Phased Array Scattering-Cross-Section Reduction Based on Hybrid Scattering Cancellation Technique

A novel hybrid scattering cancellation approach to reduce scattering cross section (SCS) of phased arrays is proposed in this paper, which not only makes use of cancellations between antenna mode and structural mode scattering fields, but also achieves cancellation of scattering field from different array elements. An 8 x 8 planar microstrip phased array is constructed to validate the concept. By optimizing element loads utilizing particle swarm optimization algorithm, the proposed phased array realizes very impressive SCS reductions of 8.3 dB and 20 dB with respect to its conventional counterpart and the equal-sized metallic plate, respectively, with a balanced radiation performance.