| abstract |
A tunable capacitor that introduces significantly less loss, if any, costs less and is smaller than previously available. A bias electrode (14) is coupled to a FE material (16). The capacitor electrodes (21, 24) are electro-magnetically coupled to the FE material, such that the capacitor electrodes and the bias electrode are not touching. Only non-conductive material is in the gap defined by the capacitor electrodes. The bias electrode (14) is used to apply a variable DC voltage to the FE material (16). A capacitor electrode (21, 24) serves as a DC ground for producing a variable DC field between the bias electrode (14) and the capacitor electrodes (21, 24). |