Fig. 15From: RIS-enabled smart wireless environments: deployment scenarios, network architecture, bandwidth and area of influencePIN-diode-based R-RIS unit cell characterisation: a structure, b magnitude and c phase of the \(\textrm{S}11\) parameter for states 000 and 180, and d contrast of the \(\textrm{S}11\) parameter for these states as a function of the frequency in GHzBack to article page