Elastic surface acoustic wave resonator, elastic surface acoustic wave filter and elastic surface acoustic wave duplexer, and communications equipment

A surface acoustic wave, communication device technology, applied in electrical components, impedance networks, etc., can solve problems such as leakage, and achieve the effects of suppressing power consumption, excellent power resistance, and reducing insertion loss

Inactive Publication Date: 2006-10-04
KYOCERA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such leakage has not previously been considered a problem for duplexers, but has become a problem in recent years due to stringent performance requirements

Method used

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  • Elastic surface acoustic wave resonator, elastic surface acoustic wave filter and elastic surface acoustic wave duplexer, and communications equipment
  • Elastic surface acoustic wave resonator, elastic surface acoustic wave filter and elastic surface acoustic wave duplexer, and communications equipment
  • Elastic surface acoustic wave resonator, elastic surface acoustic wave filter and elastic surface acoustic wave duplexer, and communications equipment

Examples

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Embodiment Construction

[0075] Hereinafter, examples of the surface acoustic wave device of the present invention will be described in detail with reference to the diagrams. And mark the same symbol at the same position on the drawing. In addition, since the size of each electrode, the distance between electrodes, etc., or the number and interval of electrode fingers, etc. are shown schematically for description, it is not limited to what is shown in a figure.

[0076] figure 1 Shown is a top view of a surface acoustic wave resonator.

[0077] This surface acoustic wave resonator is on a piezoelectric substrate (refer to figure 2 "19" in "19"), an element in which a plurality of electrodes composed of metal thin films are formed on one main surface, and the formed electrodes are IDT electrode 1, reflector electrode 2, auxiliary reflector electrode 3, and the like.

[0078] The IDT electrode 1 has electrode fingers 13 formed to extend inwardly at right angles to two bus electrodes 12a extending i...

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Abstract

Disclosed is a surface acoustic wave resonator which comprises, on a piezoelectric substrate 19 , an IDT electrode 1, reflector electrodes 2 disposed to be adjacent to both sides of the IDT electrode 1 in a main propagation direction F of surface acoustic waves at the IDT electrode 1 , and auxiliary reflector electrodes 3 that are disposed at four positions external to the reflector electrodes 2 on virtual straight lines extending from the bus bar electrodes 12 a of the IDT electrode 1 in an inclined manner so that the periodic direction G of periodically arranged electrodes 14 b is oriented toward the IDT electrode 1.

Description

technical field [0001] The present invention relates to a surface acoustic wave resonator (Surface Acoustic Wave Resonator) with improved Q, a surface acoustic wave filter (Surface Acoustic Wave Filter) with improved insertion loss, and improved isolation characteristics, insertion loss, and electrical resistance. A surface acoustic wave duplexer (Surface Acoustic Wave Duplexer), and a communication device using these surface acoustic wave filters, surface acoustic wave duplexers, and surface acoustic wave resonators. [0002] Such surface acoustic wave resonators, surface acoustic wave filters, and surface acoustic wave duplexers are collectively referred to as "surface acoustic wave elements". Surface acoustic wave components are widely used in the field of mobile communications, such as filters in the RF and IF segments of mobile phones. Background technique [0003] In recent years, surface acoustic wave elements that are small, lightweight, and sensitive in isolation h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03H9/145
Inventor 船见雅之横田裕子饭冈淳弘
Owner KYOCERA CORP
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