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Title:
弾性表面波フィルタ
Document Type and Number:
Japanese Patent JP4251409
Kind Code:
B2
Abstract:
A surface acoustic wave filter constituted by cascading a first electrode structure line including an input/output IDT, two receiving IDTs outside the input/output IDT and two reflectors outside the two receiving IDTs, and a second electrode structure line including an input/output IDT, two receiving IDTs outside the input/output IDT and two reflectors outside the two receiving IDTs. When the surface acoustic wave filter is expressed by an electrically equivalent, symmetrical lattice circuit expressed by a series arm impedance and a parallel arm impedance, a pass band is formed by using at least two resonances of the series arm impedance and at least three resonances of the parallel arm impedance. Thus a surface acoustic wave filter having low supuriousness and a board band is realized.

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Inventors:
大村 正志
本望 洋
阿部 秀典
Application Number:
JP52278496A
Publication Date:
April 08, 2009
Filing Date:
March 15, 1996
Export Citation:
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Assignee:
京セラキンセキ株式会社
International Classes:
H03H9/64; H03H9/00
Domestic Patent References:
JP5267990A
JP7050543A
JP3034715A
JP64082706A
JP4278707A
JP5110371A
JP2202710A
Attorney, Agent or Firm:
北野 好人