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设计了一种平面宽带平衡准八木天线,该天线由双面印刷的电偶极子和反射器以及单面印刷的两个引向器组成。所用介质基板的相对介电常数为2.2,其尺寸为29.5 mm×27.0 mm×1.0 mm。利用电磁仿真软件IE3D对该天线的参数进行了仿真优化,得到了其阻抗带宽、增益、辐射方向图等特性。仿真结果表明:该天线的阻抗带宽从4.1 GHz到10.8 GHz(S11<–10 dB),相对带宽可达到89.9%,增益平均值为5.08 dB,增益的波动范围为3.73 dB到6.28 dB,此外该天线具有稳定的定向的辐射方向图。
A planar broadband balanced quasi-Yagi antenna was designed that consists of a double-sided printed dipole and reflector and two directors printed on one side. The dielectric substrate used has a relative permittivity of 2.2 and a size of 29.5 mm × 27.0 mm × 1.0 mm. The electromagnetic simulation software IE3D was used to optimize the parameters of the antenna, and the impedance bandwidth, gain and radiation pattern were obtained. The simulation results show that the impedance bandwidth of the antenna is from 4.1 GHz to 10.8 GHz (S11 <-10 dB), the relative bandwidth is up to 89.9%, the average gain is 5.08 dB, and the fluctuation range of the gain is from 3.73 dB to 6.28 dB. The antenna has a stable directional radiation pattern.