Study of corrugated Winston horns
Study of corrugated Winston horns
复制标题
波纹温斯顿喇叭的研究
作者：
B. Maffei;E. Gleeson;J. Murphy;G. Pisano
光滑壁温斯顿喇叭已被广泛用作辐射热测量仪器的光收集器。在没有波导的多模操作中使用，光束形状是礼帽状的，并且一个简单的方程足以定义其半高宽。另一方面，众所周知，波纹馈电喇叭比光滑壁喇叭更有效，并且在极化特性和旁瓣抑制方面表现得更好。本文介绍了一种波纹状温斯顿馈源喇叭的研究，这种馈源喇叭可用于未来的天文仪器，专门用于宇宙微波背景（CMB）偏振测量。我们表明，在这种情况下，低交叉极化可以预期在单模操作，它们可以产生较低的旁瓣水平相比，圆锥形或轮廓形状。
Smooth walled Winston horns have been extensively used as light collectors for bolometric instruments. Used in multimoded operation without a waveguide, the beam shape is top-hat like and a simple equation is sufficient to define its Full Width Half Max. On the other hand, it is well known that corrugated feed horns are more efficient than smooth walled horns and much better well behaved with respect to polarization characteristics and sidelobe rejection. We present in this paper a study of corrugated Winston feed horns which could be used for future Astronomical instruments devoted to Cosmic Microwave Background (CMB) polarization measurements. We show that in this case low cross-polarization can be expected in single moded operation and that they could produce lower sidelobes levels compared to conical or profile shapes.