%0 Journal Article
%T Synthesis Procedure for Thinned Leaky-Wave-Based Arrays With Reduced Number of Elements
%+ Institut d'Électronique et des Technologies du numéRique (IETR)
%A Scattone, F.
%A Ettorre, M.
%A Fuchs, Benjamin
%A Sauleau, R.
%A Fonseca, N. J. G
%Z Brittany Region
%Z ESA
%< avec comité de lecture
%@ 0018-926X
%J IEEE Transactions on Antennas and Propagation
%I Institute of Electrical and Electronics Engineers
%V 64
%N 2
%P 582--590
%8 2016-02
%D 2016
%R 10.1109/TAP.2015.2509008
%K Antenna arrays
%K antenna radiation patterns
%K Apertures
%K array elements
%K convex minimization
%K embedded element patterns
%K fast Green function spectral approach
%K grating lobes
%K Gratings
%K ground plane
%K iterative methods
%K iterative optimization procedure
%K leaky wave antennas
%K Leaky-wave antennas
%K Leaky-wave antennas (LWAs)
%K leaky-wave modes
%K leaky-wave-thinned array
%K minimisation
%K Minimization
%K mutual coupling
%K Optimization
%K radiated field
%K reduced number of elements
%K thinned array antennas
%K thinned leaky-wave-based arrays
%K waveguide antenna arrays
%K waveguide apertures
%Z Engineering Sciences [physics]/Electronics
%Z Computer Science [cs]/Networking and Internet Architecture [cs.NI]Journal articles
%X We proposed a synthesis method to design thinned leaky-wave-based arrays. The array elements are small waveguide apertures opened on a ground plane. A superstrate (impedance sheet, dielectric slab, etc.) is placed above the array. The array elements excite leaky-wave modes between the ground plane and the superstrate, enhancing the aperture efficiency of the final antenna. An iterative optimization procedure based on a convex l1 minimization is used to reduce the number of array elements, maintaining the radiated field within a predefined mask. All the embedded element patterns are evaluated for each source through a fast Green's function spectral approach, taking into account the effects of the mutual coupling during the optimization procedure. The use of a superstrate provides array structures with a reduced number of elements and enhanced aperture efficiency with respect to configurations without superstrate. The level of the grating lobes is also controlled during the optimization. A parametric study is performed to understand the capabilities of the leaky-wave-thinned array varying the reflectivity of the superstrate. As an example, an array of 18 elements working over a 7% fractional bandwidth is synthesized, providing a reduction by a factor of 4 in the number of elements when compared to a configuration with the same requirements, but without superstrate
%G English
%L hal-01300881
%U https://univ-rennes.hal.science/hal-01300881
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