A novel reconfigurable fractal ground loaded monopole antenna with p-i-n diode switching and metamaterial as superstrate for gain and bandwidth enhancement is reported. The proposed structure is a CPW-fed monopole antenna with a Minkowski fractal square ring loaded in the ground plane. The integration of p-i-n diode helps in achieving frequency reconfigurability. The antenna with diode OFF operates at 1.4 GHz, 2.1 GHz, 3.7 GHz, 7.6 GHz and 8.9 GHz. But, with diode switched ON, the resonating frequencies shift to 1.4 GHz, 3.4 GHz, 5.45 GHz, 7.86 GHz and 9.52 GHz respectively. When a metamaterial superstrate is placed on top of the monopole radiator, the respective −10 dB impedance bandwidth enhancement of 1.4%, 28%, 18%, 8.3% and 6.3% is obtained. Furthermore, the respective peak gain of 8.37 dB, 8.67 dB, 5.26 dB, 16.09 dB and 21.58 dB are obtained that justifies the shift of operating bands. The simulation results agree well over the experimental findings.

报道了一种新颖的可重构的分形地面负载单极天线，其具有pin二极管开关和超材料作为增益和带宽增强的上层。所提出的结构是由CPW馈电的单极天线，在地面上装有Minkowski分形方环。pin二极管的集成有助于实现频率可重新配置。二极管关闭的天线工作在1.4 GHz，2.1 GHz，3.7 GHz，7.6 GHz和8.9 GHz。但是，在二极管导通的情况下，谐振频率分别变为1.4 GHz，3.4 GHz，5.45 GHz，7.86 GHz和9.52 GHz。当将超材料上覆板放置在单极辐射器的顶部时，可分别获得1.4％，28％，18％，8.3％和6.3％的-10 dB阻抗带宽增强。此外，各自的峰值增益分别为8.37 dB，8.67 dB，5.26 dB，16.09 dB和21。获得58 dB，证明工作频带的偏移是合理的。仿真结果与实验结果吻合良好。