Sarkis, Rémi
[UCL]
(eng)
Adaptive antenna arrays are widely used for different operations, mainly for Direction Finding and Imaging applications. Nowadays, the compactness of these arrays is of great importance, which leads to a decrease on inter distances and an increase on the mutual coupling level. The main objective of this thesis is to study and compensate the coupling effect on different array applications. First, the mutual coupling is investigated in T-shape planar arrays for the localization of civilians, in search and rescue mission, through the answers from their mobile handsets. Then we proposed a diversely polarized circular array of eight electrically connected 3D Vivaldi antennas. A direct link is established between the number of spherical waves modes needed for the representation of the radiation patterns and the precision of the angle of arrival and the polarization estimation. At the same time, we show how the simulation time of these purely metallic antennas can be reduced using the Method-of-Moments together with the Array Scanning Method (ASM). Finally, the analysis of the mutual coupling remains a challenge when very large arrays of antennas are contemplated. The adoption of the Array Scanning Method current distributions as Macro Basis Functions is demonstrated to be the physical and logical solution. The design procedure for a dual polarized focal plane array of 71 compact thick Vivaldi metal-only antennas, suitable for astronomical applications, is presented.
Bibliographic reference |
Sarkis, Rémi. Antenna arrays for direction of arrival estimation and imaging : from mutual coupling analysis to real-world design. Prom. : Craeye, Christophe |
Permanent URL |
http://hdl.handle.net/2078.1/105009 |