Faculty Publications

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    Reflective Metasurface for Ultra-Wide Band Polarization Conversion with good Angular Stability
    (Institute of Electrical and Electronics Engineers Inc., 2024) Joshi, R.; Goud, R.M.; Paul, P.; Kandasamy, K.
    This paper presents a compact metasurface that provides linear to circular polarization over an ultra-wide band range of frequencies with good angular stability. The unit cell consists of a metallic circular ring with tapered rectangular metallic strips connected along the diagonal. The proposed Polarization Conversion Metasurface (PCM) consists of a 10x10 array of the unit cells and exhibits polarization conversion over a wide bandwidth of 11.5 GHz -32 GHz (94.25%). The design is validated using CST simulations and graphs are plotted for the various metrics evaluated. The proposed design exhibits angular stability till the 15° of angle of incidence. Owing to its high angular stability and ultra-wide band operation covering C, X, Ku, K bands, the proposed design is best suited for future wireless communication, MIMO communication and for RCS reduction and stealth applications. © 2024 IEEE.
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    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.