A wide-band smooth-walled feedhorn with low cross polarization for millimeter astronomy
A wide-band smooth-walled feedhorn with low cross polarization for millimeter astronomy
复制标题
用于毫米天文学的低交叉极化宽带光滑壁馈源喇叭
DOI：
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
Edward J. Wollack
中科院分区：
文献类型：
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作者：
L. Zeng;C. Bennett;D. Chuss;Edward J. Wollack
我们提出了一个光滑的壁喇叭天线与交叉极化和反射功率低于-30分贝在整个30%的带宽。制作了一个喇叭天线样机，并验证了其宽带、低交叉极化的性能。喇叭天线具有圆形孔径并且朝向输入波导接口单调变窄。这使得它可以通过使用一套定制工具逐步铣削轮廓来制造。这在需要大量平面阵列形式的馈源的应用中特别有用。这些应用包括毫米波段的天文照相机，这些照相机需要大型探测器阵列，以便将来提高测绘速度和灵敏度。具体来说，大型喇叭天线阵列与测量宇宙微波背景的偏振以寻找膨胀的微弱信号的问题非常匹配，因为它们提供了良好的波束控制，必要的灵敏度以及与低噪声测辐射热探测器的兼容性。
We present a smooth-walled feedhorn with cross polarization and reflected power lower than -30 dB across the entire 30% bandwidth. A prototype feedhorn has been fabricated, and the wide-band, low-cross polarization performance has been demonstrated. The feedhorn has a circular aperture and monotonically narrows towards an input waveguide interface. This allows it to be manufactured by progressively milling the profile using a set of custom tools. This is especially useful in applications where a large number of feeds are desired in a planar array format. Such applications include astronomical cameras in millimeter waveband that require large arrays of detectors for future increases in mapping speed and sensitivity. Specifically, large arrays of feedhorns are well-matched to the problem of measuring the polarization of the cosmic microwave background to search for the faint signature of inflation, as they provide good beam control, the requisite sensitivity, and compatibility with low-noise bolometric detectors.