将平面等角螺旋天线投影到半球面和部分球面上，得到半球面螺旋天线和部分球面螺旋天线两种新型球面螺旋天线。
Two novel spherical helical antennas are designed by projecting the planar equiangular spiral antenna onto the surfaces of hemisphere and partial sphere.
已知以原点为心，以a为半径的球面，也可以说是半球面或是球面的一部分。
Let's say that I gave you a sphere of radius a centered at the origin, or maybe just half of that sphere or some portion of it.
总是可以找到球面的一部分以它为界。
I can always find a portion of the sphere that's bounded by it.
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