介质微扰对微带天线性能影响的研究

Performance Research of Rectangular Microstrip Antennas about Medium Perturbation

本文论述了在微带天线辐射缝隙附近,局部的介质基板对天线频率特性的影响。首先建立了一个以空气为介质,工作频率为2.45GHz的矩形微带贴片天线,并给出了天线的具体尺寸,在此基础上,在天线基板两辐射缝隙处增加了相对介电常数为εr的一小段矩形支撑介质,借助于微带天线腔模理论模型和麦克斯韦方程式对改变后的模型进行分析,得出了增加支撑介质后天线谐振频率与原谐振频率的关系,并利用HFSS仿真工具验证了公式在一定范围内是正确的。

Antenna frequency is affected by the substrate. The frequency perturbation caused by the part substrate seted at the radiate fringe is presented in this paper. A 2.45GHz, air substrate,microstrip antenna is designed and the dimensions of the antenna is given. A relative permittivity εr,short substrate is seted to brace the microstrip patch at the radiate fringe. A cavity method is used to get the frequency relation between the antenna with air substrate and short substrate at the radiate fringe.