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Etude d'antennes large bande miniatures à spirale d'Archimède

Abstract : The goal of the present thesis is to study a wideband miniaturized antenna compatible with specifications set by Thales enterprise. Thus, this antenna needs to achieve a frequency band superior to a decade i.e. a ratio of 10 between high and low operation frequency. A state of the art of wideband antennas has leaded us to choose an Archimedean spiral as our main radiating element. After performing a state of the art of low band broadening techniques, our researches leaded us on the study of the contribution of a dielectric substrate on the electrical performances of spirals. A deepen study of the spiral associated with different configurations of dielectric substrates has permitted us to notice a low band broadening of operation linked to the effective permittivity of the environment. However, some degradation of electrical performances proportional to the effective permittivity can be noted. Along with the incorporation of criteria allowing us to quantify the positive and negative contributions of a dielectric substrate, a geometrical modification consisting of lowering the metal ratio of the spiral is studied. The goal is to reduce degradation in the upper frequency band while maintaining a satisfying low band broadening.
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Submitted on : Monday, September 14, 2020 - 4:20:23 PM
Last modification on : Wednesday, September 16, 2020 - 9:57:30 AM


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  • HAL Id : tel-02938043, version 1


Mickaël Fray. Etude d'antennes large bande miniatures à spirale d'Archimède. Electronique. Université de Bretagne occidentale - Brest, 2019. Français. ⟨NNT : 2019BRES0043⟩. ⟨tel-02938043⟩



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