# RF Ground (Reflections?)

I'm trying to understand how someone can ground an RF signal (especially relating to microstrip lines). I think I'm missing something... Since the impedance of ground is supposed to be $0\Omega$, wouldn't all frequencies reflect off it? I suppose when they reflect off it, that means that the voltage at that spot has to be $0$V, which I guess implies an impedance of $0\Omega$. ($Z=\frac{V}{I}=\frac{0}{I}=0\Omega$) Is this how it works?

Thanks.