Étude et conception d'une antenne compacte ultra large-bande à diversité de polarisation. Application à la radiogoniométrie.

Abstract : Radio direction finding (DF) allows for the measurement of the direction of arrival of incoming electromagnetic signals. Its main applications include spectrum monitoring and electronic warfare. DF antennas and arrays are subject to new problematics (bandwidth, compactness and polarization diversity) while DF algorithms have kept on improving. Previous works have initiated the design of such antennas and arrays. This work aims at designing an antenna with reduced dimensions for the VHF and UHF frequency bands and with a polarization diversity. This antenna shall then be integrated in a functional DF array. For this purpose, a planar antenna has been designed and measured in the 500-3000 MHz frequency band. Its final dimensions are 150mm x 150mm (λ/4 x λ/4). This antenna has then been integrated in the final DF array whose accuracy on the same frequency band is of the order of 2° for a final size of 260mm (diameter) x 150mm (height), that is λ/2,3 x λ/4. This study has also allowed for the design of a low-profile absorber (with a height of 25mm, that is λ/24 at its lowest frequency of operation). An increase of 10dB in the front to back ratio of the proposed antenna has been enabled by this absorber on its whole frequency band.
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Submitted on : Friday, April 14, 2017 - 10:26:43 AM
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  • HAL Id : tel-01508424, version 1

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Nina Lorho. Étude et conception d'une antenne compacte ultra large-bande à diversité de polarisation. Application à la radiogoniométrie.. Electronique. UNIVERSITE DE NANTES, 2017. Français. ⟨tel-01508424⟩

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