beam steering

Array-fed Fabry-Perot cavity antenna for two-dimensional beam steering

We propose a simple phased-array design based on a Fabry-Perot cavity antenna for the generation of a highly-directive pencil beam steerable along two directions in 3-D space. Each array element generates an element pattern in the far-field obtained through the excitation of a dominant cylindrical TM leaky wave inside the cavity. Hence, the resulting conical pattern is combined with the array factor of a N × N square or circular arrangement of ideal vertical electric dipoles.

Multi-fed 2-D leaky-wave antennas. Beam steering and polarization reconfigurability

We describe the possibility of achieving enhanced radiation performance introducing multiple sources within a two-dimensional structure supporting one or more cylindrical leaky-waves. The device is planar and made by a grounded dielectric slab loaded on top by a periodic arrangement of metallic strips or patches and it is fed by an array of simple, fully integrated, dipoles.

2-D beam scanning with cylindrical-leaky-wave-enhanced phased arrays

Directive pencil beams scannable in both elevation and azimuth are obtained through a planar phased array placed inside a Fabry-Perot cavity. The key element of the proposed approach is the exploitation of a conical element pattern (EP) with high directivity in elevation, obtained through the excitation of a dominant, weakly attenuated cylindrical TM leaky wave of azimuthal order n = 0 by means of a simple coaxial probe. Then, a highly reduced number N of such sources are arranged to form a phased array radiating directive pencil beams.

2-D planar leaky-wave antenna with fixed frequency beam steering through broadside

A two-dimensional leaky-wave antenna fed by an array of fully integrated sources and able to provide fixed-frequency continuous beam steering through broadside is presented in this contribution. The structure is constituted by a 'bull-eye' leaky-wave antenna fed by a proper arrangement of four surface-wave launchers, whose excitation coefficients are selected to control the beam pointing angle around broadside.

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