Techniques de Maîtrise des Phénomènes de Couplage dans les Antennes Réseaux Imprimées à Balayage Electronique : Application à la Réduction des Directions Aveugles

Abstract : When radiating elements are located close to one another, as it is the case in electronically phased array antennas, parasitic electromagnetic interferences occur between them. The impact of these coupling mechanisms depends to a large extent on the scanning angle of the array, but is usually harmful, since it alters the radiating properties and the active input impedance of the sources. The compactness objectives and radioelectric performances required for airborne radars can lead to structures that support and foster these parasitic couplings, in the form of surface or space waves. In some cases, mutual coupling can even result in the impossibility for the array to radiate in certain directions and at certain frequencies. This phenomenon, referred to as scan blindness, significantly reduces the operating scan volume of a radar system. In that respect, the control of coupling mechanisms between radiating elements is a major issue when developing an array antenna and although the research that deals with this subject is no longer in its infancy, it is always pending for new and innovating solutions to master these phenomena. In this thesis, different solutions enabling to minimize the effect of couplings in phased arrays are investigated. The presented research revolves around the challenge of limiting scan blindness consequences without modifying the initial mesh of the array antenna.
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Aurélien Ayissi Manga. Techniques de Maîtrise des Phénomènes de Couplage dans les Antennes Réseaux Imprimées à Balayage Electronique : Application à la Réduction des Directions Aveugles. Réseaux et télécommunications [cs.NI]. INSA de Rennes; Thales (Firme), 2018. Français. ⟨NNT : 2018ISAR0033⟩. ⟨tel-02143042⟩

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