Planar Archimedean antenna can work in a very wide band, while the wideband matching network is difficult to be implemented, especially in adding a reflecting cavity to get a unidirectional radiation.

• 平面阿基米德螺旋天线具有极宽的工作频带,然而其匹配平衡电路的宽频带实现则较难,尤其是在加反射腔以使其单向辐射时。