X/Ku双频微带振子天线设计

Design of an X/Ku Dual-Band Microstrip Dipole Antenna

本文设计了一种具有较宽波束的双频微带振子天线,此天线可以工作在X频段(3.36GHz～4.62GHz)及Ku频段(12.64GHz～15.67GHz)。天线采用微带振子天线的变形形式进行辐射,可以实现较宽的波束覆盖。根据非频变天线的特性,在X/Ku两个频段内采用渐变形式轮廓增加单个频段内的带宽使得X频段Ku波段的相对带宽分别达到31.6%和21.33%,天线的双频特性通过开槽增加电流路径实现。两个同轴线端口对天线进行馈电,可以实现正交双线极化及圆极化。天顶方向双线极化交叉极化电平约为-16dB,主要工作频带内圆极化轴比小于5dB。利用软件HFSS对设计的模型进行仿真分析,并用矢量网络分析仪和比较法测试了天线的驻波特性和方向图特性,结果很好的验证了理论分析。

A dual-frequency microstrip dipole antenna with a wide beam is designed in this paper,which works in both X-band(3.36GHz^4.62GHz) and Ku-band(12.64GHz^15.67GHz). The antenna uses the deformation of the microstrip antenna element to radiate and can achieve a wider beam coverage. According to the characteristics of non-frequency-variable antennas, the use of a gradual changed contour in the X/Ku frequency bands to increase the bandwidth within a single frequency band allows the relative bandwidth to reach 31.6% and 21.33%, respectively. The dual-frequency characteristics of the antenna are achieved by slotting the current path. Two coaxial ports feed the antenna, enabling orthogonal dual-line polarization and circular polarization. The zenith direction bipolar polarization cross polarization level is about-16 dB, and the circular polarization axis ratio in the main operating frequency band is less than 5d B. The software HFSS was used to simulate the design model and the theoretical analysis is verified by test results.