基于均匀介质球透镜的二维扫描天线

2D-Scan Antenna Based on Homogeneous Spherical Lens

在球透镜仅实现一维扫描的基础上,通过在另一维上平行放置多层馈源的方式,实现了二维同时扫描。基于坐标变换和GO/PO方法推导了馈源偏移量和波束指向角之间的关系式。该天线由一个均匀介质球透镜和多层平面馈源天线组成。通过同一层上的TSA(渐变缝隙天线)单元之间的切换实现水平面的扫描,而通过不同层上TSA单元之间的切换实现垂直面的扫描。作为在毫米波段的一个应用,研制了一个Ka波段用8×2的TSA单元阵馈电的天线实物。实测结果表明它可以在水平面和垂直面分别达到128°和30°的覆盖。

Spherical lens generalizely can only be used to multiple beams in one dimension previously.Multilayer feed antennas placed parallelly in another dimension,scanning in two dimensions is realized.The relationship between displacement of feed antenna and scan angle is analyzed based on the coordinate transformation approach and by using a combined GO/PO method.The antenna is composed of a homogenous spherical lens and multiple layer planar feed antennas.The beam scanning in azimuth and elevation can be achieved by switching the TSA feed antennas in the same layer and different feeding layers respectively.For millimeter-wave application,a Ka-band lens antenna with 8 × 2 feed arrays has been fabricated.Measurements show scan coverage of 128° in azimuth and 30° in elevation is achieved.