There are all kinds of antennas used in EMC test such as biconical antennas, logperiodicantenna, helical antenna, ridged horn antenna and etc.
用于电磁兼容试验的宽频带天线有很多类型，如双锥天线、对数周期天线、螺旋天线、喇叭天线等等。
2
The logperiodic dipole antenna(LPDA) is used as an object of study.
主要研究了对数周期偶极子天线。
3
The major work of this thesis is to design and make a good LPDA(log-periodic dipole antenna)as the feed of the ten-meter parabolic reflectors at the Yunnan Observatory.