This research investigates the effect of reducing vibration of a plate by using new type passive piezoelectric absorbers. The thin plate is simply supported and subjected to an impact force at its center. Two piezoelectric absorbers are attached to both sides of the plate. A standard piezoelectric absorber is made of a piece of piezoelectric material connected to passive electric components. Each new passive absorber consists of an additional capacitor which is out of phase with the equivalent capacitor in the piezoelectric material. The equations of motion of the composite plate are derived by applying Hamilton's principle. The equations of circuits are also obtained. Combining these two sets of equations and using Galerkin's method can give the responses of plate vibration. Numerical results show the new absorbers can give more effective broadband reduction in the plate displacement than standard passive absorbers. Discussions focus on the characteristics of the new absorbers.