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Elastic Wave Resonance Device And Ladder Type Filter

A technology of elastic wave resonator and resonant device, applied in impedance network, electrical components and other directions, can solve the problem of insufficient improvement of power resistance, and achieve the effect of improving power resistance

Inactive Publication Date: 2014-10-15
MURATA MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] However, it is known that in the ladder-type filter described in Patent Document 1, only one series arm resonator is serially divided into three-stage resonators, and the power withstand performance cannot be sufficiently improved when a high frequency is achieved.

Method used

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  • Elastic Wave Resonance Device And Ladder Type Filter
  • Elastic Wave Resonance Device And Ladder Type Filter
  • Elastic Wave Resonance Device And Ladder Type Filter

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Embodiment Construction

[0072] The present invention will be clarified by describing specific embodiments of the present invention with reference to the accompanying drawings.

[0073] figure 1 It is a schematic plan view of an elastic wave resonator device according to an embodiment of the present invention. The elastic wave resonator 1 is a surface acoustic wave resonator using surface acoustic waves. The elastic wave resonator device 1 is configured by forming the illustrated electrode structure on a piezoelectric substrate 2 . In this electrode structure, three elastic wave resonators 5 to 7 constituted by dividing one elastic wave resonator into three are provided between the input electrode 3 and the output electrode 4 . That is, elastic wave resonators 5 to 7 are connected in series between input electrode 3 and output electrode 4 .

[0074] The elastic wave resonators 5 to 7 each have IDT electrodes 5a to 7a and reflectors 5b, 5c to 7b, and 7c. That is, each of elastic wave resonators 5 t...

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Abstract

The present invention provides an elastic wave resonance device which enables the electrical resistance to be improved even though realizing the high frequency. The elastic wave resonance device segments a hypothetical elastic wave resonator between an input end and an output end, and has n elastic wave resonators which are connected in series. When the interstage distance of the adjacent elastic wave resonators is set as L, the number of stages is set as n, the impedance represented by the cross width (lambda) * electrode finger logarithm N of the hypothetical elastic wave resonator before segmentation is set as Z, the proportion of the consumed electric power of the elastic wave resonators and the consumed electric power of a structure having the hypothetical elastic wave resonator, namely, the consumed electric power ratio is set as P, the interstage distance L satisfies the following formula: L<=(P-(3.19n2*10-2-1.57n*10-1+1017)) / (-1.20n+3.23)Z*10-6+(5.10n-12.3)*10-3).

Description

technical field [0001] The present invention relates to an elastic wave resonator using surface acoustic waves, boundary acoustic waves, and the like, and a ladder-type filter including the elastic wave resonator. Background technique [0002] Conventionally, various elastic wave resonators have been widely used in filter devices and the like. For example, Patent Document 1 below discloses a ladder-type filter using a plurality of elastic wave resonators. In this ladder-type filter, the series arm resonators and the parallel arm resonators are constituted by surface acoustic wave resonators. In addition, one series arm resonator is divided into three resonators connected in series with each other. That is, by dividing into three stages of series arm resonators, power resistance is improved. [0003] prior art literature [0004] patent documents [0005] Patent Document 1: Japanese Patent Laid-Open No. 2001-156588 [0006] As described in Patent Document 1, it is conve...

Claims

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Application Information

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IPC IPC(8): H03H9/02H03H9/145H03H9/64
Inventor 藤森永二
Owner MURATA MFG CO LTD
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