Character Analysis and Realization of Small Microwave Calibration Source Based on Cone Array

2022 IEEE 5th International Conference on Electronics Technology (ICET) Pub Date : 2022-05-13 DOI:10.1109/icet55676.2022.9824690

Yida Wang, Jiexin Wang, Kai Zhang, Jie Liu, Zhenlin Sun, Siqi Li, Wanyi Liu, Feng Yan

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Abstract

During the use of radiometer, antenna calibration is an indispensable step. In this paper, the calibration source is designed for human body temperature measurement calibration. So, the calibration source should have the close to 1 emissivity in 12-18GHz and have good temperature uniformity. To achieve the above two requirements, a small and high-precision and temperature controllable blackbody calibration device is designed. In this paper, the electromagnetic scattering characteristics and temperature distribution uniformity of blackbody calibration source is analyzed. The cone model design is determined by simulation. During the simulation, it is found that increasing the coating thickness does not significantly improve the emissivity under small-scale and large elevation. Finally, a calibration source is realized. Under the working frequency band, the emissivity is higher than 0.998. And the maximum surface temperature distribution error is only $2 ^{\circ}\mathrm{C}$ in $100 ^{\circ}\mathrm{C}$ situations.

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基于锥形阵列的小型微波定标源特性分析与实现

在辐射计的使用过程中，天线校准是必不可少的步骤。本文设计了用于人体体温测量标定的标定源。因此，校准源应在12-18GHz范围内具有接近1的发射率，并具有良好的温度均匀性。为实现上述两个要求，设计了小型高精度温控黑体标定装置。本文分析了黑体标定源的电磁散射特性和温度分布均匀性。通过仿真确定锥体模型的设计。在模拟过程中发现，在小尺度和大标高下，增加涂层厚度并不能显著提高发射率。最后，实现了一个标定源。在工作频带下，发射率大于0.998。在$100 ^{\circ}\ mathm {C}$的情况下，表面温度分布误差最大仅为$2 ^{\circ}\ mathm {C}$。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2022 IEEE 5th International Conference on Electronics Technology (ICET)

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