第三种天线是一种新型的宽槽天线。
已有工程实践表明，趾板不分缝，采取预留宽槽跳仓浇注可能是解决趾板裂缝的有效途径。
It is shown by engineering practice that if the plinth is not partitioned by slits the problem may be solved by wide trough left in advance.
然而，对一个宽槽来说，由于等离子区内边界层的变形，其蚀刻宽度会随着蚀刻深度的增加而增加。
However, for a wide trench, the width of etched profile will increase with the increase of its depth since the deformation of boundary layer in plasma.
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