发明名称 |
Surface wave devices with low passband ripple |
摘要 |
Very low passband ripple is provided in a wide bandwidth high frequency SAW FIR filter using slanted finger IDTs by one or more of three techniques: cancelling regenerated SAWs at parallel-connected input IDTs of two SAW filters which are similar except for a quarter-wavelength difference in spacing of the input and output IDTs, this difference varying with wavelength across the IDT aperture; shaping edges of shield electrodes to provide quarter-wavelength differences in, and hence cancellation of, SAWs reflected at the edges, the differences varying with wavelength across the IDT aperture; and making pairs of slanted shield electrodes symmetrical to compensate for refraction of SAWs by the shield electrodes.
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申请公布号 |
US2004108917(A1) |
申请公布日期 |
2004.06.10 |
申请号 |
US20020315134 |
申请日期 |
2002.12.10 |
申请人 |
JIAN CHUN-YUN;BEAUDIN STEVE A.;SYCHALEUN SOMSACK |
发明人 |
JIAN CHUN-YUN;BEAUDIN STEVE A.;SYCHALEUN SOMSACK |
分类号 |
H03H9/00;H03H9/02;H03H9/145;H03H9/64;(IPC1-7):H03H9/64 |
主分类号 |
H03H9/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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