Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Surface acoustic wave filter and communicator

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

Inactive Publication Date: 2003-03-05
MURATA MFG CO LTD
View PDF0 Cites 0 Cited by
  • 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Surface acoustic wave filter and communicator
  • Surface acoustic wave filter and communicator
  • Surface acoustic wave filter and communicator

Examples

Experimental program
Comparison scheme
Effect test

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 part (IDT interconnected body) 201 forming a longitudinally coupled resonator made of aluminum electrodes (foil) by photolithography or the like, and the above-mentioned surface acoustic wave A surface acoustic wave resonator 202 and a surface acoustic wave resonator 203 are connected in series to the filter unit 201 . 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, the surface acoustic wave filter for PCS (Personal Communication System) reception will be described as an example.

[0056] In the surface acoustic wave filter unit 201 , IDTs 204 ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

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 began to use GSM (Global System for MobileCommunications) as the main method. [0003] The so-called balanced-unbalanced conversion means that when a balanced line such as a paralle...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): H03H9/00H03H9/25H03H9/64
CPCH03H9/14582H03H9/6436H03H9/0042H03H9/64
Inventor 高峰裕一
Owner MURATA MFG CO LTD
Features
  • Generate Ideas
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com