Fig. 13From: RIS-enabled smart wireless environments: deployment scenarios, network architecture, bandwidth and area of influenceVaractor-based R-RIS unit cell characterisation: a operation principle, b magnitude and c phase of the \(\textrm{S}11\) parameter for various capacitances, and d contrast of the \(\textrm{S}11\) parameter for various capacitance values versus the frequency in GHzBack to article page