# Can you increase capacitance of capacitor by sandwiching a high dielectric constant material between two strong insulators?

My very limited research into dielectric materials has suggested that the higher the dielectric constant of a material, the less insulating it is. So why not just have some material with extremely high permittivity sandwiched in between two extremely strong insulators. Shouldn't that result in a greater increase in the value of absolute permittivity relative to the increase in distance (in regards to a parallel plate capacitor), hence resulting in a greater overall capacitance as given by the equation:

C = ε(A/d)

Also is it true that conductive materials are considered to have an infinite dielectric constant? If so, why is it not used in the way I suggested above?

I believe there is a flaw in my understanding of what's happening and would appreciate some clarification.

Adding more layers to the dielectric stack, high dielectric constant or not, will not increase the capacitance. Recall the formula for the equivalent capacitance of series-connected capacitors: $$C_{eq}^{-1} = C_1^{-1} + C_2^{-1} + ...$$ which, for capacitors of equal area, can also be written as $$c_{eq}^{-1} = t_1/\epsilon_1 + t_2/\epsilon_2 + ...$$ where $$c_{eq}$$ denotes the equivalent capacitance per unit area and $$t_i$$ denotes the thickness of dielectric $$i$$.