Transmission line resonator, high-frequency filter using the same, high-frequency module, and radio device

• US 8,222,975 B2
• Filed: 08/28/2007
• Issued: 07/17/2012
• Est. Priority Date: 08/31/2006
• Status: Active Grant

• Current Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Original Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Inventors: Ishizaki, Toshio, Tamura, Masaya
• Primary Examiner(s): Ham, Seungsook
• Application Number:
  US12/438,840
• Publication Number:
  US 20100007445A1
• Time in Patent Office: 1,785 Days
• Field of Search: 333/165, 333/167, 333/168, 333/176, 333/185, 333/202, 333/204, 333/205, 333/219, 333/235
• US Class Current: 333/219
• CPC Class Codes: H01P 1/203 Strip line filters
• CPC Class Codes: H01P 7/084 Triplate line resonators H01P7/088 takes precedence

Abstract

A transmission line type resonator has a low-loss characteristic and, in order to realize the low-loss characteristic, the transmission line type resonator includes a laminate body formed of a plurality of dielectric sheets, a transmission line of complex right hand left hand system disposed between the plurality of dielectric sheets, and an external connection terminal disposed at the end face of the transmission line type resonator and connected with the transmission line of complex right hand left hand system.

Claims

1. A transmission line type resonator formed of a laminate body constituted by a plurality of dielectric sheets, comprising:

a transmission line of complex right hand left hand system provided between the plurality of dielectric sheets; and

an external connection terminal provided at an end face of the transmission line type resonator, the connection terminal being connected with the transmission line of complex right hand left hand system,

wherein the transmission line of complex right hand left hand system is structured of

a line electrode disposed on one of the dielectric sheets,

a connection pattern electrode whose line width is smaller than that of the line electrode, connected with the line electrode and formed on a same surface extending from an edge of the line electrode in a same layer in which the line electrode is formed,

a grounding electrode connected with the connection pattern electrode, and

an input/output pattern electrode disposed so as to make capacitive coupling with the line electrode, connected with the external connection terminal.

2. The transmission line type resonator of claim 1, wherein

the line electrode is one of a plurality of line electrodes disposed on said one of the plurality of dielectric sheets,

the transmission line of complex right hand left hand system is provided with a capacitance electrode which is disposed so as to be opposed to one of the line electrodes via one of the dielectric sheets placed on the plurality of line electrodes.

3. The transmission line type resonator of claim 1, the resonance mode of which is zero-order.

4. The transmission line type resonator of claim 1, wherein

said one of the dielectric sheets is made of a low temperature co-fired ceramics.

5. The transmission line type resonator of claim 1, wherein

said one of the dielectric sheets is made with a resin sheet.

6. The transmission line type resonator of claim 1, wherein

the plurality of dielectric sheets have the same thickness.

7. The transmission line type resonator of claim 2, wherein

a distance between the capacitance electrode and said one of the line electrodes is smaller than a distance between a shield pattern electrode disposed on the capacitance electrode and the capacitance electrode, or a distance between a shield pattern electrode disposed under said one of the line electrodes and said one of the line electrodes.

8. The transmission line type resonator of claim 1, wherein

the connection pattern electrode has a meandering line.

9. The transmission line type resonator of claim 1, wherein

the connection pattern electrode has a spiral coil.

10. The transmission line type resonator of claim 2, wherein

the capacitance electrode is provided for two or more layers above and underneath the line electrode.

11. The transmission line type resonator of claim 1, wherein

the line electrode is provided for a plurality of layers,

each of the respective layers is shifted in location so that the line electrodes on respective layers are positioned alternating to those on each other layer.

12. The transmission line type resonator of claim 1, wherein

the laminate body is constituted by a shrink-fired laminate body.

13. The transmission line type resonator of claim 1, wherein

the laminate body is constituted by a non-shrink fired laminate body.

14. The transmission line type resonator of claim 1, wherein

the line electrode is a split type line electrode.

15. The transmission line type resonator of claim 2, wherein

the capacitance electrode is a split type capacitance electrode.

16. The transmission line type resonator of claim 1, wherein

the external connection terminal is disposed on the laminate body at least at the upper surface or the lower surface.

17. A high frequency filter which contains a transmission line type resonator of claim 1.

18. A high frequency module which contains a transmission line type resonator of claim 1.

19. A wireless apparatus which contains a transmission line type resonator of claim 1.