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Title:
MICROWAVE RESONATOR AND FILTER CIRCUIT USING THIS RESONATOR
Document Type and Number:
Japanese Patent JP2591402
Kind Code:
B2
Abstract:

PURPOSE: To provide a resonator, which is used in a filter circuit, an oscillating circuit, or the like with respect to microwave and is easy to produce and is small-sized and has a sharp frequency characteristic, and a filter circuit which uses them and has an excellent characteristic.
CONSTITUTION: One ends and the other ends of first and second lines 11a and 11b constituting a parallel coupling line 11 in a strip line or micro strip line structure are connected to each other respectively by third and fourth lines 12 and 13 to constitute a close loop structure, and the coupling between parallel lines is strengthened to make the resonance frequency lower than the frequency having the electric length of the close loop as one wave, and the resonator is miniaturized, and the unloaded Q is raised. This resonator is used in the filter circuit to realize a small-sized filter having a sharp frequency characteristic.


Inventors:
Takahashi, Kazuaki
Hasegawa, Makoto
Makimoto, Mitsuo
Application Number:
JP1992000153238
Publication Date:
March 19, 1997
Filing Date:
June 12, 1992
Export Citation:
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Assignee:
MATSUSHITA ELECTRIC IND CO LTD
International Classes:
H01P1/203; H01P7/08; (IPC1-7): H01P1/203; H01P7/08
Domestic Patent References:
JP55104103A
JP63102403A
JP2246601A
Attorney, Agent or Firm:
滝本 智之