Reconfigurable intelligent surfaces need on the order of 10^4 to 10^5 elements to match pinching antenna systems in mmWave spectral efficiency, and pinching antennas show much higher energy efficiency under the assumed hardware power model.
Intelligent reflecting surface versus decode-and-forward: How large surfaces are needed to beat relaying?
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Pinching Antenna Systems versus Reconfigurable Intelligent Surfaces in mmWave
Reconfigurable intelligent surfaces need on the order of 10^4 to 10^5 elements to match pinching antenna systems in mmWave spectral efficiency, and pinching antennas show much higher energy efficiency under the assumed hardware power model.