Abstract: An unscented Kalman filter-based beam tracking system and a method thereof are proposed. The system includes a base station for performing beamforming to an unmanned aerial vehicle, and the base station includes a pre-processing unit for deriving an expected vector value for a movement trajectory of the UAV with a signal received from the UAV and selecting at least one sigma point from the derived expected vector value, a covariance derivation unit for deriving an autocovariance by inputting the selected sigma point to a nonlinear measurement function and deriving a cross-covariance with the derived expected vector value and the derived autocovariance, and a beam estimation unit for deriving a beamforming angle for a future movement trajectory of the UAV by deriving an unscented Kalman filter gain from the derived autocovariance and derived cross-covariance, thereby having effects of a low mean square error, high spectral efficiency, high accuracy of beam tracking.

Abstract: By forming a monolayer of metal core-shell nanoparticles, transferring the monolayer to various substrates and removing the shells surrounding the particles by way of selective etching, it is possible to form large-area uniform nanogap structures very easily. In addition, a nanogap is formed by an ultrasmall void having no limitation in diffusion between metal cores through Van der Waals interaction between the metal core particles, as the etching proceeds. It is possible to enhance a near-field significantly around the nanogap structure.

Abstract: By forming a monolayer of metal core-shell nanoparticles, transferring the monolayer to various substrates and removing the shells surrounding the particles by way of selective etching, it is possible to form large-area uniform nanogap structures very easily. In addition, a nanogap is formed by an ultrasmall void having no limitation in diffusion between metal cores through Van der Waals interaction between the metal core particles, as the etching proceeds. It is possible to enhance a near-field significantly around the nanogap structure.