LC resonator and LC filter

Patent metadata

Field	Value
Publication number	US-12244283-B2
Application number	US-202217881701-A
Country	US
Kind code	B2
Filing date	Aug 5, 2022
Priority date	Apr 10, 2020
Publication date	Mar 4, 2025
Grant date	Mar 4, 2025

Abstract

An LC resonator includes first and second plane electrodes, a first line electrode, a first and second via conductors, and a third plane electrode. The second plane electrode is opposed to at least a portion of the first plane electrode in a specific direction. The first via conductor and the second via conductor extend from the first line electrode in the specific direction to be connected to the first plane electrode and the second plane electrode, respectively. The third plane electrode is opposed to at least a portion of the second plane electrode in the specific direction. The second plane electrode is between the first plane electrode and the third plane electrode in the specific direction.

First claim

What is claimed is:

1. An LC resonator comprising:
a first plane electrode;
a second plane electrode opposed to at least a portion of the first plane electrode in a specific direction;
a first line electrode;
a first via conductor and a second via conductor extending from the first line electrode in the specific direction to be connected to the first plane electrode and the second plane electrode, respectively; and
a third plane electrode opposed to at least a portion of the second plane electrode in the specific direction; wherein
the second plane electrode is between the first plane electrode and the third plane electrode in the specific direction;
the third plane electrode is a ground electrode;
the second plane electrode and the ground electrode define a capacitor; and
a total length of the first via conductor is shorter than a total length of the second via conductor.

2. An LC resonator comprising:
a first plane electrode;
a second plane electrode opposed to at least a portion of the first plane electrode in a specific direction;
a first line electrode;
a first via conductor and a second via conductor extending from the first line electrode in the specific direction to be connected to the first plane electrode and the second plane electrode, respectively;
a third plane electrode that is a ground electrode and is opposed to at least a portion of the second plane electrode in the specific direction;
a ground terminal opposed to at least a portion of the third plane electrode in the specific direction; and
at least one ground via connector which connects the ground terminal to the third plane electrode; wherein
the second plane electrode is between the first plane electrode and the third plane electrode in the specific direction; and
the second plane electrode and the ground electrode define a capacitor.

3. An LC resonator comprising:
a first plane electrode;
a second plane electrode opposed to at least a portion of the first plane electrode in a specific direction;
a first line electrode;
a first via conductor and a second via conductor extending from the first line electrode in the specific direction to be connected to the first plane electrode and the second plane electrode, respectively; and
a third plane electrode opposed to at least a portion of the second plane electrode in the specific direction; wherein
the second plane electrode is between the first plane electrode and the third plane electrode in the specific direction;
the third plane electrode is a ground electrode;
the second plane electrode and the ground electrode define a capacitor; and
the first plane electrode and the second plane electrode define another capacitor.

4. An LC filter comprising:
a first terminal and a second terminal; and
a first LC resonator and a second LC resonator; wherein
both of the first LC resonator and the second LC resonator have a same configuration as the LC resonator according to claim 3 ;
the first plane electrode of the first LC resonator is electrically connected to the first terminal; and
the first plane electrode of the second LC resonator is electrically connected to the second terminal.

5. The LC resonator according to claim 3 , wherein only a portion of the second plane electrode overlaps the first plane electrode.

6. The LC resonator according to claim 3 , wherein the first line electrode, the first via conductor, and the second via conductor together define an inductor.

7. The LC resonator according to claim 6 , wherein
the first capacitor is connected in parallel with the inductor; and
the first capacitor and the inductor are both connected in series with the second capacitor.

8. The LC resonator according to claim 3 , wherein a total length of the first via conductor is shorter than a total length of the second via conductor.

9. An LC filter comprising:
a first terminal and a second terminal; and
a first LC resonator and a second LC resonator; wherein
both of the first LC resonator and the second LC resonator have a same configuration as the LC resonator according to claim 3 ;
the third plane electrode of the first LC resonator is electrically connected to the first terminal; and
the third plane electrode of the second LC resonator is electrically connected to the second terminal.

10. The LC filter according to claim 9 , further comprising:
an LC parallel resonator to receive a signal from one of the first LC resonator and the second LC resonator, and to transmit the signal to another one of the first LC resonator and the second LC resonator.

11. The LC filter according to claim 9 , further comprising:
a ground inductor connected between ground and both the first LC resonator and the second LC resonator.

12. The LC filter according to claim 11 , further comprising:
a capacitor provided in series with the first terminal and the second terminal.

13. The LC filter according to claim 9 , wherein the first terminal and the second terminal are both land grid array terminals which are provided on a bottom surface of a multilayer body which includes the first LC resonator and the second LC resonator.

14. The LC filter according to claim 13 , further comprising:
a ground terminal provided on the bottom surface of the multilayer body.

15. The LC filter according to claim 14 , further comprising:
a ground inductor connected between ground and both the first LC resonator and the second LC resonator; wherein
the ground inductor is defined by via conductors connected to the ground terminal.

16. The LC filter according to claim 9 , further comprising:
a third LC resonator and a fourth LC resonator; wherein
both of the third LC resonator and the fourth LC resonator has a same configuration as the LC resonator according to claim 3 .

17. The LC filter according to claim 16 , wherein
the third LC resonator and the fourth LC resonator are connected in parallel with one another; and
the first LC resonator and the second LC resonator are connected in series between the first terminal and the second terminal.

18. The LC filter according to claim 16 , wherein all of the first LC resonator, the second LC resonator, the third LC resonator, and the fourth LC resonator are connected in parallel with one another.

19. The LC filter according to claim 18 , further comprising:
a first coupling capacitance between the first LC resonator and the first terminal; and
a second coupling capacitance between the second LC resonator and the second terminal.

20. The LC filter according to claim 19 , further comprising:
a third coupling capacitance between the first LC resonator and second LC resonator.

Assignees

• Murata Manufacturing Co

Inventors

• Ogawa Keisuke

Classifications

• H03H2001/0085

  Multilayer, e.g. LTCC, HTCC, green sheets · CPC title

• H01F27/40

  Structural association with built-in electric component, e.g. fuse · CPC title

• H01F27/29

  Terminals; Tapping arrangements {for signal inductances} · CPC title

• H01F2017/0026

  Multilayer LC-filter · CPC title

• H01F17/0013

  with stacked layers · CPC title