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Multiplexer and communication apparatus

A multiplexer and passband technology, applied in the direction of duplex signal operation, amplifier, amplifier combination, etc., can solve the problems of inductor magnetic field coupling degree deviation, deviation, filter isolation characteristic deviation, etc.

Active Publication Date: 2020-08-07
MURATA MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007]However, when the coil patterns formed on the multilayer substrate are brought close to each other as in the high-frequency module disclosed in Patent Document 1 to achieve magnetic field coupling between inductors , Due to variations in dimensional accuracy and physical property values ​​during the manufacture of multilayer substrates, the degree of magnetic field coupling between inductors varies
Due to the variation in the degree of magnetic field coupling, there is a problem that the isolation characteristic between filters varies.

Method used

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  • Multiplexer and communication apparatus
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Experimental program
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Embodiment approach

[0054] [1. Circuit configuration of multiplexer 1]

[0055] figure 1 It is a circuit configuration diagram of the multiplexer 1 according to the embodiment. As shown in the figure, the multiplexer 1 includes a common terminal 100, transmission terminals 110 and 130, reception terminals 120 and 140, transmission filters 10 and 30, reception filters 20 and 40, and an inductor Lm.

[0056] The transmission filter 10 is a first filter disposed between the transmission terminal 110 (first terminal) and the output terminal 111 and uses the transmission frequency band of BandA (the first frequency band) as a passband. The output terminal 111 is connected to the common terminal 100 .

[0057] The transmission filter 10 includes series arm resonators s1, s2, and s3, parallel arm resonators p1, p2, and p3, and inductors L1, L2.

[0058] The series arm resonators s1 to s3 are arranged on a first path connecting the common terminal 100 and the transmission terminal 110 .

[0059] The ...

Embodiment approach 2

[0125] In this embodiment, a multiplexer 1A and a communication device 6 including the multiplexer 1A are shown, and the multiplexer 1A further adds a combination for selecting a frequency band for performing CA to the multiplexer 1 according to the first embodiment. the switching circuit.

[0126] Image 6 It is a circuit configuration diagram of the communication device 6 according to the second embodiment. As shown in the figure, the communication device 6 includes a multiplexer 1A, a transmission amplifier circuit 3T, a reception amplifier circuit 3R, an RF signal processing circuit (RFIC) 4 , and a baseband signal processing circuit (BBIC) 5 .

[0127] In addition to the constituent elements of the multiplexer 1 according to Embodiment 1, the multiplexer 1A further includes a transmission filter 15, a reception filter 25, transmission and reception filters 16 and 35, a switch circuit 70, switches 73 and 74, and a dual signal filter. device 80. The inductor Lm can also ...

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Abstract

A multiplexer (1) is provided with: a transmission filter (10) and a reception filter (40) which are connected to a common terminal (100); an inductor (Lm) connected to the common terminal; and a multilayer substrate (50) on which a transmission filter and a reception filter are mounted, the multilayer substrate comprising dielectric layers (51-56), the transmission filter having: a parallel arm resonator (p2) connected to the parallel arm terminal (t2) and a path connecting the common terminal and the transmission terminal (110); and an inductor (L2), connected with a parallel arm terminal and grounded; the inductor (Lm) includes a coil pattern (Lm3) formed on the dielectric layer (53) and a coil pattern (Lm4) formed on the dielectric layer (54). The inductor (L2) includes a coil pattern(L23) formed on the dielectric layer (53) and magnetically coupled to the coil pattern (Lm3), and an inductance value of the coil pattern (Lm4) is greater than an inductance value of the coil pattern(Lm3).

Description

technical field [0001] The invention relates to a multiplexer and a communication device. Background technique [0002] In recent years, mobile phones have been required to handle a plurality of frequency bands (multi-band) with one terminal. In order to cope with this, a multiplexer that divides and / or multiplexes high-frequency signals in a plurality of frequency bands is disposed directly below one antenna. This multiplexer has a configuration in which a plurality of filters having respective frequency bands as passbands are connected to a common terminal. [0003] Patent Document 1 discloses a multiplexer (high frequency module) in which a transmission filter and a reception filter are commonly connected to an external connection terminal. In the high-frequency module disclosed in Patent Document 1, the first inductor connected between the parallel arm resonator of the ladder-type elastic wave filter (transmission filter) and the ground, and the second inductor connect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L5/14
CPCH04L5/14H03F2200/451H03F3/245H03F3/72H03F3/195H03F2203/7209H03F2200/111H04B1/0057H03H9/0566H03H9/0557H03H7/09H03H9/6483H03H9/725H03H7/48H03H9/74H03H9/6489H03H9/02818H05K1/185H05K1/0298H03H2001/0021H03F2200/165H03F3/68H03F2200/171H03H9/059
Inventor 田口朋子
Owner MURATA MFG CO LTD
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