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Patent Searching and Data


Title:
BRANCHING FILTER AND ELECTRONIC EQUIPMENT USING THE SAME
Document Type and Number:
Japanese Patent JP2003163570
Kind Code:
A
Abstract:

To provide a branching filter having a small size and a good filter characteristic, and electronic equipment using the branching filter.

The branching filter has a multi-layer package (20) accommodating therein a pair of surface acoustic wave filters (26) each having a different band center frequency and phase matching line for matching respective phases of the pair of the surface acoustic wave filters, a multi layer package is provided with a first ground pattern (37) with respect to the phase matching line on its mounting surface. As a ground layer with respect to the phase matching line is provided on the mounting surface of the multi layer package, this make it possible to easily and properly set the distance between one of the phase matching line and the ground pattern, to prevent from deterioration of a characteristic impedance of the phase matching line, and to improve the filter characteristic.


Inventors:
IWAMOTO YASUHIDE
IGATA OSAMU
Application Number:
JP2001000359567
Publication Date:
June 06, 2003
Filing Date:
November 26, 2001
Export Citation:
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Assignee:
FUJITSU MEDIA DEVICE KK
FUJITSU LTD
International Classes:
H01L23/12; H01P1/213; H03H9/10; H03H9/25; H03H9/64; H03H9/72; (IPC1-7): H03H9/25; H01L23/12; H03H9/72
Attorney, Agent or Firm:
片山 修平