一种新型S波段宽带圆形贴片天线的设计

摘要

A novel broadband circular microstrip antenna working at S-band is designed and simulated with HFSS software.The antenna adopts two layers of substrates: teflon and air.In order to implement the compensation of the inductive reactance caused by the long coaxial probe, a lumped capactor is added at the top of the probe and then the coupled feed of radiation patch is conducted.An arc slot is made on the circular patch to generate another resonance frequency for the further enhancement of bandwidth.The simulation results show that the impedence BW of the antenna reaches 38％ (VSWR＜2) and within the range of band the radiation pattern of antenna almost keeps the same.%采用HFSS11电磁场仿真软件设计和仿真了一种工作于S波段的新型宽带圆形微带贴片天线.天线采用聚四氟乙烯和空气两层介质,通过同轴探针顶部加栽圆形金属电客片来对辐射贴片进行耦合馈电,由此补偿探针引起的电感;同时,在圆形贴片上开圆弧形缝隙,以生成第二个谐振点,从而进一步增大带宽.结果表明,天线的阻抗带宽达到了38%(VSWR<2),并且在带宽内天线的辐射方向图基本保持稳定.