Two novel spherical helical antennas are designed by projecting the planar equiangular spiral antenna onto the surfaces of hemisphere and partial sphere.
Spherical or oval-shaped curve, we have a dish antenna.
球形或椭圆形曲线，我们有一个碟式天线。
3
Luneberg lens antenna is a spherical layered medium lens antenna, and its main feature is its capability of focusing the incident wave to a point on the spherical surface.