interesting but try better way, circle is simple, you cant set it up like you want
try
1) make a solid
2) take a mask tool in elipse shape
3) from center of composition make a circle shape by dragging mouse and holding shift to make it perfekt circle and holding ctrl to center it on point where you started dragging
4) do it again to make second mask but smaller/bigger like you want
5) choose that solid a and by pressing twice M you open mask setting on it one mask leave on ADD option and second switch to SUBTRACT now you make a circle within them
advantage of this is you can set your wave like you want feather edges or thickness, then keyframe masks like you want to perform shockwave, even you can do that on some background and wave got texture from it(like i made it on grid BG) and much more
here ex.
other setting are followed by you like orientation in space, color correction and etc.