Surface-acoustic-wave filter
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专利名称：Surface-acoustic-wave filter
发明人：Satoh, Yoshio c/o Fujitsu Limited,Ikata,
Osamu c/o Fujitsu Limited,Miyashita,
Tsutomu c/o Fujitsu Limited,Matsuda,Takashi
c/o Fujitsu Limited,Takamatsu, Mitsuo c/o
Fujitsu Limited
申请号：EP99100121.5
申请日：19921027
公开号：EP0928064A3
公开日：
19990901
专利内容由知识产权出版社提供
专利附图：
摘要：A SAW bandpass filter includes parallel arms 62-64 each containing a first SAW resonator R, R, R having a predetermined resonance frequency (f), and a series arm 61 containing second SAW resonators R, R having a predetermined resonance frequency (f) approximately equal to or higher than the antiresonance frequency of the first SAW resonator (f). The resonators have reflectors 132, 133 on both sides of their interdigital electrodes 131. These reflectors, however, can give rise to an undesired ripple in the pass band. In the invention the ripple is substantially eliminated by selecting the thickness (i.e. the weight) of the electrode films so that the ripple is pushed out of the pass band. For instance, with aluminium electrodes the thickness should be 0·06-0·09.λ, where λ is the finger pitch.
申请人：FUJITSU LIMITED
地址：1-1, Kamikodanaka 4-chome, Nakahara-ku Kawasaki-shi, Kanagawa 211-8588 JP 国籍：JP
代理机构：Gibbs, Christopher Stephen
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