Conference Papers

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Author: search.filters.author.Joshi, R.Has files: No

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    Design and study of magnetization characteristics of a magnetostrictive (Tb0.3Dy0.7Fe1.95) actuator under zero pre-stress conditions for direct current input
    (2013) Joshi, R.; Kadoli, R.
    This paper presents the design of actuator using magnetostrictive material under zero prestress conditions for direct current input, which is being developed to move friction pads of a disc brake for braking action. Comparison of analytical, experiment and Maxwell simulation of coils in free air is being carried out to predict the magnetic field generated by them and magneto motive force reaching the measuring end of magnetostrictive material. Experiments are being conducted to verify the performance of magnetostrictive actuator for dc input under zero-preload conditions. A set of magnetization curves are being predicted using Jiles-Atherton model in the context of control applications that require an accurate characterization of the relation between input applied magnetic field and strain output by the actuator. Further the validation of Jiles-Atherton model results is being done with the results obtained from experiments. © (2013) Trans Tech Publications, Switzerland.
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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.