Abstract
The performance of various mutual coupling estimation and compensation methods is quantified and compared for wideband operation. Their main limitations and the required procedures to estimate the coupling matrix are outlined. It is determined that only the full-wave method is accurate at all frequencies. The performance tradeoffs associated with the other methods are described. General guidelines based on the electrical size and separation of the array elements are formulated for each method. The results can be valuable for both wideband and narrowband receiving antenna arrays.
Highlights
Mutual coupling in antenna arrays is a subject that has received considerable attention in recent years
Various mutual coupling compensation methods were compared over a wide range of frequencies
The opencircuit voltage method is only accurate when the elements are electrically small and was shown to yield a performance approaching that of the full-wave method when the array elements can be approximated by a single segment
Summary
Mutual coupling in antenna arrays is a subject that has received considerable attention in recent years. To mitigate the effects of mutual coupling, several methods have been proposed in the literature. These methods generally attempt to estimate the coupling matrix describing the mutual coupling. The coupling matrix is subsequently used by the signal processor to compensate for the effects of mutual coupling. A comprehensive review of mutual coupling compensation (MCC) methods available in the scientific literature was done in [1]. These methods typically use different approaches to estimate the coupling matrix. Published work that originally introduced the different MCC methods [2,3,4,5] and subsequent published work (see [1])
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