The paper derives a multiport network model for reconfigurable pinching antennas and a directional-coupler design, but the claimed global optimality for the ideal case is invalid.
K.et al.A tutorial on fluid antenna system for 6G networks: Encompassing communication theory, optimization methods and hard- ware designs.IEEE Commun
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Multiport Network Modeling and Optimization for Reconfigurable Pinching-Antenna Systems
The paper derives a multiport network model for reconfigurable pinching antennas and a directional-coupler design, but the claimed global optimality for the ideal case is invalid.