We present the design, manufacturing, and testing of a 37-element array of corrugated feedhorns for Cosmic Microwave Background CMB) measurements between 140 and 170 GHz. The array was designed to be coupled to Kinetic Inductance Detector arrays, either directly (for total power measurements) or through an orthomode transducer (for polarization measurements). We manufactured the array in platelets by chemically etching aluminum plates of 0.3 mm and 0.4 mm thickness. The process is fast, low-cost, scalable, and yields high-performance antennas compared to other techniques in the same frequency range. Room temperature electromagnetic measurements show excellent repeatability with an average cross polarization level about − 20 dB, return loss about − 25 dB, first sidelobes below − 25 dB and far sidelobes below − 35 dB. Our results qualify this process as a valid candidate for state-of-the-art CMB experiments, where large detector arrays with high sensitivity and polarization purity are of paramount importance in the quest for the discovery of CMB polarization B-modes.

我们介绍了可在140至170 GHz之间进行宇宙微波背景CMB测量的37个元素的波纹形馈电喇叭阵列的设计，制造和测试。该阵列设计为直接（用于总功率测量）或通过正模传感器（用于极化测量）耦合到动力学电感检测器阵列。我们通过化学刻蚀0.3毫米和0.4毫米厚的铝板，在血小板中制造阵列。与相同频率范围内的其他技术相比，该过程快速，低成本，可扩展，并且可以生产高性能天线。室温电磁测量显示出出色的可重复性，平均交叉极化水平约为-20 dB，回波损耗约为-25 dB，第一旁瓣低于-25 dB，远旁瓣低于-35 dB。B模式。