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Deriving Mutual Impedance Matrix of a Large Antenna Array from Embedded Element Patterns with Measurement Noise

Journal
Date Issued
2024
Author(s)
•
Kovaleva, Maria
•
Warnick, Karl F.
•
Davidson, David B.
•
DOI
Abstract
Measuring 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.
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0018-926X
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