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Theses

Réseaux multi-octave d'antennes spirales connectées

Abstract : One of the usual problems associated with wideband arrays is having the highest frequency of operation limited by the appearance of grating lobes, associated with the periodicity in the spacing between elements of the array. Another issue is the working frequency of the element of the array. The lowest frequency of operation is in general related to the size of the element. In this thesis a Concentric Ring Array of Connecting Spirals has been developed. The connections between spirals of opposite polarizations reduces the reflection coefficient at lower frequencies. The concentric rings topology had the radius and relative rotations of each ring optimized using Genetic Algorithms to minimize the RSLL at higher frequencies. The addition of a size constraint in the optimization procedure kept the array compact. The optimized array operates from 1 to 6.9 GHz. The design was then updated using the WAVES technique to include a scaled down copy in its center, extending the bandwidth of the array up to 13 GHz. Moreover, we proposed a new design for the array of connected spirals which consists of arranging spirals in a uniform array and connecting the arms of the neighboring spirals. Simulations indicate that the design can have an arbitrarily large bandwidth depending on the finiteness of the array. A prototype has been built and measured to validate the concept.
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https://tel.archives-ouvertes.fr/tel-01989820
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Submitted on : Tuesday, January 22, 2019 - 3:44:20 PM
Last modification on : Tuesday, September 29, 2020 - 4:27:33 AM

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  • HAL Id : tel-01989820, version 1

Citation

Pedro Mendes Ruiz. Réseaux multi-octave d'antennes spirales connectées. Autre. Université Paris Saclay (COmUE), 2018. Français. ⟨NNT : 2018SACLC075⟩. ⟨tel-01989820⟩

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