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• W4285819005 abstract "In this research study, a novel hybrid approach to beam steering based on the combination of true time delay and phase shift to enable continuous beam steering with minimal beam squint in wideband mm-wave transceivers is investigated. With modern high-speed communication links in the mm-wave spectrum requiring ever higher bandwidths, and losses increasing with frequency, there is a need for steerable arrays in mobile applications. This steering capability is commonly realized by phase shifters, which enable continuous beam direction control, but produce significant beam squint at large bandwidths or steering directions. An alternative is to use a time-delayed control, which resolves the squint issue but covers only a limited number of beam directions, producing considerable loss and being large in size. This research work presents the first 2-bit time delay stage operating above 200 GHz. In addition, a novel approach is described to enable broadband continuous beam control with minimal beam squint; this is achieved by combining the time delay circuit with a 90° vector-sum phase shifter. To prove the concept, the circuit is realized in a 130-nm SiGe Bipolar Complementary Metal Oxide Semiconductor (CMOS) (BiCMOS) technology. At 4.33 mW of dc power consumption, the small-signal gain is −8.6 dB at a 3-dB band of 220–250 GHz, resulting in 12.8% of relative bandwidth. The time delay stage provides coarse beam direction control with a maximum steering angle of 43.9° resulting from a maximum delay of 1.47 ps with a resolution of 0.39 ps. Across all tuning states, the root-mean-square delay error is less than 23.7 fs. The following phase shifter enables fine direction control while also compensating ±1.5 dB of gain variation resulting from the time delay. This is achieved while reducing the area consumption to half of what is required for comparable true time delay circuits. In a minimal <inline-formula xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink> <tex-math notation=LaTeX>$2times 1$ </tex-math></inline-formula> antenna array, this enables continuous beam direction control between ±54.6° while limiting the beam squint to less than 2.5°, equating to a more than 75% reduction in comparison to the common phase shift approach." @default.
• W4285819005 created "2022-07-19" @default.
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• W4285819005 date "2022-09-01" @default.
• W4285819005 modified "2023-10-12" @default.
• W4285819005 title "A Hybrid True-Time and Phase-Delayed Approach for Millimeter-Wave Beam Steering" @default.
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• W4285819005 doi "https://doi.org/10.1109/tmtt.2022.3189987" @default.
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