如图,在平面直角坐标系\(xOy\)中,已知椭圆\( \dfrac {x^{2}}{a^{2}}+ \dfrac {y^{2}}{b^{2}}=1(a > b > 0)\)的右焦点为\(F\),\(P\)为右准线上一点\(.\)点\(Q\)在椭圆上,且\(FQ⊥FP\).
\((1)\)若椭圆的离心率为\( \dfrac {1}{2}\),短轴长为\(2 \sqrt {3}\).
\(①\)求椭圆的方程;
\(②\)若直线\(OQ\),\(PQ\)的斜率分别为\(k_{1}\),\(k_{2}\),求\(k_{1}⋅k_{2}\)的值.
\((2)\)若在\(x\)轴上方存在\(P\),\(Q\)两点,使\(O\),\(F\),\(P\),\(Q\)四点共圆,求椭圆离心率的取值范围.