Abstract: The effect of loop shape of the planar loop dipoles to the broad-band input impedance characteristics has been studied by use of an optimization method, the result indicates that the circle is the optimum shape. An example of constructing a parasitic array antenna with broad-band impedance characteristics by use of such an optimum shape dipole is given.

Key words: planar loop dipoles, optimization of input impedance of antenna, broad-band parasitic array antennas

摘要： 用优化方法研究了回路形状对于平面回路型偶极子宽频带阻抗特性的影响，发现圆形为最佳回路形状，给出了用此种偶极子构成具有宽频带阻抗特性的寄生阵天线的实例。

关键词: 平面回路型偶极子, 天线输入阻抗优化, 宽频带寄生阵天线