A Broadband Multipole Method for Accelerated Mutual Coupling Analysis of Large Irregular Arrays Including Rotated Antennas
(2025) IEEE Transactions on Antennas and Propagation — Vol. 73, n° 5, p. 3133-3145 (2025)
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- Abstract
- We present a numerical method for the analysis of mutual coupling (MC) effects in large, dense, and irregular arrays with identical antennas. Building on the method-of-moments (MoM), our technique uses a macro-basis function (MBF) approach for rapid direct inversion of the MoM impedance matrix. To expedite the reduced matrix filling, we propose an extension of the steepest-descent multipole (SDM) expansion which remains numerically stable and efficient across a wide bandwidth. This broadband multipole-based approach is well-suited to quasi-planar problems and requires only the precomputation of each MBF’s complex patterns, resulting in low antenna-dependent preprocessing costs. The method also supports arrays with arbitrarily rotated antennas at low additional cost. A simulation of all embedded element patterns (EEPs) of irregular arrays of 256 complex log-periodic antennas completes in just 10 min per frequency point on a current laptop, with an additional minute per new layout.
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Gueuning, Q., de Lera Acedo, E., Brown Keith, A., Craeye, C., & O’Hara, O. (2025). A Broadband Multipole Method for Accelerated Mutual Coupling Analysis of Large Irregular Arrays Including Rotated Antennas. IEEE Transactions on Antennas and Propagation, 73(5), 3133-3145. https://doi.org/10.1109/TAP.2025.3564199 (Original work published 2025)