Systematic analysis of a RF-choke enabled 2-bit reconfigurable digitally-coded metasurface for 5G/6G beam-steering applications

Saha, Dipankar, Ghosh, Swarnadipto, Ekpo, Sunday ORCID: https://orcid.org/0000-0001-9219-3759, Chakraborty, Samik and Elias, Fanuel (2023) Systematic analysis of a RF-choke enabled 2-bit reconfigurable digitally-coded metasurface for 5G/6G beam-steering applications. In: 22nd International Symposium on Communications and Information Technologies (ISCIT2023), 16 October 2023 - 18 October 2023, Sydney, Australia. (In Press)

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Abstract

A radio frequency (RF) choke-enabled 2-bit reflecting metasurface unit cell has been proposed with a highly improved reflection efficiency for all four possible diode states (‘00’, ‘01’, ‘10’, and ‘11’) with almost equi-spaced reflection phase responses (‘121o’, ‘42o’, ‘-47o’, and ‘-125o’). Different reflection phase responses can be achieved from the same unit-cell using the switching mechanism of ON-OFF states of the two SMP1340_079 pin-diodes. RF-Choke circuit is added as part of the biasing network of the meta-atom to achieve approximately 92% reflection efficiency. The reconfigurable metasurface is implemented with a 12×12 array of the proposed unit cell and illuminated with a horn antenna, keeping the f/d ratio of 0.8. The scattered field by the metasurface with changing phase gradients using various coding patterns, is predicted by a semi analytical method for different target angles (-600, -300, 00, +300, +600) for 5G beam steering application.