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公开(公告)号：US12074582B2
公开(公告)日：2024-08-27
申请号：US17597467
申请日：2020-07-14
CPC分类号： H03H9/02992 , H03H9/15 , H03H9/25 , H10N30/87
摘要： An electroacoustic resonator comprises a substrate (3) with a piezoelectric material and an interdigital electrode structure on a top side (33) of the substrate. The electrode structure comprises a first electrode (1) and a second electrode (2) each with a busbar (20) and a plurality of fingers (10). The fingers of both electrodes interdigitate. The region of the top side between the two busbars is subdivided into two barrier regions (113), two trap regions (112) and one track region (111), the trap regions being located between the two barrier regions and the track region being located between the two trap regions. At least some fingers each comprise one barrier portion (13), two trap portions (12) and one track portion (11), wherein the barrier portion is associated with the barrier region closest to the busbar assigned to the finger, the trap portions are each associated with one of the trap regions and the track portion is associated with the track region. The fingers are configured such that the velocity of a main mode of surface acoustic waves is smaller in the trap regions than in the track region. Each electrode comprises a plurality of stub fingers (30) being shorter than the fingers. Each stub finger is associated only with the barrier region closest to the busbar assigned to the stub finger. The electrodes are configured such that a velocity of the main mode in the barrier regions is greater than in the track region.
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公开(公告)号：US12040777B2
公开(公告)日：2024-07-16
申请号：US17440158
申请日：2020-03-27
CPC分类号： H03H9/145 , H03H9/02637 , H03H9/25 , H03H9/6483
摘要： A SAW transducer and a SAW resonator are proposed composed of consecutively arranged unit cells of length L. Slight geometry or material variations such as variations of the metallization ration or the unit cell length L affecting the pitch) between these unit cells result in improved spurious mode suppression while the main mode performance is unaffected.
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