  The reconfigurable intelligent surface (RIS) has received a lot of interest
because of its capacity to reconfigure the wireless communication environment
in a cost- and energy-efficient way. However, the realistic power consumption
modeling and measurement validation of RIS has received far too little
attention. Therefore, in this work, we model the power consumption of RIS and
conduct measurement validations using various RISs to fill this vacancy.
Firstly, we propose a practical power consumption model of RIS. The RIS
hardware is divided into three basic parts: the FPGA control board, the drive
circuits, and the RIS unit cells. The power consumption of the first two parts
is modeled as $P_{\text {static}}$ and that of the last part is modeled as
$P_{\text {units}}$. Expressions of $P_{\text {static}}$ and $P_{\text
{units}}$ vary amongst different types of RISs. Secondly, we conduct
measurements on various RISs to validate the proposed model. Five different
RISs including the PIN diode, varactor diode, and RF switch types are measured,
and measurement results validate the generality and applicability of the
proposed power consumption model of RIS. Finally, we summarize the measurement
results and discuss the approaches to achieve the low-power-consumption design
of RIS-assisted wireless communication systems.
