Variable capacitance element
AssigneeMurata Manufacturing Co., Ltd.
InventorTakaaki Mizuno
Life of this patent
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Abstract
A variable capacitance element is provided that includes a plurality of resistance elements that form a path for applying a control voltage to the electrodes of a plurality of variable capacitance portions connected in series. These resistance elements include first distribution resistance elements, second distribution resistance elements, a first shared resistance element, and a second shared resistance element. Moreover, vertical sectional areas of the first shared resistance element and the second shared resistance element with respect to conducting directions thereof are larger than the vertical sectional areas of the first distribution resistance elements and the second distribution resistance elements with respect to conducting directions thereof.
Claims20
A variable capacitance element comprising:
- a plurality of variable capacitance portions connected in series with each other and each including a dielectric layer with a dielectric constant that is determined in accordance with electric field strength and a pair of electrodes that sandwich the dielectric layer;
- and
- a plurality of resistance elements that form a path for applying a control voltage to the respective electrodes of the plurality of variable capacitance portions,
- wherein the plurality of resistance elements are formed by resistance film patterns provided at a substrate;
- wherein the plurality of resistance elements include:
- first distribution resistance elements having first ends each connected to the electrodes of the plurality of variable capacitance portions, respectively, and second ends connected to a first common connection portion;
- second distribution resistance elements having first ends each connected to the electrodes of the plurality of variable capacitance portions, respectively, and second ends connected to a second common connection portion;
- a first shared resistance element having a first end connected to the first common connection portion and a second end connected to a first control voltage input terminal;
- and
- a second shared resistance element having a first end connected to the second common connection portion and a second end connected to a second control voltage input terminal, and
- wherein vertical sectional areas of the first and second shared resistance elements with respect to current conducting directions thereof are larger than respective vertical sectional areas of the first and second distribution resistance elements with respect to current conducting directions thereof.
A variable capacitance element comprising:
- a plurality of variable capacitors connected in series with each other;
- and
- a plurality of resistance elements providing a path to apply a control voltage to the plurality of variable capacitors, wherein the plurality of resistance elements are formed by resistance film patterns and include:
- a plurality of first distribution resistance elements connected between a first common connection node and respective pairs of the plurality of variable capacitors, respectively;
- a plurality of second distribution resistance elements connected between a second common connection node and respective pairs of the plurality of variable capacitors, respectively;
- a first shared resistance element connected between the first common connection node and a first control voltage input terminal;
- and
- a second shared resistance element connected between the second common connection node and a second control voltage input terminal, and
- wherein the first and second shared resistance elements each comprise line widths in a current conducting direction thereof that are larger than respective line widths of the plurality of first and second distribution resistance elements in the current conducting direction.
Dependencies are inferred from the claim text.