The Coddington is essentially a sphere with a slot cut in it to allow an aperture smaller than the pupil of the eye. 科丁顿放大镜实质上是一个球，球面上开槽，使得孔径小于眼的瞳孔。
The radiation and impedance characteristic of microstrip antenna may be influenced by cutting slots on the groundplane with applications to widening the frequency band. 接地板开槽可以改变微带天线的辐射特性及阻抗特性，在微带贴片天线的频带展宽中已有所应用。
