Ultra Low Side Lobe Level Synthesis with Particle Swarm Optimization for Symmetrical Non-uniform Linear Array Antennas
Ultra low side lobe level (ULSLL) array antennas have important applications in radar and communication systems, ULSLLs are usually realized with uniform linear array (ULA) or planar array antennas by excitation amplitude weighting, such as the current distributions resulted from Dolph-Chebyshev or Taylor synthesis. Lower SLL, however, implies lower aperture efficiency and larger excitation amplitude ratio (EAR), which makes the feed network more complicated and more difficult to fabricate; lower SLL is also very sensitive to the excitation amplitude/phase errors. In order to mitigate this difficulty, both the excitation amplitudes and the element positions are used for ULSLL synthesis, where the element positions act as extra freedoms for further SLL suppression. A symmetrical non-uniform linear array (SNULA) is proposed, the full information particle swarm optimization (FIPSO) based on the Von Neumann local neighborhood topology is adopted for ULSLL pattern synthesis, because it is effective for multi-dimensional, multi-local-minimum, non-linear complex problems and robust convergence. In the algorithm, the inertia weight is improved via the sigmoid limiting function; the boundary conditions are dealt with a randomized damp reflection. Two numerical examples are given, the first one is an 8-element -40 dB SLL array antenna, for comparison, a ULA with the same -aperture size, element number and peak SLL is synthesized by Dolph-Chebyshev method, the results obtained show that they have nearly identical main beam and equal side lobes, but the SNULA has lower EAR and higher aperture efficiency than those of the ULA. The second example is a 12-element -45 dB SLL array, similar rules are obtained.
Xiaomiao Zhang Kwai Man Luk Xue Bai Yinhang Wang Jinyang Li
National Key Laboratory of Antennas and Microwave Techniques,Xidian University Xian 710071,Shaanxi Department of Electronic Engineering,City University of Hong Kong 83 Tat Chee Avenue,Kowloon,Hong Ko
国际会议
Progress in Electromagnetics Research Symposium 2008(2008年电磁学研究新进展学术研讨会)(PIERS 2008)
杭州
英文
1-4
2008-03-24（万方平台首次上网日期，不代表论文的发表时间）