Journal
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
Volume 69, Issue 3, Pages 1440-1454Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TAP.2020.3016479
Keywords
Integrated circuits; Surface impedance; Impedance; Topology; Electromagnetics; Inductance; Intelligent reconfigurable metasurface; polarization control; tunable perfect absorption (PA); wavefront manipulation
Funding
- European Union Horizon 2020 Research and Innovation Programme-Future Emerging Topics (FETOPEN) [736876]
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This article presents the design evolution and theoretical considerations of a proof-of-concept reconfigurable metasurface, primarily used as a tunable microwave absorber and for wavefront manipulation. The design, co-designed with an IC chip, can achieve multiple tunable functionalities and perfect absorption for various angles of linear polarization. The end vision is for this design to scale and deploy as a practical HyperSurface with reconfigurable functionalities.
In this article, we present the theoretical considerations and the design evolution of a proof-of-concept reconfigurable metasurface, primarily used as a tunable microwave absorber, but also as a wavefront manipulation and polarization conversion device in reflection. We outline the design evolution and all considerations taken into account, from the selection of patch shape, unit cell size, and substrate to the topology of the structure that realizes the desired tunability. The presented design conforms to fabrication restrictions and is codesigned to work with an integrated circuit (IC) chip for providing tunable complex loads to the metasurface, using a commercially available semiconductor process. The proposed structure can perform multiple tunable functionalities by appropriately biasing the IC. Perfect absorption for a wide range of incidence angles of both linear polarization states, accommodating a spectral range in the vicinity of 5 GHz, with potential also for wavefront control, exemplified via anomalous reflection and polarization conversion. The end vision is for such a design to be scalable and deployable as a practical HyperSurface, i.e., an intelligent multifunctional metasurface capable of concurrent reconfigurable functionalities: absorption, beam steering, polarization conversion, wavefront shaping, holography, and sensing.
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