between the antenna elements, etc. Literature reports numerous metamaterial-based fractal antennas to achieve the aforementioned enhancement in the antenna design [95][96][97][98]. In [95], authors employ the combined technique of metamaterial and fractal geometry to achieve antenna miniaturization and multiband operation.…”

“…A combination of chiral metamaterial with dendrite fractal geometry is employed in [97] to achieve miniaturization in overall antenna design. In [98] a compact fractal-based metamaterial antenna is utilized to achieve miniaturization and tri-wideband phenomenon. Additionally, the proposed Sierpiński-Minkowski fractal combination loaded with metamaterial resulted this structure as perfect absorber at lower frequency.…”

Wide-angle metamaterial absorber with highly insensitive absorption for TE and TM modes

“…In 36 , 37 , lumped resistors have been added to MPA structure in energy harvesting applications to avoid wasting trapped signals in lossy substrates and convert them to usable energy. It is noteworthy that adding lumped resistors increases absorption efficiency as well as bandwidth 16 . In 38 , four wheels resonator without lumped resistors shows multi absorption bands characteristics.…”

An approach for circuit modeling of a multiband resonators based planar metamaterial absorber

“…[8][9][10] However, the difficulty arises in modeling the composite geometries. Some research works [11][12][13][14][15] attempted circuit models for complex geometries and are compared with the proposed work in Table 1.…”