Abstract
The conformal metasurface for wide-band RCS reduction of cylindrical target is designed and characterized. By adjusting the size of basic unit cells, the different reflection phases of the unit cell are obtained in wide frequency band. The selection and distribution of the basic unit cells are carried out simultaneously to achieve wide-band RCS reduction by using hybrid array pattern synthesis (APS) and particle swarm optimization (PSO) algorithm. Based on the natural diffusion feature in the ϕ direction of the cylinder, Six basic unit cells within square patch are selected to produce the 1D metasurface to reduce the scattering in the z direction only. Through the precise design of the unit cell, larger than 180°reflection phase coverage of these cells over 8.01–17.06GHz are achieved. When a cylindrical is covered with such 1D metasurface based on square patch unit cell, the 10 dB RCS reduction can be obtained over 8.36GHz-17.14GHz by comparing to a same size PEC cylinder.
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