发明名称 Elastic wave filter
摘要 <p>To provide an elastic wave filter (10) capable of obtaining steep attenuation at a high band side or a low band side in a pass band and having high selectivity. An elastic wave filter is configured in a manner that when seen in a propagation direction of an elastic wave, as for respective electrode fingers composing each group of electrode fingers in an input side tapered IDT electrode (12) and an output side tapered IDT electrode (13), width dimensions thereof are the same one another, and a distance dimension between the adjacent electrode fingers is formed to be the same as the width dimension of the electrode finger, when seen in the propagation direction of an elastic wave, as for a group of electrode fingers in a grating reflector (16), width dimensions of respective electrode fingers composing the group of the electrode fingers are the same, and a distance dimension between the adjacent electrode fingers is formed to be the same as the width dimension, and the width dimension of the electrode finger and the distance dimension between the electrode fingers are set to be equal to or less than a minimum value or equal to or more than a maximum value of the width dimension of the electrode finger and the distance dimension between the electrode fingers in the input side tapered IDT electrode and the output side tapered IDT electrode.</p>
申请公布号 EP2180597(A1) 申请公布日期 2010.04.28
申请号 EP20090172892 申请日期 2009.10.13
申请人 NIHON DEMPA KOGYO CO., LTD. 发明人 TSUDA, TADAAKI
分类号 H03H9/02;H03H9/145;H03H9/64 主分类号 H03H9/02
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