Conference Papers
Permanent URI for this collectionhttps://idr.nitk.ac.in/handle/123456789/28506
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Item Active Multifunctional Reflective Metasurface for Linear to Cross and Linear to Circular Polarization Conversion Applications(Institute of Electrical and Electronics Engineers Inc., 2024) Goud, R.M.; Paul, P.; Majumder, B.; Kandasamy, K.A low-profile reconfigurable reflective metasurface capable of dynamically switching polarization conversion functionalities is proposed in this work. To realize this, a single-layered metasurface comprising tapered rectangular metal strips oriented diagonally with a Z-shaped conducting strip in the middle and L-shaped metal strips along the corners is etched on a substrate backed by a conducting layer. A diode is positioned at the center of the diagonally oriented structure, and the switching is controlled using a radial stub-based DC biasing circuit. When the PIN diode is turned OFF, the tunable metasurface reflects cross-polarized waves in the frequency spectrum ranging from 12.3- 15.5 GHz, whereas, in the ON state, it converts linear polarized waves into orthogonally polarized waves from 14.83- 15.83 GHz, also converts linear to left-handed and right-handed circular polarization with an axial ratio of less than 3 dB across four distinct frequency bands. The 45° orientation of the metallic layer makes the structure polarization-independent and can be best used for radar cross-section (RCS) reduction and future wireless and satellite communications simultaneously. © 2024 IEEE.Item High Transmissive Beam-Focusing Lenses based on All-dielectric Metasurface(Institute of Electrical and Electronics Engineers Inc., 2025) Goud, R.M.; Paul, P.; Majumder, B.; Kandasamy, K.This paper presents the design and analysis of a fully dielectric transmissive metasurface tailored for beam-focusing applications in the microwave frequency regime, specifically targeting operation at 20 GHz in K-band. The metasurface functions as a high-gain lens, employing flame-retardant resin to construct meta-atoms composed of cylindrical dielectric structures positioned on a dielectric substrate. By modulating the height of these cylinders, a continuous phase gradient ranging from 0° to 360° is achieved, enabling precise wavefront control for focusing incident electromagnetic waves along the broadside direction. Each meta-atom is optimized to maintain a transmittance greater than 90%, ensuring minimal energy loss during transmission. The required phase distribution across the metasurface is initially derived using MATLAB-based numerical synthesis, followed by full-wave parametric simulations in CST Studio Suite to correlate the geometrical variations with the desired phase shifts. Unlike conventional designs that rely on metallic inclusions or ground planes, this work introduces a novel all-dielectric architecture, offering advantages in cost-effective 3D printing fabrication, reduced weight, and enhanced efficiency. The 1D and 3D radiation patterns confirm the beam-focusing behavior of the metasurface, demonstrating its potential for integration into compact, high-performance lens-based systems for advanced wireless communication and radar applications. © 2025 IEEE.