KYRIAKOU, GeorgiosGeorgiosKYRIAKOUKovaleva, MariaMariaKovalevaWarnick, Karl F.Karl F.WarnickDavidson, David B.David B.DavidsonBOLLI, PietroPietroBOLLI2025-01-212025-01-2120240018-926Xhttp://hdl.handle.net/20.500.12386/35688Measuring the in situ mutual impedance matrix of a large phased array with a quasi-random element layout is a very challenging operation. A recently developed method for extracting the impedance matrix of a phased array of antennas from its embedded element patterns is implemented and tested with a cluster of 16 log-periodic antennas that served as a Square Kilometer Array (SKA) prototype. The extraction algorithm is improved in its convergence with physics-based bounds based on the diagonally dominant structure of the impedance matrix. Embedded element patterns corrupted by noise arising both by random as well as propagation-related phenomena in a receiving system are then used to test the robustness of the method; such embedded element patterns are artificially created but the noise estimates from real on-site measurements are also used for comparison. The mutual impedance matrices extracted from the 'noisy' radiation patterns at 110 and 320 MHz are accurate to within 2 to 3%. This work has direct application to the SKA-Low telescope.STAMPAenArticle10.1109/TAP.2024.34703112-s2.0-85206469005https://api.elsevier.com/content/abstract/scopus_id/85206469005https://ieeexplore.ieee.org/document/10705944FIS/05 - ASTRONOMIA E ASTROFISICAERC sectors::Physical Sciences and Engineering::PE9 Universe sciences: astro-physics/chemistry/biology; solar systems; stellar, galactic and extragalactic astronomy, planetary systems, cosmology, space science, instrumentation::PE9_17 Instrumentation – telescopes, detectors and techniques