Browsing by Author "Mukherjee, J."

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    A novel beam steering dipole antenna using phase varying metasurface as reflector
    (Institute of Electrical and Electronics Engineers Inc., 2018) Majumder, B.; Mukherjee, J.; Kandasamy, K.; Ray, K.P.
    In this paper a simulation based study of a novel continuously beam steerable antenna is presented using a tunable metasurface as phase varying reflector. The antenna radiation pattern can be changed by changing the state of the diodes loaded in the phase varying reflector. A planar dipole antenna is used to excite the tunable reflector. By this technique the antenna beam can be steered from +300 to -300 in the broadside direction depending on the operating state of the diodes. Moreover, the state of the diodes can be addressed digitally and hence a steep gradient in phase can be achieved in the reflector. The antenna radiation pattern and the gain has been found stable all over its states. © 2017 IEEE.
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    A novel beam steering dipole antenna using phase varying metasurface as reflector
    (2018) Majumder, B.; Mukherjee, J.; Krishnamoorthy, K.; Ray, K.P.
    In this paper a simulation based study of a novel continuously beam steerable antenna is presented using a tunable metasurface as phase varying reflector. The antenna radiation pattern can be changed by changing the state of the diodes loaded in the phase varying reflector. A planar dipole antenna is used to excite the tunable reflector. By this technique the antenna beam can be steered from +300 to -300 in the broadside direction depending on the operating state of the diodes. Moreover, the state of the diodes can be addressed digitally and hence a steep gradient in phase can be achieved in the reflector. The antenna radiation pattern and the gain has been found stable all over its states. � 2017 IEEE.
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    Study on wettability of plasma spray coated oxide ceramic for hydrophobicity
    (Elsevier B.V., 2020) Mazumder, A.; Nagaraj, N.; Sethi, S.; Prabhu, K.N.; Mukherjee, J.
    Many industrial applications require hydrophobic surfaces with high-temperature compatibility. Ceramic surfaces, which have excellent endurance for high-temperature, are generally hydrophilic. For such applications, the required hydrophobicity is induced in ceramic surfaces with suitable polymeric agents by using different surface grafting techniques. To avoid the costly grafting process, suitable hydrophobic ceramic surfaces have to be designed for direct use in such applications. Rare earth oxides show hydrophobicity due to their electronic configurations. Hence, for the selection of hydrophobic ceramic material for real engineering components, three plasma spray-coated surfaces have been characterized for their water contact angle. In this study, yttria (Y2O3) was used as a rare earth oxide along with yttria stabilized zirconia (YSZ) and alumina (Al2O3) for comparison of surface properties. The dependence of contact angle on various experimental parameters was established. It was observed that cleaning with water induces temporary hydrophobicity in alumina even after baking at 180 °C. Yttria coating was found to be distinctly hydrophobic with the contact angle more than 115°. The hydrophobic behaviour of yttria was found to be permanent and does not degrade with environmental exposure. The apparent surface energies of the samples were estimated based on acid-base theory. The apparent surface energies of the studied samples were found to be in the range of 35 mJ/m2 to 42 mJ/m2. © 2020 Elsevier B.V.