Multiplexer, transmission device, and reception device

a transmission device and multi-channel technology, applied in the field of multi-channels, can solve the problems of preventing accurate impedance adjustment, reducing the impedance of the first inductance element, and reducing the impedance of the first inductance element, and achieve excellent impedance matching

Active Publication Date: 2018-12-27
MURATA MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This configuration achieves precise impedance matching and improved attenuation within and outside the pass band, maintaining high-frequency accuracy and reducing unnecessary coupling, thereby enhancing the multiplexer's performance.

Problems solved by technology

At this time, if parasitic capacitance is generated on the first inductance element, the impedance of the first inductance element is decreased and the impedance matching is degraded, thus preventing accurate impedance adjustment.

Method used

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  • Multiplexer, transmission device, and reception device
  • Multiplexer, transmission device, and reception device
  • Multiplexer, transmission device, and reception device

Examples

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Effect test

first preferred embodiment

[0061]In a first preferred embodiment of the present invention, a quadplexer is described that is applied to Band 25 (transmission frequency band: about 1850 MHz to about 1915 MHz, reception frequency band: about 1930 MHz to about 1995 MHz) and Band 66 (transmission frequency band: about 1710 MHz to about 1780 MHz, reception frequency band: about 2010 MHz to about 2200 MHz) of the LTE (Long Term Evolution) standard, for example. In the quadplexer, an antenna end of an unbalanced duplexer for Band 25 and an antenna end of a non-equilibrium duplexer for Band 66 connected in common.

[0062]FIG. 1 is a block diagram illustrating an example of a functional configuration of a multiplexer according to the first preferred embodiment. As illustrated in FIG. 1, a multiplexer 1 includes filters 11 to 14, inductance elements 41 and 42, a common signal terminal P0, selection signal terminals P1 to P4, and a ground terminal GND.

[0063]The filters 11 and 12 are preferably a transmission-side filter f...

second preferred embodiment

[0123]FIG. 12 is a block diagram illustrating an example of a functional configuration of a multiplexer according to a second preferred embodiment of the present invention. As illustrated in FIG. 12, a multiplexer 2 includes filters 11 to 14, inductance elements 41 and 43, a common signal terminal P0, selection signal terminals P1 to P4, and a ground terminal GND.

[0124]In the multiplexer 2, compared to the multiplexer 1 in FIG. 1, a filter 13a as the transmission-side filter for Band 66 and the inductance element 43 are changed. The inductance element 43 is connected between a reference terminal and a signal path connecting a common connection point 30 and the common signal terminal P0.

[0125]FIG. 13 is a circuit diagram illustrating an example of a configuration of the filter 13a. As illustrated in FIG. 13, in the filter 13a, the parallel resonator 351 is removed from the filter 13 illustrated in FIG. 2C.

[0126]With the above-described configuration, impedance matching is obtained as...

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Abstract

A multiplexer includes filters on one principal surface of a mounting substrate and having mutually different frequency bands, and an inductance element which is incorporated in the mounting substrate and one end of which is connected to one end of the filter. The other end of the inductance element and one end of each of the filters, are connected to each other at a common connection point. The inductance element is defined by spiral wiring conductors disposed in first and second wiring layers provided in an inner layer of the mounting substrate. The mounting substrate includes third and fourth wiring layers which are adjacent to the first and second wiring layers, and in which no ground pattern is provided in a portion corresponding to a formation region of the inductance element.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]This application claims the benefit of priority to Japanese Patent Application No. 2017-122822 filed on Jun. 23, 2017. The entire contents of this application are hereby incorporated herein by reference.BACKGROUND OF THE INVENTION1. Field of the Invention[0002]The present invention relates to multiplexers provided with elastic wave filters, transmission devices, and reception devices.2. Description of the Related Art[0003]In recent years, cellular phones have been required to support a plurality of frequency bands and a plurality of radio systems, in other words, required to be capable of supporting multiband communication and multimode communication by a single terminal. To meet the above requirement, a multiplexer configured to demultiplex a high frequency signal containing a plurality of radio carrier frequencies is disposed immediately next to a single antenna. As a plurality of band pass filters defining the multiplexer, elastic wave...

Claims

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Application Information

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Patent Type & AuthorityApplications(United States)
IPC IPC(8): H03H9/72H01L25/065H01L41/047H01L41/053H03H9/64H03H7/38H03H9/145H04B1/40H10N30/87H10N30/88H10N39/00
CPCH03H9/72H01L25/0655H01L41/0475H01L41/053H01L27/20H03H7/38H03H9/14552H04B1/40H03H9/6483H03H9/02574H03H9/64H03H9/725H04B1/0057H04B1/16H04B1/18H03H9/0557H03H9/0566H03H9/542H03H9/6476H01L23/66H01L2223/6655H03H9/145H04B1/04H04B1/52H10N30/88H10N30/875H10N39/00
InventorTAKAMINE, YUICHI
OwnerMURATA MFG CO LTD