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Article Dans Une Revue Comptes Rendus. Physique Année : 2017

Theoretical and Practical Limits of Superdirective Antenna Arrays

Résumé

Some applications as Wireless Power Transfer (WPT) require compact and directive antennas. However, Electrically Small Antennas (ESAs) have low effi-ciencies and quasi-isotropic radiation patterns. Superdirective ESA arrays can be an interesting solution to cope with both constraints (the compactness and the directivity). In this paper, the theoretical and practical limits of super-directive antennas will be presented. These limits can be summarized by the directivity sensitivity toward the excitation coefficients changes and the radiation efficiency decrement as the inter-element decreases. The need for negative resistances is also a practical limit for transforming these arrays to parasitic ones. The necessary trade-offs between the antenna total dimensions (the number of the elements and the inter-element distance) and the attainable-directivity and-efficiency are also analyzed throughout this paper.
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hal-01409757 , version 1 (06-12-2016)

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Abdullah Haskou, Ala Sharaiha, Sylvain Collardey. Theoretical and Practical Limits of Superdirective Antenna Arrays. Comptes Rendus. Physique, 2017, 18 (2), pp.118-124. ⟨10.1016/j.crhy.2016.11.003⟩. ⟨hal-01409757⟩
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