Conference Papers

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    MIMO radar with spatial-frequency diversity for improved detection performance
    (2010) Shanbhag, K.V.; Deb, A.; Kulkarni, M.
    The Multiple Input Multiple Output (MIMO) radar concept exploits the independence between signals at the array elements unlike beamforming which presumes a high correlation between signals either transmitted or received by an array. Radar Cross Section (RCS) of a complex target varies with both transmitted frequency and target geometry. By widely separating transmit and receive antennas, MIMO radar systems observe a target simultaneously from different aspects resulting in spatial diversity, thus improving the detection performance. Also by utilizing different frequencies, independent RCS of the target can be observed, thus resulting in frequency diversity. In this paper, the spatial and the frequency diversities are studied together to bring out the combined benefits. The system proposed will not only have several antennas appropriately spaced but also several operating frequencies appropriately spaced, providing a better detection performance than conventional MIMO radar systems for the same transmission power. The simulation results exhibit a better detection performance of the proposed system as compared to MIMO radar systems with only spatial diversity. ©2010 IEEE.
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    Switchable Wideband phase Gradient Beam Steering Reflector/Absorber for Applications such as Intelligent Reflecting Surfaces
    (Institute of Electrical and Electronics Engineers Inc., 2023) Janawade, S.A.; Krishnan, K.; Kandasamy, K.
    A miniaturized dual functional phase gradient meta-structure for beam steering and simultaneous RCS reduction is proposed in this work. A unit cell is designed, which generates a complete phase profile from -90° to 90° to direct the incident beam in all directions. The novelty in the proposed work is that the realized unit cell can reflect incident EM waves with 99.9% efficiency over a wide range of frequencies from 1 Hz to 40 GHz. Also, when the unit cell is loaded with lumped elements like a resistor and capacitor, it acts as an absorber. The magnitude of absorption is controlled by resistor, which can be varied from 79.17% to 99.97%, whereas the frequency at which absorption occurs can be tuned by varying capacitance. This unit cell configuration could achieve beam steering at sub 6 GHz, K and Ka-band frequencies. The dimensions of the proposed meta-atom is 8.4x8.4x1.56 mm3 and formulated on Rogers RT duroid 5880. © 2023 IEEE.