Abstract: It is an object of the invention to provide a variable capacitor constituted such that, even when an external control voltage is applied, a stable dielectric constant of the dielectric layer can be obtained. A variable capacitor constituted such that a dielectric layer whose dielectric constant is changed by the application of an external voltage is held between an upper electrode layer and a lower electrode layer, wherein a plurality of capacitance-producing regions a, b are connected to each other.

Abstract: A thin film capacitor with small electrode resistance and great Q-value which comprises a small number of thin films that are deposited successively is disclosed. It is effective for miniaturization and high density packaging of a device and for preventing poor characteristics and degradation of reliability. A plurality of lower electrodes 2 are provided on a supporting substrate 1, which are spaced apart from each other in a high frequency signal propagation direction P. Two upper electrodes 5 spaced apart from each other in the high frequency signal propagation direction P are provided on one of the plurality of the lower electrodes 2 through a thin film dielectric layer 4, by which two capacitance elements are formed. The upper electrodes 5 are connected together by an extraction electrode 8 so that the two capacitance elements are connected in series.

Abstract: A thin film capacitor with small electrode resistance and great Q-value which comprises a small number of thin films that are deposited successively is disclosed. It is effective for miniaturization and high density packaging of a device and for preventing poor characteristics and degradation of reliability. A plurality of lower electrodes 2 are provided on a supporting substrate 1, which are spaced apart from each other in a high frequency signal propagation direction P. Two upper electrodes 5 spaced apart from each other in the high frequency signal propagation direction P are provided on one of the plurality of the lower electrodes 2 through a thin film dielectric layer 4, by which two capacitance elements are formed. The upper electrodes 5 are connected together by an extraction electrode 8 so that the two capacitance elements are connected in series.

Abstract: It is an object of the invention to provide a variable capacitor constituted such that, even when an external control voltage is applied, a stable dielectric constant of the dielectric layer can be obtained. A variable capacitor constituted such that a dielectric layer whose dielectric constant is changed by the application of an external voltage is held between an upper electrode layer and a lower electrode layer, wherein a plurality of capacitance-producing regions a, b are connected to each other.

Abstract: It is an object of the invention to provide a variable capacitor constituted such that, even when an external control voltage is applied, a stable dielectric constant of the dielectric layer can be obtained. A variable capacitor constituted such that a dielectric layer whose dielectric constant is changed by the application of an external voltage is held between an upper electrode layer and a lower electrode layer, wherein a plurality of capacitance-producing regions a, b are connected to each other.

Abstract: It is an object of the invention to provide a variable capacitor constituted such that, even when an external control voltage is applied, a stable dielectric constant of the dielectric layer can be obtained. A variable capacitor constituted such that a dielectric layer whose dielectric constant is changed by the application of an external voltage is held between an upper electrode layer and a lower electrode layer, wherein a plurality of capacitance-producing regions a, b are connected to each other.