Monolithic LC components

• US 20020057139A1
• Filed: 07/18/2001
• Published: 05/16/2002
• Est. Priority Date: 08/09/2000
• Status: Active Grant

• Current Assignee: Murata Manufacturing Co Limited
• Original Assignee: Murata Manufacturing Co Limited
• Inventors: Kato, Noboru, Nomura, Hiroko, Matsumura, Sadayuki
• Granted Patent: US 6,542,052 B2
• Time in Patent Office: Days
• 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 3/00 Apparatus or processes specially adapted for the manufacture of impedance networks, resonating circuits, resonators
• 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

Abstract

A monolithic conduct includes a laminated stack of insulator sheets and inductor via-holes that are connected to each other in the direction in which the insulator sheets are laminated, thereby forming columnar inductors. Coupling adjusting via-holes are also connected to each other in the direction in which the insulator sheets are laminated, thereby forming a columnar coupling adjusting conductor. The columnar coupling adjusting conductor is disposed between and substantially parallel to the columnar inductors.

Claims

1. A monolithic LC component comprising:

a monolithic element including laminated insulator layers and via holes formed in the monolithic element;

a plurality of electromagnetically coupled LC resonators, each of said plurality of LC resonators being defined by an inductor and a capacitor disposed in said monolithic element, said inductor being defined by a first group of the via-holes that are connected in a direction in which said insulator layers are laminated; and

a coupling adjusting conductor defined by a second group of the via-holes connected in the direction in which said insulator layers are laminated, said coupling adjusting conductor being disposed between at least two of the adjacent LC resonators so as to adjust a coupling coefficient between said adjacent LC resonators, said coupling adjusting conductor being grounded.

2. A monolithic LC component according to claim 1, further comprising a coupling adjusting conductor pattern disposed on a surface of the insulator layer, wherein the inductors of said two adjacent LC resonators, between which said coupling adjusting conductor is interposed, are electrically connected to each other by said coupling adjusting conductor pattern.

3. A monolithic LC component according to claim 1, further comprising resonating capacitor patterns, an input capacitor pattern, an output capacitor pattern, and shield patterns.

4. A monolithic LC component according to claim 1, wherein the via holes include inductor via-holes and coupling adjusting via-holes.

5. A monolithic LC component according to claim 4, wherein the inductor via-holes are connected to each other to define columnar inductors.

6. A monolithic LC component according to claim 4, wherein the capacitor via-holes are connected to each other to define columnar capacitors.

7. A monolithic LC component according to claim 1, wherein one of the laminated insulator sheets is thicker than the others of the laminated insulator sheets.

8. A monolithic LC component according to claim 3, wherein a first end of each of the inductors is connected to and short-circuited by at least one of the shield patterns, and a second end of each of the inductors is connected to the resonating capacitor patterns.

9. A monolithic LC component according to claim 1, further comprising first and second LC resonators which are magnetically coupled to each other.

10. A monolithic LC component according to claim 3, wherein the input capacitor pattern is extended to the left side of the monolithic element and the output capacitor pattern is extended to the right side of the monolithic element.

11. A monolithic LC component according to claim 1, wherein the coupling adjusting conductor has a substantially circular cross section.

12. A monolithic LC component according to claim 1, wherein the coupling adjusting conductor is defined by coupling adjusting via-holes that are connected to each other and located substantially at the center of the laminated insulator sheets.

13. A monolithic LC component according to claim 4, further comprising two coupling adjusting conductor patterns arranged to electrically connect the inductor via-holes to surround the coupling adjusting via-hole.

14. A monolithic LC component according to claim 1, wherein the monolithic LC component is one of a band-pass filter, a low-pass filter, a high-pass filter, a duplexer, a triplexer, and a multiplexer.

16. A monolithic LC component according to claim 15, wherein one of the laminated insulator sheets is thicker than the others of the laminated insulator sheets.

17. A monolithic LC component according to claim 15, wherein the coupling adjusting conductor has a substantially circular cross section.

18. A monolithic LC component according to claim 15, wherein the coupling adjusting conductor is defined by coupling adjusting via-holes that are connected to each other and located substantially at the center of the lamninated insulator sheets.

19. A monolithic LC component according to claim 15, further comprising two coupling adjusting conductor patterns arranged to electrically connect the inductor via-holes to surround the coupling adjusting via-hole.

20. A monolithic LC component according to claim 15, wherein the monolithic LC component is one of a band-pass filter, a low-pass filter, a high-pass filter, a duplexer, a triplexer, and a multiplexer.

15. A monolithic LC component comprising:

a monolithic element including laminated insulator layers;

first and second electromagnetically coupled LC resonators, each of said first and second LC resonators being defined by an inductor and a capacitor disposed in said monolithic element, said inductor being defined by inductor via-holes that are formed in the monolithic element and connected in a direction in which said insulator layers are laminated;

a coupling adjusting conductor defined by conductor via-holes that are formed and connected in the direction in which said insulator layers are laminated, said coupling adjusting conductor being disposed between at least two of the adjacent LC resonators so as to adjust a coupling coefficient between said adjacent LC resonators, said coupling adjusting conductor being grounded; and

a coupling adjusting conductor pattern disposed on a surface of the insulator layer, wherein the inductors of said two adjacent LC resonators, between which said coupling adjusting conductor is interposed, are electrically connected to each other by said coupling adjusting conductor pattern.