Abstract: A tunable component such as a tunable BST (Barium Strontium Titanate) capacitor is added inside the antenna structure, and the input impedance of the antenna is tuned by tuning this tunable component, rather than adding a multiple-component impedance matching network at the feed point of the antenna outside the antenna as in conventional solutions. With this structure, the input impedance of the antenna may be adjusted very precisely and efficiently.

Abstract: Ferroelectric thin film devices including a passivation structure to reduce or control a leakage path between two electrodes and along an interface between a ferroelectric thin film layer and a passivation layer are described. Methods for fabricating such devices are also disclosed. The passivation structure includes a first passivation layer that includes an opening exposing a portion of the ferroelectric thin film layer allowing a second passivation layer to contact the thin film layer through the opening. In an exemplary embodiment, the opening is a rectangular ring surrounding an active region of a capacitor. In another exemplary embodiment, the second passivation layer also contacts the second electrode, a portion of which is also exposed through the opening. In another exemplary embodiment, current flows along the interface between the thin film layer and the passivation layer in an integrated resistor.