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Synthesis Procedure for Thinned Leaky-Wave-Based Arrays With Reduced Number of Elements

Abstract : 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
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Contributor : Laurent Jonchère Connect in order to contact the contributor
Submitted on : Monday, April 11, 2016 - 3:03:46 PM
Last modification on : Wednesday, April 27, 2022 - 4:29:00 AM



F. Scattone, M. Ettorre, Benjamin Fuchs, R. Sauleau, N. J. G Fonseca. Synthesis Procedure for Thinned Leaky-Wave-Based Arrays With Reduced Number of Elements. IEEE Transactions on Antennas and Propagation, 2016, 64 (2), pp.582--590. ⟨10.1109/TAP.2015.2509008⟩. ⟨hal-01300881⟩



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