Patent ID: 9728340
Date: 2017-08-08
CPC Classifications: B82Y,G06K,H01G,H01Q,Y10S

Claim:
1. A variable capacitance capacitor element comprising: a supporting substrate; a first electrode layer provided on the supporting substrate; a second electrode layer provided opposite to the first electrode layer; and a first thin film dielectric layer positioned between the first and second electrode layers, wherein a main component of the first thin film dielectric layer is represented by a composition formula Ba wherein the first thin film dielectric layer has a thickness from 30 nm to 150 nm, and wherein the thickness of the first thin film dielectric layer is between 30 nm and 150 nm such that, upon application of a DC bias voltage of 3 Volts, an electric field strength in the variable capacitance capacitor element is 1.0 MV/cm or lower, and wherein, when the DC bias voltage is continuously applied to the variable capacitance capacitor element for a predetermined amount of time, a variation rate of capacitance of the variable capacitance capacitor element is 4% or lower due to the thickness of the first thin film dielectric layer being between 30 nm and 150 nm and the composition formula of the first thin film dielectric layer being represented by Ba