毫米波段非谐振型低副瓣波导缝隙天线的改进型设计方法(英文)

Improved design for low-sidelobe non-resonant slotted waveguide antenna

在毫米波段,为了更精确、快速地设计出非谐振型低副瓣波导缝隙天线,提出了一种改进型解析方法,具体方法为在传统的斯蒂文生公式引入一个修正因子。该修正因子可大幅度提高波导宽边上的径向缝隙偏移量的解析计算精度。一般情况下,传统斯蒂文生公式仅适用于长宽比大于10∶1的窄缝设计。而此方法则可用于低副瓣、长宽比接近4∶1的宽缝波导缝隙天线的快速设计。对修正公式进行了理论分析,并使用改进型公式,设计加工出了一个工作频率为60 GHz的波导缝隙原型天线,实测增益和副瓣电平分别为14.8 dB和-25 dB。仿真结果以及测试数据吻合良好,证实了此改进型方法的有效性。

For fast design of millimeter-wave non-resonant slotted waveguide antennas( SWAs) with more accuracy,an improved analytical method is presented by introducing a modified factor into the traditional Stevenson's formula. The modified factor can greatly improve analytical calculation accuracy of slot displacement of longitudinal shunt slots cut in the broad face of a waveguide. Generally,the traditional Stevenson's formula is valid for only narrowslots of a length-to-width ratio of 10 ∶ 1. However,the proposed method allows for fast design of millimeterwave SWAs of very low-sidelobe levels and wide slots of an approximately 4 ∶ 1 length-to-width ratio. A theoretical explanation of the modification was provided. With the improved method,a prototype of non-resonant SWAs operating in 60 GHz band was designed and fabricated. The measured gain and sidelobe level are 14. 8 dB and- 25 dB.Good agreement between the simulation results and measured data indicate the effectiveness of this improved method.