Elastic surface wave filter device

一种弹性表面波、弹性表面的技术，应用在器件材料选择、压电器件/电致伸缩器件、压电/电致伸缩/磁致伸缩器件等方向，能够解决通带产生脉动等问题，达到陡峭滤波器特性的效果

Active Publication Date: 2013-09-25
MURATA MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] However, in the surface acoustic wave filter device described in Patent Document 1, pulsation may occur in the pass band

Method used

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Embodiment Construction

[0047] Next, about the preferred mode of carrying out the present invention, enumerate figure 1 The shown surface acoustic wave filter device 1 will be described as an example. The surface acoustic wave filter device 1 of the present embodiment is a duplexer having a ladder-type surface acoustic wave filter unit. A duplexer is a type of splitter. However, the surface acoustic wave filter device according to the present invention is not limited to a duplexer. The surface acoustic wave filter device according to the present invention is not particularly limited as long as it has a ladder-type surface acoustic wave filter unit, and may be other wave splitters such as triplexers, or may include input signal terminals or The configuration of a plurality of filter units in which at least one of the output signal terminals is not connected in common may be a configuration including only one ladder-type surface acoustic wave filter unit.

[0048] figure 1 It is an equivalent circu...

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Abstract

Provided is an elastic surface wave filter device having steep filter characteristics in addition to having a broad transmission band while the ripple within the transmission band is suppressed. The elastic surface wave filter device (1) utilizes Rayleigh waves as the primary mode and comprises a ladder-type elastic surface wave filter (20). The thickness (t1) of a dielectric layer (33) of an elastic surface wave resonator (30) constituting a series arm resonator is different from the thickness (t2) of a dielectric layer (43) of an elastic surface wave resonator (40) constituting a parallel arm resonator. The propagation direction (A1) of the elastic surface waves in the elastic surface wave resonator (30) constituting the series arm resonator is different from the propagation direction (A2) of the elastic surface waves in the elastic surface wave resonator (40) constituting the parallel arm resonator.

Description

technical field [0001] The present invention relates to surface acoustic wave filter devices. In particular, the present invention relates to a surface acoustic wave filter device having a ladder-type surface acoustic wave filter unit. Background technique [0002] Conventionally, surface acoustic wave filters utilizing surface acoustic waves have been used, for example, as bandpass filters or wave splitters in RF (Radio Frequency) circuits mounted in communication devices such as mobile phones. device. As an example of such a surface acoustic wave filter device, for example, Patent Document 1 below describes a surface acoustic wave filter device having a ladder-type surface acoustic wave filter unit. Patent Document 1 describes that, among a plurality of surface acoustic wave resonators constituting a ladder-type surface acoustic wave filter unit, a protective film is provided on the IDT electrode of each surface acoustic wave resonator, and by making the parallel arm ela...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03H9/64H01L41/09H01L41/18H03H9/145H03H9/25H03H9/72
CPCH03H9/02559H03H9/02834H03H9/14541H03H9/6483H03H9/725H03H9/64H10N30/8542H03H9/145H10N30/20H10N30/85H03H9/54
Inventor 玉崎大辅上坂健一
Owner MURATA MFG CO LTD
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