For microwave diffraction imaging, we use the WKB approximation to estimate the total field in the dielectric object.
对于介质目标微波衍射成象，本文引入了WKB近似来模拟目标内部总场。
The method can make it more approximation to Helmholtz equation and it's answers include WKB approximation.
该法可以更加近似赫姆霍兹方程，且它的解中包含WKB的近似值。
The course also examines approximation methods: WKB method, variational principle, and perturbation theory.
同时，本课程也解释了几种常用的近似方法：WKB方法、变分原理、以及微扰理论。
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