第
Research Institute of Antennas & RF Techniques
School of Electronic & Information Engineering
第
Research Institute of Antennas & RF Techniques
Research Institute of Antennas & RF Techniques
Research Institute of Antennas & RF Techniques
Research Institute of Antennas & RF Techniques
实际应用中也经常用到非直线的导线振子，如V
Research Institute of Antennas & RF Techniques
Research Institute of Antennas & RF Techniques
【例型振子。

90D
Research Institute of Antennas & RF Techniques
Research Institute of Antennas & RF Techniques
=
Lλ
/2
Research Institute of Antennas & RF Techniques
Research Institute of Antennas & RF Techniques
Research Institute of Antennas & RF Techniques
Research Institute of Antennas & RF Techniques
Research Institute of Antennas & RF Techniques
Research Institute of Antennas & RF Techniques
Research Institute of Antennas & RF Techniques
Research Institute of Antennas & RF Techniques
，相当于双导线的特性阻抗为300欧姆。

Research Institute of Antennas & RF Techniques
Research Institute of Antennas & RF Techniques
俯视图端视图
Research Institute of Antennas & RF Techniques
Research Institute of Antennas & RF Techniques
7.3 八木-宇田天线
论八天天线原理的文章。

Research Institute of Antennas & RF Techniques
支撑杆
激励元
引向器
Research Institute of Antennas & RF Techniques
Research Institute of Antennas & RF Techniques
阵结构H面方向图
Research Institute of Antennas & RF Techniques
0.04λ，由数值方法可得H面的方向图，
阵结构H面方向图
寄生元比激励元长的一般趋势：出现了沿端射方向、且是由寄生元指向有源元的单一主瓣，这种
Research Institute of Antennas & RF Techniques
阵结构H面方向图
Research Institute of Antennas & RF Techniques
阵结构H面方向图E面方向图
Research Institute of Antennas & RF Techniques
Research Institute of Antennas & RF Techniques
Research Institute of Antennas & RF Techniques
Research Institute of Antennas & RF Techniques
Research Institute of Antennas & RF Techniques
八木天线设计曲线Research Institute of Antennas & RF Techniques
Research Institute of Antennas & RF Techniques
一个27元八木天线上的相对电流幅度
Research Institute of Antennas & RF Techniques
Research Institute of Antennas & RF Techniques
【例7-2】为电视12频道设计一个工作在205.25MHz 的12元八木天线。

使用直径1cm的阵元，且与金属
Research Institute of Antennas & RF Techniques
Research Institute of Antennas & RF Techniques
Research Institute of Antennas & RF Techniques
Research Institute of Antennas & RF Techniques
舰载八木天线
Research Institute of Antennas & RF Techniques
Research Institute of Antennas & RF Techniques
Research Institute of Antennas & RF Techniques。