Ensuring the sharp roll-off property of a filtering antenna in many applications is regarded as one of the highest priorities and requires the designers' full concentration. This work devotes itself to challenge the remarkably roll-off characteristics by searching for the best fragment-type patterns etched on a ultrawideband monopole radiator without using any other auxiliary components or resonant structures. The etch pattern is obtained technically by coping with the multi-objective optimization issue based on the initial band notch generated by joint slits. Guide rules for presetting the two slits are also proposed. The results of roll-off criterion (ROC) = 0.83 for notching the WLAN band ranging from 5.15 to 5.84 GHz and ROC = 0.91 for notching a broad band ranging from 4.8 to 6.35 GHz are presented in detail.

中文翻译：

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用碎片型蚀刻图案挑战非常尖锐的滚降带槽口

确保滤波天线在许多应用中的急剧滚降特性被视为最高优先级之一，需要设计人员全神贯注。这项工作致力于在不使用任何其他辅助组件或谐振结构的情况下，通过寻找蚀刻在超宽带单极辐射器上的最佳碎片型图案来挑战显着的滚降特性。蚀刻图案是通过处理基于联合狭缝产生的初始带槽口的多目标优化问题在技术上获得的。还提出了预设两个狭缝的指导规则。详细介绍了滚降标准 (ROC) = 0.83 用于对 5.15 至 5.84 GHz 范围内的 WLAN 频带进行陷波，ROC = 0.91 对 4.8 至 6.35 GHz 范围内的宽带进行陷波的结果。