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Surface acoustic wave device

A surface acoustic wave and encapsulation technology used in semiconductor devices, electrical components, impedance networks, etc., can solve problems such as poor balance and inability to obtain balance.

Inactive Publication Date: 2005-10-19
MURATA MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But when Figure 30 In the structure shown, when trying to manufacture a filter with a balanced-unbalanced conversion function, there is such a problem that since the number of electrode finger joints of the IDT 102 is odd and the electrode fingers connected to the balanced signal terminal 106 Twice the number of contacts than the number of electrode fingers connected to the balanced signal terminal 107 degrades the balance
This problem becomes more pronounced due to the increase in the center frequency of the filter, in which the center frequency is about 1.9GHz, which is the same as the center frequency of the filter used in the digital cellular system (DCS) and the personal communication service (PCS). same, can't get enough balance

Method used

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Embodiment Construction

[0058] Hereinafter, the present invention will be clarified by describing certain preferred embodiments of the present invention with reference to the accompanying drawings.

[0059] refer to Figure 1-4 A surface acoustic wave device according to a first preferred embodiment of the present invention will be described. Furthermore, in the present preferred embodiment and the following preferred embodiments, a surface acoustic wave device applied to an Advanced Mobile Phone Service (AMPS) reception filter is described as an example.

[0060] In this preferred embodiment, the surface acoustic wave device 1 preferably includes a figure 2 The electrode structure shown on the piezoelectric substrate 2, the piezoelectric substrate 2 is preferably LiTaO defined by the intersection of 40±5°Y and X propagation direction (40±5°Y cutX propagation) 3 substrate.

[0061] exist figure 1 Among them, the first and second longitudinally coupled resonator-type surface acoustic wave filter...

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Abstract

A surface acoustic wave device includes a piezoelectric substrate, at least one IDT disposed on the piezoelectric substrate, and an input end and an output end connected to the IDT. At least one of the input end and the output end includes a pair of balanced signal terminals, and a delay line or a reactance component connected to one of the pair of balanced signal terminals.

Description

technical field [0001] The present invention relates to surface acoustic wave devices used, for example, as bandpass filters. In particular, the present invention relates to surface acoustic wave devices in which the input and / or output comprise a pair of balanced signal terminals. Background technique [0002] In recent years, portable phones have become smaller and lighter. In order to meet these requirements, it is necessary to reduce the number of component parts, miniaturize components, and realize function consolidation. [0003] In view of the above, various surface acoustic wave devices having a balun function or a balun adapter function used at the RF side of a cellular phone have been proposed. [0004] Figure 30 It is a plan view showing the electrode structure of a general surface acoustic wave filter having a balanced-unbalanced conversion function. [0005] Here, the first to third interdigital transducers (IDTs) 101-103 are disposed along the acoustic wave ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03H9/25H03H9/00H03H9/10H03H9/145H03H9/64
CPCH03H9/0061H03H9/0057H03H9/14588H03H9/059H03H9/6489H03H9/1071H03H9/0085H03H9/0042H01L2224/05554H01L2224/16225H01L2224/48227H01L2924/15174H01L2924/16195H03H9/64
Inventor 高峰裕一下江一伸田贺重人
Owner MURATA MFG CO LTD
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