Abstract
The paper reveals the design of a unit cell of a metamaterial that shows more than 2 GHz wideband near zero refractive index (NZRI) property in the C-band region of microwave spectra. The two arms of the unit cell were splitted in such a way that forms a near-pi-shape structure on epoxy resin fiber (FR-4) substrate material. The reflection and transmission characteristics of the unit cell were achieved by utilizing finite integration technique based simulation software. Measured results were presented, which complied well with simulated results. The unit cell was then applied to build a single layer rectangular-shaped cloak that operates in the C-band region where a metal cylinder was perfectly hidden electromagnetically by reducing the scattering width below zero. Moreover, the unit cell shows NZRI property there. The experimental result for the cloak operation was presented in terms of S-parameters as well. In addition, the same metamaterial shell was also adopted for designing an eye-shaped and triangular-shaped cloak structure to cloak the same object, and cloaking operation is achieved in the C-band, as well with slightly better cloaking performance. The novel design, NZRI property, and single layer C-band cloaking operation has made the design a promising one in the electromagnetic paradigm.
Highlights
Hiding an object or making something invisible, has received a great deal of interest in the scientific community from the beginning of the modern age
The utilization of a metasurface instead of bulk metamaterials has received a great deal of attention by researchers as an alternative approach to reduce the scattering cross-section (SCS) [20,21,22,23,24,25,26]
To form a near zero refractive index property, the series branch of the unit cell circuit must contain an inductance or capacitance, and the corresponding shunt branch must contain the opposite order of reactance
Summary
Hiding an object or making something invisible, has received a great deal of interest in the scientific community from the beginning of the modern age. The utilization of a metasurface instead of bulk metamaterials has received a great deal of attention by researchers as an alternative approach to reduce the SCS [20,21,22,23,24,25,26]. This type of surface offers similar exotic properties to those of metamaterials, but in easier way and with better functionality. Some topology optimization based studies were performed, based on the shape (triangular and diamond shape) of the cloak, to optimize cloak operation in the C-band
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