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A Scalable, Binary Phase, Millimeter-Wave Reconfigurable Intelligent Surface

https://doi.org/10.1109/IMS40175.2024.10600436

Shekhawat, Aditya S; Kashyap, Bharath G; Torres, Russell_W Raldiris; Trichopoulos, Georgios C (June 2024, IEEE)

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Heterogeneous Integration of Biasing Circuits for mmWave Reconfigurable Intelligent Surfaces

https://doi.org/10.23919/USNC-URSINRSM60317.2024.10464792

Raldiris_Torres, Russell W; Shekhawat, Aditya S; Kashyap, Bharath G; Trichopoulos, Georgios C (January 2024, IEEE)

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A Sub-THz Micro-Doppler Radar for Counter-Surveillance Applications

https://doi.org/10.23919/USNC-URSI54200.2023.10288625

Kashyap, Bharath G.; Trichopoulos, Georgios C. (July 2023, IEEE)

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Design and Evaluation of Reconfigurable Intelligent Surfaces in Real-World Environment

https://doi.org/10.1109/OJCOMS.2022.3158310

Trichopoulos, Georgios C.; Theofanopoulos, Panagiotis; Kashyap, Bharath; Shekhawat, Aditya; Modi, Anuj; Osman, Tawfik; Kumar, Sanjay; Sengar, Anand; Chang, Arkajyoti; Alkhateeb, Ahmed (January 2022, IEEE Open Journal of the Communications Society)

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Fabrication and Characterization of a 900-Element 222.5 GHz Single-bit Reflective Surface with Suppressed Quantization Lobes

https://doi.org/10.23919/USNC-URSINRSM51531.2021.9336511

Kashyap, Bharath G.; Theofanopoulos, Panagiotis C.; Cui, Yiran; Trichopoulos, Georgios C. (January 2021, 2021 United States National Committee of URSI National Radio Science Meeting (USNC-URSI NRSM))

We present a topology for suppressing quantization lobes in 1-bit reconfigurable reflective surfaces (RRSs). RRSs are planar surfaces that redirect the imping waves to the desired direction through phase modulation. For single-bit modulation, plane-wave illuminated RRSs exhibit quantization lobes due to the limited number of available phase bits. To eliminate such lobes, we randomize the quantization error by employing a fixed but random phase delay in every unit-cell of the RRS. Specifically, we focus on the fabrication and characterization of a mmWave single-layer, 1-bit, 30×30 randomized RRS designed at 222.5 GHz. The quasi-optical RCS characterization of the fabricated RRS demonstrates the successful suppression of the quantization lobe using the proposed technique.
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Mitigating Quantization Lobes in mmWave Low-Bit Reconfigurable Reflective Surfaces

https://doi.org/10.1109/OJAP.2020.3034049

Kashyap, Bharath G.; Theofanopoulos, Panagiotis C.; Cui, Yiran; Trichopoulos, Georgios C. (January 2020, IEEE Open Journal of Antennas and Propagation)

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