| 2. | Monopole antennas have been used in many applications , especially in hf antennas , due to their inherent advantage like simple structure , easy to machine and mount , and omnidirectional radiation pattern 单极子天线以其结构简单、易于加工、易于安装及全向辐射等诸多优点得到了广泛的应用, hf天线普遍使用了单极子天线的形式。 |