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Device with material having acoustic effect

An acoustic effect, acoustic technology, applied in discontinuous tuning with variable adjustment elements, instruments, electrical components, etc., can solve the problem of not being able to offset manufacturing fluctuations, not talking about the realization of tunable filters, etc.

Inactive Publication Date: 2009-04-01
QUALCOMM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this change is too small to offset manufacturing fluctuations, let alone realize tunable filters

Method used

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  • Device with material having acoustic effect
  • Device with material having acoustic effect
  • Device with material having acoustic effect

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0024] figure 1 A filter in the form of a device 1 with an acoustically effective material 2 is shown in . The acoustic effect material 2 is made of piezoelectric substances such as LiNbO 3 , LiTaO 3 、 Bi 12 GeO 20 , Li 2 B 4 o 7 , AlPO 4 , GaAs, ZnO and / or quartz.

[0025] The acoustic effect material is at least partially at and / or near a phase transition point. The phase transition point is especially the Curie point of the ferroelectric material. It is well known that the permittivity [epsilon] varies strongly with temperature near the Curie point and also with applied electric field. This change changes the stiffness c of the material through piezoelectric coupling:

[0026] c = c 0 + d 2 ϵ .

[0027] where c 0 Represents the rigidity of the sound-absorbing material when there is no piezoelectric effect, and d re...

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Abstract

The invention relates to a data carrier in card form, carrying a piece of information which is visible and / or invisible from the outside. In order to increase the copy protection in a cost-effective manner, the data carrier is largely transparent.

Description

technical field [0001] The invention relates to devices in the form of filters having acoustically effective materials and to methods of operating such devices. Background technique [0002] Because the standards of mobile telecommunication systems are different in the world, and more and more different standards are proposed according to the required bandwidth in the transmission range, it is desirable to have a mobile communication system that can cover all these standards or at least some of these standards. telecommunications installations. In this case, there arises the problem that the transmission band and the reception band are at different frequencies, and also have different bandwidths. There is therefore an urgent need for electronically tunable telecommunication device filters which allow the telephone to be tuned to the desired standard via software. [0003] There is currently no tuned filter that solves the above problems. The current solution is to use the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03H9/64H03H3/04G06K19/16H03J3/08H03J3/28H03J5/02H03L7/18
CPCH03L7/0805H03H3/04H03L7/18H03H2009/02196H03J5/0272H03J3/28H03H9/6403H03J3/08
Inventor T·奥斯特塔格C·科尔登W·瑞勒
Owner QUALCOMM INC