Contribution à la conception de réflecteurs adaptés aux antennes large bande de faible épaisseur

Abstract : Antennas dedicated to electronic warfare (EW), operate on bandwidth higher than a decade (ratio 10 between the high and low frequencies), with the low frequency close to one hundred MHz. Antennas usually used in the field of EW are independent frequency antennas, which are placed above an absorber cavity. However, the thickness of the cavity is important regarding the antenna lower operating frequency. This complicates the integration of these antennas on small carriers where the volume is limited and the mass is a critical parameter. In order to develop new more efficient antenna systems dedicated to the EW, it is necessary to operate a technological break of current solutions. This break consists of replacing the cavity absorber employing heavy, expensive and no reproducible materials by innovative solutions as those proposed by metamaterials such as artificial magnetic conductor (AMC). In my work, we selected two antennas, an Archimedean spiral antenna and a sinuous antenna. An analysis of the electromagnetic near field of the antennas has been proposed and partially validated by an innovative measurement. Thanks to this analysis, it is possible to give the variation distribution of the active area of the antenna close to this one, in order to design a reflector placed very close to the antenna. We have exposed and validated the different types of the reflectors that can be associated with this type of antenna, whether it is a perfect electric conductor (PEC) or a perfect magnetic conductor (PMC). The results proved that a wideband bidirectional antenna place above a PEC reflector has a maximal band of interest (MBI) of 5:1, in this bandwidth the broadside gain of the
Keywords : Metamaterials
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Christopher Djoma. Contribution à la conception de réflecteurs adaptés aux antennes large bande de faible épaisseur. Electronique. Télécom ParisTech, 2013. Français. ⟨NNT : 2013ENST0083⟩. ⟨tel-01153357⟩

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