volume | PIER Journals

Abstract

This study addresses the synthesis of shaped beams for linear antenna arrays under dynamic range ratio constraints on excitation amplitudes. When hardware limitations restrict excitation freedom, conventional methods suffer significant sidelobe degradation. The proposed approach jointly optimizes the element positions and excitations through iterative second-order cone programming. A distinguishing feature is the error-aware constraint formulation, which incorporates linearization error bounds, ensuring actual pattern compliance with the beam mask at each iteration. Adaptive trust-region control based on actual-to-predicted improvement ratios ensures robust convergence. Numerical experiments with flat-top and cosecant-squared beams demonstrated 7-12 dB sidelobe improvement over excitation-only methods under strict amplitude constraints. Compared with particle swarm optimization, the proposed method achieves superior sidelobe suppression while being orders of magnitude faster.

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Dr. Le Trong Phuoc Bui