WLAN频段印刷全向天线设计

Design of a printed omnidirectional antenna for WLAN frequency band

设计一种印刷串馈偶极子天线。采用平行双线作为馈线,印刷偶极子为辐射单元。馈电端采用四分之波长阻抗变换器进行阻抗匹配。天线单元采用互补结构,提高带宽,优化天线H面的不圆度。仿真结果表明,该天线电压驻波比小于2的带宽为20%,电压驻波比小于1.5的带宽为15%,在整个频段内水平面不圆度小于0.8dB,具有良好的全向性。实测结果优于仿真结果。

A series fed printed dipole antenna is designed.The parallel double line is used as the feeder,and the printed dipole is the radiation unit.The input end adopts the quarter-wave impedance converter for impedance matching.The antenna unit adopts complementary structure,which improves the bandwidth and optimizes the non-roundness of the antenna.The simulation results show that the proposed antenna can achieve 20% impendence bandwidth for VSWR2 and 13%impendence bandwidth for VSWR1.5.Horizontal non-roundness is less than 0.8 dB throughout the band and this shows good omni-directivity.Simulation result is fairly identical with the result measured in practice.