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提出一种工作于2.4GHz(圆极化)和5.8GHz(线极化)的双频微带天线,由共面带状线(CPS)馈电。在菱形环中内嵌小方环实现双频工作,菱形环上槽口实现圆极化特性,背面加反射板以提高天线增益。为了实测天线性能和应用于不平衡馈电方式,还设计了CPS至微带线的巴伦。实测结果与仿真结果比较吻合,在2.4GHz与5.8GHz的S11<-10dB工作带宽分别为33.3%和17.4%,增益分别达到9.05dBi和6.59dBi,2.4GHz频点3dB轴比带宽为15.8%。该天线频带宽、增益高、结构简单、易于集成,可用于无线通信和微波输能系统的整流天线中。
A dual band microstrip antenna operating at 2.4 GHz (circularly polarized) and 5.8 GHz (linearly polarized) is proposed and fed by a coplanar stripline (CPS). In the diamond ring embedded in a small square ring to achieve dual-band work, diamond ring notch to achieve circular polarization characteristics, the back of the reflector to increase the antenna gain. In order to measure the antenna performance and applied to the unbalanced feeding method, a CPS-to-microstrip balun was also designed. The measured results are in good agreement with the simulation results. The operating bandwidth of S11 <-10dB at 2.4GHz and 5.8GHz is 33.3% and 17.4%, respectively, and the gains are 9.05dBi and 6.59dBi respectively. The 3dB axis bandwidth at 2.4GHz is 15.8%. The antenna has the advantages of wide frequency band, high gain, simple structure and easy integration, and can be used in the rectification antenna of wireless communication and microwave energy transmission system.