TRANSMISSION LINE RESONATOR, HIGH-FREQUENCY FILTER USING THE SAME, HIGH-FREQUENCY MODULE, AND RADIO DEVICE

• US 20100007445A1
• Filed: 08/28/2007
• Published: 01/14/2010
• Est. Priority Date: 08/31/2006
• Status: Active Grant

• Current Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Original Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Inventors: Tamura, Masaya, Ishizaki, Toshio
• Granted Patent: US 8,222,975 B2
• Time in Patent Office: Days
• US Class Current: 333/204
• 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 having a low-loss characteristic. In order to realize the low-loss characteristic, the transmission line type resonator in the present invention 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 consisting of 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 the end face of the transmission line type resonator, which connection terminal being connected with the transmission line of complex right hand left hand system.

2. The transmission line type resonator of claim 1, wherein the transmission line of complex right hand left hand system is structured of

a line electrode disposed on dielectric sheet,

a connection pattern electrode whose line width is smaller than that of the line electrode, connected with the line electrode,

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 electrode.

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

the line electrode is provided in a plurality on the dielectric sheet,

the transmission line of complex right and left hand system is provided with a capacitance electrode which is disposed so as it opposes to the line electrode via dielectric sheet placed on the plurality of line electrodes.

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

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

the dielectric sheet is made of a low temperature co-fired ceramics.

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

the dielectric sheet is made with a resin sheet.

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

the plurality of dielectric sheets have the same thickness.

8. The transmission line type resonator of claim 3, wherein

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

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

the connection pattern electrode has a meandering line.

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

the connection pattern electrode has a spiral coil.

11. The transmission line type resonator of claim 3, wherein

the capacitance electrode is provided for two or more number of layers on and under the line electrode.

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

the line electrode is provided for a plurality of layers,

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

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

the line electrode is grounded by means of via hole electrode instead of the connection pattern electrode.

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

the via hole is provided in the way with a stub electrode.

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

the laminate body is provided through a shrink firing process.

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

the laminate body is provided through a non-shrink firing process.

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

the via hole has a tapered shape narrowing downward in each of the respective dielectric sheets.

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

the line electrode is a split type line electrode.

19. The transmission line type resonator of claim 3, wherein

the capacitance electrode is a split type capacitance electrode.

20. 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 of the lower surface.

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

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

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