硅基薄片太赫兹波纹喇叭的设计、不确定度分析与测量
Design, Uncertainty Analysis and Measurement of a Silicon-based Platelet THz Corrugated Horn
摘要：
平面波纹喇叭是一种很有前途的技术，可扩展到一个大的波纹喇叭阵列。介绍了一种170-320 GHz宽带低副瓣（<-30 dB）波纹喇叭的设计、制作、测量和不确定度分析。我们还首次提出了一种精确而通用的方法来分析薄片的轴向错位。它是基于模式匹配（MM）的方法与离轴圆波导不连续性的封闭形式的解决方案，通过使用格拉夫加法定理的贝塞尔函数。采用蒙特卡罗方法对制作过程中引入的不确定性进行了定量分析。分析表明，波纹喇叭的交叉极化随轴向失调而显著恶化。这很好地解释了太赫兹波片波纹喇叭交叉极化的设计值与实测值之间的差异。该方法可用于确定其他太赫兹波纹喇叭所需的制造公差，并评估波纹喇叭对天文观测的影响。
英文摘要：
Platelets corrugated horn is a promising technology for their scalability to a large corrugated horn array. In this paper, we present the design, fabrication, measurement and uncertainty analysis of a wideband 170-320 GHz platelet corrugated horn that features with low sidelobe across the band (<-30 dB). We also propose an accurate and universal method to analyze the axial misalignment of the platelets for the first time. It is based on the mode matching (MM) method with a closed-form solution to off-axis circular waveguide discontinuities obtained by using Graf addition theorem for the Bessel functions. The uncertainties introduced in the fabrication have been quantitatively analyzed using the Monte Carlo method. The analysis shows the cross-polarization of the corrugated horn degrades significantly with the axial misalignment. It well explains the discrepancy between the designed and the measured cross-polarization of platelets corrugated horn fabricated in THz band. The method can be used to determine the fabrication tolerance needed for other THz corrugated horns and evaluate the impact of the corrugated horn for astronomical observations.
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