JPS62198719U

JPS62198719U -

Info

Publication number: JPS62198719U
Application number: JP7521787U
Authority: JP
Priority date: 1987-05-21
Filing date: 1987-05-21
Publication date: 1987-12-17

Description

[Brief explanation of drawings]

第１図は本考案の表面波フイルタ素子の一実施
例を示す模式図、第２図は第１図のＡ―Ａ線に沿
つて切断して見た断面簡略図、第３図は本考案の
他の実施例を示す模式図、第４図及び第６図は従
来の表面波フイルタ素子の構造を示す模式図、第
５図は表面波フイルタ素子の周波数特性曲線図で
ある。１１１，１１２，３１，３２……入力電極、１
１３，１１４，３３，３４……出力電極、１１７
，１１８，１１９，１２０，１２１，３７，３８
，３９，４０，４１……ステムピン、１１１_１，
４２……シールド電極、４３……突起部。 Fig. 1 is a schematic diagram showing an embodiment of the surface wave filter element of the present invention, Fig. 2 is a simplified cross-sectional view taken along line A-A in Fig. 1, and Fig. 3 is a schematic diagram showing an embodiment of the surface wave filter element of the present invention. FIG. 4 and FIG. 6 are schematic diagrams showing the structure of a conventional surface wave filter element, and FIG. 5 is a frequency characteristic curve diagram of the surface wave filter element. 111, 112, 31, 32...input electrode, 1
13, 114, 33, 34...output electrode, 117
,118,119,120,121,37,38
, 39, 40, 41... Stem pin, 111 ₁ ,
42... Shield electrode, 43... Projection.

Claims

[Claims for Utility Model Registration] A piezoelectric substrate on which an input electrode and an output electrode are formed, each consisting of a shield electrode and a pair of comb-shaped electrodes facing each other with the shield electrode sandwiched therebetween; a stem on which the piezoelectric substrate is placed; a ground terminal electrically connected to one of the comb-shaped electrodes forming the input electrode and directly implanted in the stem; and the other forming the input electrode. and a signal input terminal that is electrically connected to the comb-shaped electrode of the stem and implanted in the stem via an insulating member, and electrically connected to each of the pair of comb-shaped electrodes that constitute the output electrode. , and at least a pair of output terminals implanted in the stem via an insulating member, and a line segment connecting the output terminal and the signal input terminal located at a short linear distance from the signal input terminal. A surface wave filter element characterized in that a ground terminal directly implanted in the stem is electrically connected to the shield electrode.