A broadband Quasi-Yagi-Uda antenna array with high gain is proposed. The antenna has a form of printed circuit board, and the printed dipole is fed by balanced microstrip line. In order to save space, the feeding line and radiator are designed to be integrated. To enhance antenna gain and bandwidth, parasitic elements and a piece of dielectric slab are introduced in front of the active dipole. In order to further enhance antenna gain, binary array is composed of antenna elements, and a feeding network with balanced wideband and equal power distribution is designed. The whole antenna array with feeding network are printed on the two sides of the FR4 epoxy resin lami-na, and it is modeled and simulated by electromagnetic simulation software CST Microwave Studio? . The antenna array is manufactured according to the simulation results. And the antenna is measured in microwave anechoic chamber. The results indicate that the reflection coefficient within band of (4.4-7.0) GHz is below - 10 dB, the relative bandwidth is 45.6% and the average gain in the whole band is 6.2 dB, which obtain the expected effect.%提出了一种高增益的宽带准八木天线阵列.天线为印刷电路板的形式,通过平衡微带线给印刷对称振子馈电.为节省空间,将馈线与反射器进行了一体化的设计.为提高天线单元的增益和带宽,在有源振子前方引入了寄生振子和一段介质板.为进一步提高天线增益,将天线单元组成二元阵,设计了一个宽带平衡与等功率分配的馈电网络.整个天线阵连同馈电网络印刷在一块FR4环氧板的两侧,使用电磁仿真软件CST Microwave Studio(R)进行建模与仿真分析.根据仿真结果制作了天线阵列,在微波暗室内进行测试.结果表明,天线在(4.4-7.0) GHz的频带内反射系数小于-10 dB,相对带宽为45.6％,在整个工作频段内平均增益为6.2 dBi,达到了预期效果.
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