부산대학교 도서관

To achieve the perfect stealth of targets, the ultra-wideband RCS (Radar Cross Section) reduction technique is in urgent demand nowadays. The introduction of metasurface brings the advantages of design flexibility and low profile. However, metal-pattern-layer metasurface usually has narrow frequency characteristics. To widen the bandwidth and avoid shortcomings of higher manufacturing cost and lower reliability, the present research designs an ultra-wideband RCS reduction metasurface with pure metal-pattern layer. Based on the impedance matching and polarization conversion, absorbing bandwidth is gradually widened by improving the design of the metal-pattern layer. Finally, 85% (7.64-19GHz) and 104% (7.2-22.8GHz) relative bandwidths for the periodic unit and array are realized for RCS reduction, respectively. The maximum absorptivity reaches 0.9996 for the metasurface unit. The maximum RCS reduction of 22.28dBsm and the average one of 10.2dBsm are realized for the metasurface array. The design has some application potential for targets with RCS reduction requirement.