具有缺陷地结构的双频微带天线设计

采用哑铃型缺陷地结构(DGS)设计了一种新型的双频微带天线,天线的主要辐射单元为一对对称的L形贴片,L形贴片所包围的中间区域敷以圆弧形贴片和一个竖向的矩形连接带并将二者融合为一个整体,实现了天线的双频特性。引入哑铃型的DGS结构,并给出了DGS结构的等效电路图,通过改变DGS结构的尺寸改变了等效电路的电感和电容从而改变了天线的频率特性。测试结果表明:天线能够同时工作在低频4.37 GHz和高频6.08 GHz两个频段,满足微波C波段所要求的频率范围。低频和高频的S₁₁分别为-29.76 dB、-11.99 dB,天线实测S₁₁结果和仿真结果基本吻合。

Design of Dual Band Microstrip Antenna with DGS

A new type of dual-band microstrip antenna was proposed using a dumbbell-type defect ground structure(DGS), the main radiating element of the antenna was a pair of symmetrical L-shaped patch, the middle area surrounded by L-shaped patch was covered with a circular arc patch and a vertical rectangular connecting strip, and the two were integrated into a whole to realize the dual-band characteristics of the antenna. Dumbbell-type DGS structure was introduced and the equivalent circuit was given. Because the equivalent inductance and capacitance changed with the size of the DGS structure, so the frequency characteristics of the antenna was changed. The measured results show that the antenna can work at both the low frequency of 4.37 GHz and the high frequency of 6.08 GHz simultaneously, which can meet the frequency range required in C-band. The parameters of S11 are-29.76 dB and-11.99 dB at the low and high frequency respectively. The measured S11 result of the antenna has basically agreement with the simulation result.