哑铃形EBG结构微带天线的设计与仿真

Design and Simulation of Microstrip Antenna with EBG Structure of Etching Dumbbell Shape Structure

以哑铃形EBG结构为研究载体,通过数值计算,对其带隙特性进行了研究.结果表明:在一定范围内哑铃形结构矩形边长增加、狭缝长度增加、介质基板厚度增加、介电常数增加,带隙中心频率呈下降趋势,而狭缝宽度增加,带隙中心频率呈上升趋势;同时表明介质基板厚度、介电常数增加,禁带宽度上升,狭缝宽度增加,禁带宽度下降.依据所得结论,设计了一Ku频段的微带贴片天线,与无EBG结构的同尺寸天线相比,其单元天线增益提高了1.68 dB,方向图特性得到了很好的改善.

A microstrip antenna based on the EBG structure of etching dumbbell shape is investigated. The results indicate that in the specific range the band gap, center frequency has a decrease tendency with the increase in rectangle side length, the length of the dumbbell-shaped structure slit, as well as the increase of dielectric substrate thickness and the dielectric constant. However, the increase in the slit width will cause the increase of the band gap center frequency. At the same time, the inhibitive gap rises with increasing the dielectric substrate thickness and the dielectric constant value. The increase in the slit width results in the drop of the inhibitive gap. According to the above mentioned results, a novel Ku-band microstrip patch antenna is designed, which has a 1.68 dB higher gain than the one with the same size without EBG, and the pattern characteristic is improved also.