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The design of nonuniformly spaced linear array antennas using Particle Swarm Optimization method is considered. The purpose is to match a desired radiation pattern and improve the performance of these arrays in terms of sidelobe level. This performance criterion determines how well the system is suitable for wireless communication applications and interference reduction. Two approaches are considered: in the first, the design of element placement with the constraint of array length being imposed is performed. The second is based on element position perturbation starting from a uniform element distribution. Many examples are treated to show the effectiveness of the designs and the effect some other parameters might have on the overall performance of the array.

with a resonance around 9.2 GHz, simulation and test prove that could absorb electromagnetic wave, results of HFSS simulation show that have reduced RCS markedly with the largest scope of Ϫ6 dBm at a frequency around 9.0 GHz. Controllable metamaterial electromagnetic structure with microstruture will may be applied into stealth design and stealth technology for aircrafts, warships, and sateliites in the future.

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