受到美国空军资助的加州马里布hrl实验室的研究人员正在致力于天线的全息阻抗表面研究，以此为飞机提供更好的空气动力性能。
Air Force-funded researchers at HRL Laboratories in Malibu, Calif., are working on holographic impedance surfaces for antennas that will give aircraft improved aerodynamics.
空气层的阻抗非常的大，测不出差别。
This is because the resistance is so great that a layer of air makes no appreciable difference.
本文中空气入口边界采用辐射阻抗边界，优于传统的将入口边界压力当成零的软压力边界。
In the BEM model, the radiation impedance boundary condition at air intake surface is used and the results demonstrate that it is superior to the traditional pressure release boundary.
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