Title:
OSCILLATOR, FILTER, DUPLEXER AND COMMUNICATION APPARATUS
Document Type and Number:
WIPO Patent Application WO/2003/052862
Kind Code:
A1
Abstract:
On an upper surface of a substrate (1), conduction paths (2a, 2b, 2c) circularly extend greater than just one circle and constitute ring units of oscillation in such a manner that the two ends of each conduction path (2a, 2b, 2c) are adjacent to each other in the width direction, and those units of oscillation are concentrically multiplexed. In this way, a part where the two ends of each conduction path are adjacent to each other is caused to serve as a capacitive region; the other parts are caused to serve as inductive regions; and each conduction path is caused to serve as a half-wave path with its two ends opened. There is no need to provide any grounding electrodes to the surface of the substrate opposite to the surface where the conduction paths are provided. As a result, an oscillator can be made by use of a very small number of constituent elements. In this way, there can be obtained an oscillator, a filter, a duplexer and a communication apparatus that can be easily made small in size and exhibit a desired Q-response appropriate to the manufacturing cost.
Inventors:
HIDAKA SEIJI (JP)
ABE SHIN (JP)
ABE SHIN (JP)
Application Number:
PCT/JP2002/013181
Publication Date:
June 26, 2003
Filing Date:
December 17, 2002
Export Citation:
Assignee:
MURATA MANUFACTURING CO (JP)
HIDAKA SEIJI (JP)
ABE SHIN (JP)
HIDAKA SEIJI (JP)
ABE SHIN (JP)
International Classes:
H01P1/203; H01P1/213; H01P7/08; (IPC1-7): H01P1/203
Foreign References:
| JPS62183202A | 1987-08-11 | |||
| JP2000049512A | 2000-02-18 | |||
| JPS63212202A | 1988-09-05 | |||
| JPH0244802A | 1990-02-14 | |||
| JP2000244213A | 2000-09-08 | |||
| US5055809A | 1991-10-08 | |||
| DE19757323A1 | 1999-07-01 |
Other References:
See also references of EP 1458050A4
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