Duplexer and elastic wave device

A technology of duplexer and elastic wave filter, which is applied in the direction of impedance network, electrical components, etc., and can solve problems such as deterioration of isolation characteristics

Inactive Publication Date: 2010-03-24
MURATA MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0015] When forming the matching circuit 1008, for the sake of miniaturization, when the structure using the above-mentioned SAW resonator and the coil is built in the above-mentioned substrate 1002, in the convent

Method used

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  • Duplexer and elastic wave device
  • Duplexer and elastic wave device
  • Duplexer and elastic wave device

Examples

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Embodiment Construction

[0062] 【0023】

[0063] Hereinafter, the present invention will be clarified by describing specific embodiments of the present invention with reference to the accompanying drawings.

[0064] 【0024】

[0065] figure 1 It is a schematic top view of a duplexer related to an embodiment of the present invention, figure 2 is a schematic plan view of the terminal structure on the lower surface of the laminated substrate used in the duplexer, wherein the terminal structure on the lower surface is shown through the laminated substrate.

[0066] 【0025】

[0067] And there, in figure 1 It is pointed out in that: the illustration of the electrode structure on the upper surface of the laminated substrate 2 described later is omitted, and the terminal structure on the lower surface 2b of the laminated substrate 2 and the terminal structure installed on the upper surface 2a of the laminated substrate 2 are shown through the laminated substrate 2 The electrical connection structure betwe...

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Abstract

A duplexer which can improve isolation characteristics between first and second balanced terminals of a reception filter chip is obtained. In a duplexer (1), a transmission elastic wave filter (3) anda reception elastic wave filter (4) are mounted on a laminated substrate (2), a coil connected between an antenna terminal and a ground potential is formed on the laminated substrate (2), the reception elastic wave filter (4) has first and second ground pads (10 and 11) connected to ground potentials of IDTs connected to first and second balanced terminals (32 and 33), the distance between the second ground pad (11) and the coil is set to be larger than the distance between the first ground pad (10) and the coil, and an inductance component in a conductive path (E) connecting the second ground pad (11) to the second ground terminal (35) is set to be smaller than an inductance component in a conductive path (D) connecting the first ground pad (10) to the first ground terminal (34).

Description

technical field [0001] 【0001】 [0002] The present invention relates to a duplexer used, for example, in the RF stage of mobile phone equipment and as an elastic wave device used as the duplexer. More specifically, the present invention relates to improved A duplexer for isolation between balanced terminals of a filter and an elastic wave device suitable for the duplexer. Background technique [0003] 【0002】 [0004] In order to reduce the number of components, duplexers have been widely used in the RF stage of mobile phone equipment. For example, in Patent Document 1 there has been disclosed a Figure 16 The duplexer 1001 is shown in the circuit structure. [0005] 【0003】 [0006] In the duplexer 1001 , a transmission-side filter chip 1003 and a reception-side filter chip 1004 are mounted on a substrate 1002 . The antenna terminal 1005 is connected to an external antenna 1006 . The transmitting side filter chip 1003 has a ladder-type circuit structure including a plur...

Claims

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Application Information

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IPC IPC(8): H03H9/72H03H9/25
CPCH03H9/725H03H9/644H03H9/0576H03H9/564H03H9/6483H03H9/0085H03H9/0076
Inventor 米仓博
Owner MURATA MFG CO LTD
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