Abstract Vortex beams carrying orbital angular momentum (OAM) have aroused great interest of both scientific and engineering communities. Encouragingly, generating OAM with different topological charges in a shared aperture is regarded as a potential route to expanding the communication capacity, which yet is an academic challenging task. In this work, a paradigm of designing metasurface-based shared aperture antenna for generating polarization-dependent vortex beams with distinct topological charges is proposed. Anisotropic unit cells that can tailor different resonance phase profiles in two orthogonal orientations are used to assemble a metasurface reflector. As a proof-of-concept, a planar reflector antenna is designed with two Vivaldi sources, which can generate x- and y-polarized vortex beams with topological charges of l=-1 and l=-2, respectively. Both the simulation results and the measurement results are in good agreement, which demonstrates the feasibility of our design. Significantly, this work provides a new route to achieving vortex beams carrying different topological charges in the same frequency band, which may have potential applications in communication systems.
Fund: Project supported by the National Natural Science foundation of China (Grant No. 61971347).
Corresponding Authors:
He Wang
E-mail: 18066540235@163.com
Cite this article:
He Wang(王贺), Yong-Feng Li(李勇峰), and Shao-Bo Qu(屈绍波) Shared aperture metasurface antenna for electromagnetic vortices generation with different topological charges 2021 Chin. Phys. B 30 084101
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