A kind of diffraction element modulating phase information by LC space light modulator to get a zoom Fresnellens, as well as the using of said element to optical imaging system, is introduced.
The one-dimensional Fresnel zone phase correcting principle can be applied in a cylindrical surface to constructed a new type of point source feeding lens antenna.
在圆柱面上进行一维菲涅尔区相位修正结构设计，可以构成一类新型的点源馈电透镜天线。
3
A binary Fresnellens with 8 phase steps can be manufactured with micro-optical element fabricating technology and three times of alignment according to Fresnel diffraction theory.