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设计了一种共面波导馈电的蝶形缝隙天线.采用CST电磁仿真软件详细分析了天线结构参数(蝶形缝隙的长度L、宽度W和介质基片的厚度h)对天线性能的影响.优化后的天线阻抗带宽为770MHz(S11<-10dB),增益为1.2dB,并具有良好的辐射方向.另外,采用CST计算了天线的雷达散射截面(RCS),结果表明:天线RCS的最大值出现在谐振频率上,为10.67dBsm,且主极化平面上的RCS值远大于交叉极化平面上的值.最后计算并分析了加载电阻条件下该天线的雷达散射截面,结果表明:适当加载电阻可以缩减天线的RCS.
A butterfly antenna with coplanar waveguide feedthrough is designed and its influence on antenna performance is analyzed in detail by using CST electromagnetic simulation software, which includes antenna structure parameters (the length L of the slit, the width W and the thickness of the dielectric substrate h). The optimized antenna impedance bandwidth is 770MHz (S11 <-10dB) with a gain of 1.2dB and a good radiation direction.In addition, the radar cross section (RCS) of antenna is calculated by CST. The results show that the maximum value of antenna RCS Appears at the resonant frequency, which is 10.67dBsm, and the RCS value on the main polarization plane is much larger than that on the cross-polarization plane.Finally, the radar cross section of the antenna under the loading resistance condition is calculated and analyzed. The results show that: Resistors reduce the RCS of the antenna.