平面小型化双陷波天线设计

摘要

本文设计了一种具有双频陷波特性的小型化平面单极子天线．该天线由开有π型与W型缝隙的辐射贴片和一对L型分支组成．L型分支的作用是能够激励额外谐振，从而增加阻抗带宽，π型和W型缝隙能够实现双陷波特性．该天线可以实现超过130％的带宽（2．77～13．62 GHz），最大的特点是具有12×18×1．6 mm3的小型化尺寸．最终的仿真和测试结果显示其在整个超宽带频段内具有良好的陷波特性、增益和全向辐射特性．%A novel miniaturized planar monopole antenna for ultra-wideband (UWB )applications with dual band-notched function is proposed in this paper.The proposed antenna consists of an ordinary square radiating patch with a π-shaped slot,a modified W-shaped slit and a pair of L-shaped branches.By adding the pair of L-shaped branches,additional resonances are excited and wider impedance bandwidth can be produced.To generate dual band-notched characteristics,aπ-shaped slot in the radiating patch surrounded by a modified W-shaped slit is etched.The antenna provides a wide usable frac-tional bandwidth of more than 130% (2. 77-13. 62GHz).In addition,the designed antenna has a small size of 12 ×18 × 1. 6mm3 while showing the band-rejection performance,covering all the 3. 5/5. 5-GHz WiMAX,4-GHz C-bands and 5. 2/5. 8-GHz WLAN.Simulated and measured results show good band-notched functions,stable gain and nearly omnidirectional radiation patterns of the proposed antenna over the entire UWB frequency.