Abstract: An analytical formula for radiation field of dipole arrays based on equivalent circuit theory was verified in previous works.We extend this concept to field scattered by dipole arrays.Based on analytical formulas,a method is proposed to synthesize desired radiation and scattering patterns of dipole arrays simultaneously by optimizing element positions with PSO.To verify accuracy and effectiveness of the method,a linear dipole array is designed to obtain low side lobe level radiation and scattering patterns.Good agreement between results with the proposed method and FEKO validates accuracy of the method.Maximum sidelobe level of radiation and scattering patterns at operating frequency are both reduced by optimization.Furthermore,maximum levels of MRCS patterns in-band at threat angles are also considerably reduced.

Key words: antenna arrays, dipole antennas, mutual coupling effects, side lobe suppression, radar cross section reduction(RCSR)