Filter and filter module
AssigneeMurata Manufacturing Co., Ltd.
InventorMotoki Ozasa
Life of this patent
Estimating the term…
Abstract
A filter module includes an antenna connection terminal, filter elements, and inductors. The filter elements are connected to an antenna connection terminal. A first inductor is connected between the antenna connection terminal and the filter elements. A second inductor is connected between a transmission line, which connects the first inductor and the filter elements, and a ground reference potential. The filter elements are on an insulating multilayer substrate. The inductors include electrodes on the multilayer substrate. Inductor electrodes of the first inductor and central cavities of the inductor electrodes are at positions different from other electrodes inside the multilayer substrate.
Claims18
A filter module comprising:
- a first input and output terminal, a second input and output terminal, and a third input and output terminal;
- a first filter element that is connected between the first input and output terminal and the second input and output terminal;
- a second filter element that is connected between the first input and output terminal and the third input and output terminal;
- a first inductor that is connected between the first input and output terminal and the first filter element;
- and
- a second inductor that is connected between an end portion of the first inductor and a ground reference potential;
- wherein
- the first inductor and the second inductor define at least a portion of a matching circuit;
- the first filter element is mounted on a multilayer substrate in which a plurality of insulator layers are laminated;
- the first inductor and the second inductor include electrodes on the multilayer substrate;
- a first inductor electrode of the first inductor and a second inductor electrode of the second inductor have individual winding shapes, respectively, when the multilayer substrate is viewed in plan view;
- the first inductor electrode is at a position different from other electrodes on insulator layers adjacent in a lamination direction with respect to an insulator layer on which the first inductor electrode is located in plan view;
- and
- the other electrodes are connected to the ground reference potential.
A filter module comprising:
- a first input and output terminal, a second input and output terminal, and a third input and output terminal;
- a first filter element that is connected between the first input and output terminal and the second input and output terminal;
- a second filter element that is connected between the first input and output terminal and the third input and output terminal;
- a first inductor that is connected between the first input and output terminal and the first filter element;
- and
- a second inductor that is connected between an end portion of the first inductor and a ground reference potential;
- wherein
- the first inductor and the second inductor define at least a portion of a matching circuit;
- the first filter element is mounted on a multilayer substrate in which a plurality of insulator layers are laminated;
- the first inductor and the second inductor include electrodes on the multilayer substrate;
- a first inductor electrode of the first inductor and a second inductor electrode of the second inductor have individual winding shapes, respectively, when the multilayer substrate is viewed in plan view;
- the second inductor electrode includes a portion parallel or substantially parallel to sides of other electrodes, which are on the same layer as the second inductor electrode of the multilayer substrate and adjacent to the second inductor electrode, on a side of the second inductor electrode;
- and
- the second inductor electrode and at least a portion of a cavity surrounded by the second inductor electrode are at positions that overlap the other electrodes in plan view.
Dependencies are inferred from the claim text.