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In this paper we focus on phase dependent loss (PDL), an important aspect ofreconfigurable intelligent surfaces (RIS) where the signals reflected from theRIS elements are attenuated by varying amounts depending on the phase rotationprovided by the element. To evaluate the effects of PDL, we analyse the SNR ofa SIMO RIS-aided wireless link. We assume that the channel between the basestation (BS) and RIS is a rank-1 LOS channel while the user (UE)-BS and UE-RISare correlated Rayleigh channels. The RIS design is optimal in the absence ofPDL and maximizes the SNR in this scenario. Specifically, we derive a closedform expression for the mean SNR in the presence of PDL. The attenuationfunction used for PDL was developed from a detailed circuit analysis of RISelements. Leveraging the derived results, we analytically characterise theimpact of PDL on the mean SNR. Numerical results are conducted to validate thederived expressions and verify the analysis.

Phase Dependent Loss Analysis for RIS Systems