一种带宽扩展的小型化微带天线

Miniaturization and Bandwidth Extension of Microstrip Antenna

设计了一种中心频率位于S波段、结构简单的单层微带贴片天线。一方面,通过在贴片表面加载变形的Sierpinski分形槽,使天线的谐振频率降低了287 MHz,实现了贴片尺寸的缩减;另一方面,在天线接地面上加载地面缺损结构(DG S),通过优化DGS在接地面上的布局,当天线工作在2.4 GH z时,RVSW(电压驻波比)≤2.0的绝对带宽有219MHz,比不加DG S的同类天线提高了3倍多。综合应用上面两种技术后,加载DG S的小型化天线的绝对带宽也有174 MHz,达到了缩减天线尺寸和带宽扩展的双重效果。

A simple microstrip antenna in S band is designed. To reduce its size, a quasi Sierpinski fractal slot is applied on the patch, and the resonant frequency is reduced to 287 MHz. Then the DGS （Defected ground structure） is reduced. By optimizing the position of DGS, the absolute bandwidth of conventional antennas with DGS can b without DGS, when the ant of DGS is 174 MHz. Theref e expanded to 219 MHz with Rvsw≤2.0, which is 3 times more than those enna works at 2.4 GHz. And the absolute bandwidth of antennas by virtue ore, the scheme has double effects ： size reduction and bandwidth extension.