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Surface acoustic wave filter and communicator

A surface acoustic wave and filter technology, applied to impedance networks, electrical components, etc., can solve problems such as large differences in amplitude characteristics and deterioration of balance

Inactive Publication Date: 2005-12-07
MURATA MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The two amplitude characteristics are very different, and the difference leads to a deterioration of the balance

Method used

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  • Surface acoustic wave filter and communicator
  • Surface acoustic wave filter and communicator
  • Surface acoustic wave filter and communicator

Examples

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Embodiment Construction

[0053] use below Figure 1 to Figure 19 Each embodiment of the present invention will be described.

[0054] first embodiment

[0055] Regarding the surface acoustic wave filter of the first embodiment of the present invention, as figure 1 As shown, on the piezoelectric substrate 20, a surface acoustic wave filter (IDT group) 201 with aluminum electrodes (foil) forming a longitudinally coupled resonator formed by photolithography or the like, and the above-mentioned surface acoustic wave filter 201 The surface acoustic wave resonator 202 and the surface acoustic wave resonator 203 are connected in series. Examples of materials for the piezoelectric substrate 20 include 40±5° YcutX transmission LiTaO 3 . In the surface acoustic wave filters of the following embodiments, a surface acoustic wave filter for PCS (Personal Communication System) reception will be described as an example.

[0056] In the surface acoustic wave filter 201 , IDTs 204 , 205 , and 206 are formed. The...

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Abstract

The surface acoustic wave filter is provided with IDTs (inter-digital transducers) 204, 205 and 206 placed along the propagation direction of a surface acoustic wave. The balanced signal terminals 210 and 211 are connected to the IDT 205. The IDTs 204, 205 and 206 are placed so as to be horizontally asymmetric with respect to a virtual axis assumed perpendicularly to the propagation direction in the middle of the propagation direction of the surface acoustic wave in each of the IDTs 204, 205 and 206. The invention provides a surface acoustic wave filter that enhances the balance between balanced signal terminals 210 and 211.

Description

technical field [0001] The present invention relates to a surface acoustic wave filter having filter characteristics, especially a balun conversion function, and a communication device using the filter. Background technique [0002] In recent years, the technology of miniaturization and weight reduction of mobile phones has advanced by leaps and bounds. The means of its realization, in addition to reducing the size by reducing various structural parts, has also developed the development of components that combine multiple functions. Against the backdrop of this situation, in recent years, research has been conducted on surface acoustic wave filters used in the high frequency (RF) band of mobile phones to have balanced-unbalanced conversion, that is, to have a so-called balum function. work, and started using GSM (Global System for Mobile Communications) as the main method. [0003] The so-called balanced-unbalanced conversion means that when a balanced line such as a paral...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03H9/00H03H9/25H03H9/64
CPCH03H9/14582H03H9/6436H03H9/0042H03H9/64
Inventor 高峰裕一
Owner MURATA MFG CO LTD
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