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发明授权
CN1989692B 弹性边界波装置 有权

弹性边界波装置
摘要：
本发明提供可以防止更高频率下的导体电阻增加且具有小延迟时间温度系数的弹性边界波装置。弹性边界波装置(10)包含IDT(13)，IDT(13)包含在第一介质(11)和第二介质(12)之间安置的层压导体层，其中将在厚度方向上平分IDT(13)的平面看作是界面，在界面的第一介质(11)一侧存在的弹性边界波能量为E1且在界面的第二介质(12)一侧存在的弹性边界波能量为E2，并且其中如果IDT(13)只由在层压导体层中具有最高密度的导体层构成，则在界面的第一介质(11)一侧存在的弹性边界波能量为E1′且在界面的第二介质(12)一侧存在的弹性边界波能量为E2′时，弹性边界波的能量可以满足E1/E2＜E1′/E2′的关系，使得在由所述层压导体层构成的IDT(13)中弹性边界波的声速等于在IDT(13)只由具有最高密度的导体层形成时弹性边界波的声速。
摘要（英）：

The invention provides an elastic boundary wave device that effectively confines an elastic boundary wave even at a higher operating frequency and that has a small delay temperature coefficient. The elastic boundary wave device (10) includes an interdigital electrode IDT (13) including laminated conductor layers disposed between a first medium (11) and a second medium (12), wherein a plane that divides the IDT (13) in half in the thickness direction defines an interface, the energy of an elastic boundary wave present on the side of the first medium (11) of the interface is denoted as E1 , and the energy of an elastic boundary wave present on the side of the second medium (12) of the interface is denoted as E2 , and wherein if the IDT (13) included only a conductor having the highest density among the laminated conductor layers of the IDT, when the energy of an elastic boundary wave present on the side of the first medium (11) of the interface is denoted as E1' and the energy of an elastic boundary wave present on the side of the second medium (12) of the interface is denoted as E2'; the energies of an elastic boundary wave would satisfy the relationship of E1/E2

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