Using snake structure at the end of the planar monopole and adding load at proper position can decrease the size greatly and broaden the impedancebandwidth.
在平面单极子天线的末端采用蛇形结构，并在适当的位置加载，将大大减小天线尺寸，扩展阻抗带宽。
2
In foundation of the dual-layer structure, combining with capacitive coupled feed technology, the impedancebandwidth of the microstrip antenna has been further expanded;
在双层结构的基础上，结合电容耦合馈电技术，进一步扩展了微带天线的阻抗带宽；
3
Therefore, a single compact antenna that has an impedancebandwidth wide enough to cover the operating frequency bands of the multi-band wireless communication system is more desirable.