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本文给出了近似求解二维周斯渐变形状吸收体构成的微波辐射计外部定标负载辐射特性的方法．计算结果与数值方法、实验测量进行了比较．当结构周斯小于0．75倍波长，即D＜0．75λo时近似算法有良好的精度．
In this paper, a method of approximating the external calibration radiation characteristics of a microwave radiometer, which is composed of two-dimensional Zeiss gradient absorbers, is given. Calculation results and numerical methods, experimental measurements were compared. The approximation algorithm has good accuracy when the structure is less than 0.75 times the wavelength of the week, that is, D <0.75λo.