发明申请
- 专利标题： Saw element and saw device
- 专利标题（中）： 锯元件和锯装置
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申请号： US10253988申请日： 2002-09-25
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公开(公告)号： US20030062969A1公开(公告)日： 2003-04-03
- 发明人: Kenji Inoue
- 申请人： TDK Corporation
- 申请人地址： JP Tokyo
- 专利权人： TDK Corporation
- 当前专利权人： TDK Corporation
- 当前专利权人地址： JP Tokyo
- 优先权： JP2001-292470 20010925; JP2001-292471 20010925; JP2001-292472 20010925; JP2001-301854 20010928; JP2001-352450 20011116
- 主分类号： H03H009/00
- IPC分类号： H03H009/00
摘要：
The SAW element 11 comprises a serial arm 17 formed between an input terminal 15 and an output terminal 16, two serial arm side SAW resonators 20 located in the serial arm 17, at least three parallel arms 19 connected between the serial arm 17 and a reference potential terminal 18, and parallel arm side SAW resonator 21 located in the parallel arms 19, respectively. Each of these parallel arm side SAW resonators 21 has an anti-resonant frequency corresponding with the predetermined resonant frequency of each serial arm side SAW resonator 20. Further, at least one parallel arm side SAW resonator 21 has a resonant frequency different from those of the other parallel arm side SAW resonators 21. Thereby, not only insertion loss can be prevented from being deteriorated but also an attenuation characteristic of the SAW element 11 can be readily varied.
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