In the artificial intelligence-driven modern wireless communication system,antennas are required to be reconfigurable in terms of size according to changing application scenarios.However,conventional antennas with con...In the artificial intelligence-driven modern wireless communication system,antennas are required to be reconfigurable in terms of size according to changing application scenarios.However,conventional antennas with constant phase distributions cannot achieve enhanced gains in different reconfigurable sizes.In this paper,we propose a mechanically reconfigurable radiation array(RRA)based on miniaturized elements and a mechanically reconfigurable system to obtain gain-enhanced antennas in compact and deployed states.A five-element RRA with a phase-reconfigurable center element is designed and analyzed theoretically.The experimental sample has been fabricated,driven by a deployable frame with only one degree of freedom to realize the size and phase distribution reconfiguration simultaneously to validate the enhanced gains of RRA.The proposed RRA can be tessellated into larger arrays to achieve higher gains in other frequency regimes,such as terahertz or photonics applications with nanometer fabrication technology.展开更多
Rigid origami has great potential in aerospace applications,especially deployable polyhedrons with one degree of freedom(DOF)and flat-foldability,whose types are few to date.In this paper,we create a novel foldable cu...Rigid origami has great potential in aerospace applications,especially deployable polyhedrons with one degree of freedom(DOF)and flat-foldability,whose types are few to date.In this paper,we create a novel foldable cube and a rhombic dodecahedron by introducing slits and diagonal creases to the surfaces,whose one-DOF rigid and flat-foldable properties are verified by kinematic analysis.Then,based on the isohedral quadrilateral transform,we project the creases and slits of the rhombic dodecahedron onto a tetrahedron to obtain a novel foldable tetrahedron that has two flat-foldable motion paths due to the existence of collinear creases.Following the second path,unnecessary creases are removed,and an origami tetrahedron with simplified creases is constructed.Both origami tetrahedrons possess a small folded area.Kinematic analysis reveals that these newly discovered origami polyhedrons are flat-foldable with one DOF,demonstrating favorable application prospects for space architectures and extraterrestrial habitats.展开更多
文摘In the artificial intelligence-driven modern wireless communication system,antennas are required to be reconfigurable in terms of size according to changing application scenarios.However,conventional antennas with constant phase distributions cannot achieve enhanced gains in different reconfigurable sizes.In this paper,we propose a mechanically reconfigurable radiation array(RRA)based on miniaturized elements and a mechanically reconfigurable system to obtain gain-enhanced antennas in compact and deployed states.A five-element RRA with a phase-reconfigurable center element is designed and analyzed theoretically.The experimental sample has been fabricated,driven by a deployable frame with only one degree of freedom to realize the size and phase distribution reconfiguration simultaneously to validate the enhanced gains of RRA.The proposed RRA can be tessellated into larger arrays to achieve higher gains in other frequency regimes,such as terahertz or photonics applications with nanometer fabrication technology.
基金XZ acknowledges financial support from the Natural Science Foundation ofChina(Project No.52105032)YC grate-fully acknowledges financial support from the Natural Science Founda-tion ofChina(Project No.51825503)+1 种基金the Tencent Foundation(Grant XPLORER-2020-1035)ML acknowledges financial support from the Natural Science Foundation of Shanghai(23ZR 1462600).
文摘Rigid origami has great potential in aerospace applications,especially deployable polyhedrons with one degree of freedom(DOF)and flat-foldability,whose types are few to date.In this paper,we create a novel foldable cube and a rhombic dodecahedron by introducing slits and diagonal creases to the surfaces,whose one-DOF rigid and flat-foldable properties are verified by kinematic analysis.Then,based on the isohedral quadrilateral transform,we project the creases and slits of the rhombic dodecahedron onto a tetrahedron to obtain a novel foldable tetrahedron that has two flat-foldable motion paths due to the existence of collinear creases.Following the second path,unnecessary creases are removed,and an origami tetrahedron with simplified creases is constructed.Both origami tetrahedrons possess a small folded area.Kinematic analysis reveals that these newly discovered origami polyhedrons are flat-foldable with one DOF,demonstrating favorable application prospects for space architectures and extraterrestrial habitats.
