RIS with Continuous Amplitude and Phase Control: Functional Testing Method and Implementation - Krasov, Pavlo S.; Iupikov, Oleg A.; Vilenskiy, Artem R.; Zhu, Yuqing; Ivashina, Marianna V. (2025 19th European Conference on Antennas and Propagation (EuCAP), Antennas and Propagation (EuCAP), 2025 19th European Conference on, 2025)