Impact of Multiple RIS on Channel Characteristics: An Experimental Validation in Ka Band. - Taghrid Mazloum; Luca Santamaria; Frederic Munoz; Antonio Clemente; Jean-Baptiste Gros; Youssef Nasser; Mikhail A. Odit; Geoffroy Lerosey; Raffaele D'Errico (EuCNC/6G Summit, 2023)