RIS-Aided Wireless Multiport Sensing: Multiplexed De-Embedding of an RIS-Programmable Over-the-Air Fixture

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Researchers have developed a method to characterize multi-port devices in inaccessible locations by using a Reconfigurable Intelligent Surface (RIS) to create measurement diversity over a single wireless link. This technique allows for the remote retrieval of scattering matrices without increasing the number of physical antennas, reducing the hardware footprint for complex sensing environments. Commercially, this paves the way for lower-cost, high-precision RFID sensing in in