A concentric ring array with uniform element excitations and conjugate-matching phases can synthesize a near-field flat-top beam by balancing the increasing and decreasing field trends of rings with different radii.
On the near-field shaping and focusing capability of a radial line slot array,
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Quasi-Closed-Form Driven Near-Field Flat-Top Beamfocusing with Concentric Circular Vertical Polarized Dipole Array For Large Intelligent Surface Applications
A concentric ring array with uniform element excitations and conjugate-matching phases can synthesize a near-field flat-top beam by balancing the increasing and decreasing field trends of rings with different radii.