International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 10 Issue: 12 | Dec 2023
p-ISSN: 2395-0072
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Study of Multiple Plasmon Resonance based Broadband CrossPolarization Conversion on an Anisotropic Metasurface Tanu Singh Sisodia*, B. P. Singh, Department of Physics, Dr. Bhimrao Ambedkar University, Agra (U.P.), India ---------------------------------------------------------------------***--------------------------------------------------------------------To create miniaturized polarization control Abstract - This paper presents the design and devices with wide bandwidths and stable responses, it simulation of a broadband microwave Crossis necessary to develop artificial structures. One type of Polarization-Conversion (CPC) metasurface. The engineered electromagnetic structures that have been metasurface is composed of a Split Ring Resonator (SRR) widely researched are metamaterials [9, 10]. These with two splits placed on perpendicular sides, and a structures utilize periodic sub-wavelength patterning Circular Splitted Ring Resonator (C-SRR) printed over a to achieve macroscopic responses that are not found in copper-backed FR4 dielectric substrate within these natural materials. Metasurfaces [11,12], which are twosplits. The simulation results demonstrate that the dimensional analogs of metamaterials, have gained metasurface exhibits excellent CPC performance, increased attention for their ability to Metasurfaces achieving a 3 dB fractional bandwidth of up to 73% over have gained significant attention in recent years as a the frequency range of 5 to 15 GHz, for both normal and means of controlling the polarization of oblique incidences. The metasurface's response is electromagnetic waves. Anisotropic [13-16] and chiral unaffected by the incidence angle and polarization of the metamaterials [17] have been extensively studied due incoming wave due to its symmetric structure and subto their unique electromagnetic properties, including wavelength unit cell size. This makes it a promising bi-anisotropy, magneto-electric coupling, and elliptical candidate for practical applications. Multiple plasmonic or circular dichroism, in both linear [18, 19] and resonances at three distinct frequencies (5.5 GHz, 8.2 circular polarization [20, 21]. GHz, and 14.1 GHz) contribute to the broadband In this work a broadband polarization polarization conversion exhibited in this study. The converter composed of a split ring resonator (SRR) numerical and simulation results of the proposed design with a circular split ring resonator (C- SRR) in the have been validated. middle as a unit cell on the top surface of a metalbacked FR4 dielectric substrate is presented. The Key Words: Metasurface, Plasmon resonances, objective of this paper is to introduce an electrically Anisotropy, Cross-Polarization Conversion (CPC). thin metasurface that provides broadband polarization 1.INTRODUCTION conversion for both normal and oblique incidences. The proposed design utilizes an anisotropic unit cell Recent research has reported successful structure to achieve cross polarization along the u- and polarization conversion across different frequency v-axes, and extends the operating bandwidth through ranges of the electromagnetic spectrum, employing three plasmonic resonances. The proposed various geometric elements. For instance, plasmonic metasurface has three distinctive characteristics: the nano-rods have been utilized to achieve this goal in the substrate has a very small thickness, the unit cell visible spectrum [1]. circular split rings in the infrared structure is unique, and the unit cell size is sub[2] self-complementary rings [3] rectangular loops with wavelength. These features enable the metasurface to diagonal microstrips [4], Different structures, V-shaped have the same response for both x- and y- polarization patches [5], inverted L-shaped resonators in diagonals . and remain insensitive to incidence angles up to [6] and circular patches along the diagonal [7]. A reflective anisotropic metasurface-based multifaceted broadband polarization rotator [8]. Multilayer structures, on the other hand, are typically incompatible with modern planar polarization control devices. © 2023, IRJET
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