Faculty Publications

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Publications by NITK Faculty

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    Zero energy visible light communication receiver for embedded applications
    (Association for Computing Machinery, 2018) Prabhakar, T.V.; Shashidhar, V.; Meghana, G.S.A.; Venkatesha Prasad, R.V.; Pranavendra, G.V.
    Internet of Things is bringing multiple domains and multiple avenues to connect anything and everything. It mainly uses RF connectivity. However, recently visible light communication (VLC) is also being explored. VLC has the properties that are unique with respect to the privacy and security that it provides. Though the transmission is of broadcast in nature the receiver needs to be in the vicinity of the transmitter, thus providing secure communications. Further, when low power receivers need to be constructed, it is important to harness energy from transmission itself. In this article we propose a novel design for a receiver to be used in VLC for embedded systems. The setup works, using a small solar panel (2mm × 2mm) as a medium to simultaneously harvest incident light energy and receive data bit streams. The LED source was modulated using On-Off Keying. The receiver works for close range communications. The results in this paper show experimental evaluation of the system. We could detect the signals from the source using harvested energy from the same transmission. © 2018 Authors.
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    Polarization-Insensitive Wide-Angle Reception Triple-Band Metamaterial Unit Cell for Electromagnetic Energy Harvesting
    (Institute of Electrical and Electronics Engineers Inc., 2021) Polaiah, G.; Kandasamy, K.; Kulkarni, M.
    An efficient triple-band metamaterial unit cell with polarization-independent and wide-angle reception is proposed for ambient low-power electromagnetic energy harvesting applications. The unit cell top metal layer is composed of opposite corners circularly truncated square patch surrounded by a closed square ring with a small gap for coupling and the bottom metal layer is a full ground plane. The metal via is placed near the center by connecting the top patch and ground plane for harvesting the received electromagnetic power. This metal via is further connected to the ground in the bottom layer through a 50 Ω resistor. The received power is channeled through metal via and collected at resistive load. Simulation results show that the maximum harvesting efficiencies of 85.9%, 96.3%, and 95.8% are achieved at 2.66 GHz, 5.40 GHz, and 6.29 GHz frequencies in both transverse electric (TE) and transverse magnetic (TM) polarizations from 0° to 60° incidence angles. © 2021 IEEE.