中远程一体化车载雷达线阵天线的设计

该文提出了一种新型的宽带近接耦合毫米波微带阵列天线,并将其作为77~81 GHz中远程汽车雷达的专用天线。该天线阵列由微带线及一系列矩形和多边形辐射单元组成。辐射单元在微带线两侧呈周期性分布,间隔约为引导波长的1/2。为增强激励耦合引入了矩形和多边形辐射单元,在拓宽阻抗带宽的同时,抑制了带外频率。不同辐射单元和矩形反射槽相匹配,达到波束赋形的效果,实现了平肩膀辐射方向图。通过调整辐射单元与微带线的间隔,控制辐射单元的归一化电阻。在工作频率为77~81 GHz时,阵列天线的增益超过14 dBi,阻抗带宽达到7.47%(76.5~82.4 GHz)。对实物样本进行加工及性能检测,测试表明,仿真与实测数据基本一致。

Design of Medium and Long-Range Integrated Linear Array Antenna for Vehicle-Borne Radar

In this study, a novel wideband near-coupled millimeter-wave microstrip array antenna is proposed,

specifically designed for 77-81 GHz medium and long-range automotive radar applications.The antenna array comprises

a microstrip line and series of rectangular and polygonal radiation units.These units are periodically distributed

on both sides of the microstrip line and separated by approximately half of the guiding wavelength.The rectangular

and polygonal radiation elements are designed to enhance excitation coupling.In addition, the impedance bandwidth

is widened and out-of-band frequency is suppressed.Different radiation elements and rectangular reflection

slots are matched to achieve the beam shaping effect and realize a flat shoulder radiation pattern.The normalized resistance

of the radiation unit is controlled by adjusting the interval between the radiation unit and microstrip line.At

the operating frequency range of 77-81 GHz, the gain of the array antenna exceeds 14 dBi, and the impedance bandwidth

reaches 7.47%(76.5-82.4 GHz).An actual example was processed and tested, and the accuracy of the design

was confirmed by simulations and actual measurements.