Electronic component

• US 8,896,394 B2
• Filed: 08/19/2013
• Issued: 11/25/2014
• Est. Priority Date: 03/18/2011
• Status: Active Grant

• Current Assignee: Murata Manufacturing Co Limited
• Original Assignee: Murata Manufacturing Co Limited
• Inventors: Taniguchi, Tetsuo
• Primary Examiner(s): Lee, Benny
• Assistant Examiner(s): PATEL, RAKESH BHASKARBHAI
• Application Number:
  US13/969,766
• Publication Number:
  US 20130335159A1
• Time in Patent Office: 463 Days
• Field of Search: 333/25, 333/185
• US Class Current: 333/185
• CPC Class Codes: H03H 2001/0085 Multilayer, e.g. LTCC, HTCC, green sheets inside PCB filters H05K
• CPC Class Codes: H03H 7/0115 comprising only inductors and capacitors H03H7/075, H03H7/09, H03H7/12, H03H7/13 take precedence
• CPC Class Codes: H03H 7/09 Filters comprising mutual inductance
• CPC Class Codes: H03H 7/1775 Parallel LC in shunt or branch path H03H7/1791 takes precedence
• CPC Class Codes: H03H 7/42 Networks for transforming balanced signals into unbalanced signals and vice versa, e.g. baluns

Abstract

An electronic component includes a laminate including a plurality of insulator layers and a mounting surface. The mounting surface is defined by the outer edges of the plurality of insulator layers that are continuously joined together. An LC parallel resonator is embedded in the laminate, and includes a coil and a capacitor. An unbalanced signal is inputted to the LC parallel resonator. A coil is embedded in the laminate. The coil is electromagnetically coupled to the coil, and outputs balanced signals. Outer electrodes are provided on the mounting surface, and are grounded. A ground conductor layer of the capacitor is connected to an outer electrode by extending to the mounting surface.

Claims

1. An electronic component comprising:

a laminate that includes a plurality of insulator layers that are laminated, the laminate including a mounting surface configured to be disposed closest to and extend in parallel with a surface of a board on which the laminate is mounted so as to electrically connect the electrical component with the board, the mounting surface being defined by outer edges of the plurality of insulator layers that are continuously joined together;

an LC parallel resonator to which an unbalanced signal is inputted, the LC parallel resonator being embedded in the laminate and including a first coil and a first capacitor;

a second coil that is embedded in the laminate, the second coil being electromagnetically coupled to the first coil and outputting balanced signals; and

a first outer electrode which is provided on the mounting surface, and which is grounded;

wherein

a ground conductor layer of the first capacitor is connected to the first outer electrode by extending to the mounting surface; and

the first coil includes;

a first coil conductor layer that is provided on one of the plurality of insulator layers;

a first via hole conductor that is connected to one end of the first coil conductor layer; and

a second via hole conductor that is connected to another end of the first coil conductor layer.

2. The electronic component according to claim 1, wherein the first outer electrode has a cross shape.

3. The electronic component according to claim 2, wherein a plurality of additional outer electrodes are arranged such that the first outer electrode is between the plurality of additional outer electrodes.

4. The electronic component according to claim 3, wherein the plurality of additional outer electrodes each have a rectangular or substantially rectangular shape.

5. The electronic component according to claim 1, wherein the first outer electrode includes a first straight-line portion and a second straight-line portion, the first straight-line portion and the second straight-line portion cross each other at an intersection of diagonals of the mounting surface.

6. The electronic component according to claim 1, further comprising:

a second outer electrode that is connected to the LC parallel resonator, and to which the unbalanced signal is inputted;

a third outer electrode and a fourth outer electrode that are respectively connected to opposite ends of the second coil, and from which the balanced signals are outputted;

a first low pass filter that is embedded in the laminate, the first low pass filter being connected between one end of the second coil and the third outer electrode; and

a second low pass filter that is embedded in the laminate, the second low pass filter being connected between another end of the second coil and the fourth outer electrode.

7. The electronic component according to claim 1, wherein:

the second coil includes;

a second coil conductor layer that is provided on the plurality of insulator layers;

a third via conductor that is connected to one end of the second coil conductor layer; and

a fourth via hole conductor that is connected to another end of the second coil conductor layer; and

the first coil conductor layer and the second coil conductor layer are opposed to each other with one of the plurality of insulator layers disposed between the first coil conductor layer and the second coil conductor layer.

8. The electronic component according to claim 1, wherein:

the electronic component further comprises a second outer electrode to which a bias voltage is applied; and

the second coil is connected to the second outer electrode.

9. The electronic component according to claim 1, wherein:

the electronic component further comprises a second outer electrode that is grounded; and

the second coil is connected to the second outer electrode.

10. The electronic component according to claim 6, wherein the first outer electrode includes a first straight-line portion and a second straight-line portion, the first straight-line portion and the second straight-line portion cross each other at an intersection of diagonals of the mounting surface.

11. The electronic component according to claim 10, wherein:

the electronic component further comprises a fifth outer electrode and a sixth outer electrode that are provided on the mounting surface, and are grounded;

the first low pass filter includes;

a third coil that is connected between the one end of the second coil and the third outer electrode; and

a second capacitor that is connected between a portion between one end of the third coil and the third outer electrode, and the fifth outer electrode;

the second low pass filter includes;

a fourth coil that is connected between the other end of the second coil and the fourth outer electrode; and

a third capacitor that is connected between a portion between the fourth coil and the fourth outer electrode, and the sixth outer electrode; and

ground conductor layers of the second capacitor and the third capacitor are connected to the fifth outer electrode and the sixth outer electrode, respectively, by extending to the mounting surface.

12. The electronic component according to claim 11, wherein:

the electronic component further comprises a seventh outer electrode that is grounded; and

the second coil is connected to the seventh outer electrode.

13. The electronic component according to claim 12, wherein the second through seventh outer electrodes are arranged such that the first outer electrode is between the second through seventh outer electrodes.

14. The electronic component according to claim 11, wherein:

the ground conductor layer of the first capacitor is provided on one side of a laminating direction with respect to conductor layers that define the LC parallel resonator, the second coil, the first low pass filter, and the second low pass filter, excluding the ground conductor layer; and

the ground conductor layers of the second capacitor and the third capacitor are provided on another side of the laminating direction with respect to the conductor layers that define the LC parallel resonator, the second coil, the first low pass filter, and the second low pass filter, excluding the ground conductor layers.

15. The electronic component according to claim 11, wherein:

the electronic component further comprises a seventh outer electrode to which a bias voltage is applied; and

the second coil is connected to the seventh outer electrode.

16. The electronic component according to claim 15, wherein the second through seventh outer electrodes are arranged such that the first outer electrode is between the second through seventh outer electrodes.

17. The electronic component according to claim 10, wherein the first outer electrode has a cross shape.

18. The electronic component according to claim 17, wherein the second through fourth outer electrodes are arranged such that the first outer electrode is between the second through fourth outer electrodes.

19. The electronic component according to claim 17, wherein the second through fourth outer electrodes each have a rectangular or substantially rectangular shape.