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Filter device, multiplexer, and communication device

A filter and elastic wave resonator technology, applied in the fields of filter devices, multiplexers and communication devices, can solve the problems of wide-band, steep stop-band, difficult to ensure both, and achieve the effect of low loss

Pending Publication Date: 2022-01-04
MURATA MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, in the filter described in Patent Document 1, it is difficult to have both a wide-band and low-loss passband ensuring isolation between a plurality of communication frequency bands having various bandwidths, a wide-band stopband, and a narrow band. steep stop band

Method used

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  • Filter device, multiplexer, and communication device
  • Filter device, multiplexer, and communication device
  • Filter device, multiplexer, and communication device

Examples

Experimental program
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Effect test

Embodiment approach 1

[0033] [1.1 Circuit configuration and high-frequency characteristics of filter 1]

[0034] Figure 1A It is a circuit configuration diagram of the filter 1 of Embodiment 1. The filter 1 is an example of a filter device, and includes input and output terminals 100 and 110 , an LC parallel resonant circuit 10 , and series arm resonators s1 and s2 as shown in the figure.

[0035] The input / output terminal 100 is an example of a first input / output terminal, and is a terminal for inputting a high-frequency signal from the outside or outputting a high-frequency signal to the outside. The input / output terminal 110 is an example of a second input / output terminal, and is a terminal for outputting a high-frequency signal to the outside or inputting a high-frequency signal from the outside.

[0036] The LC parallel resonance circuit 10 has an inductor L1 (first inductor) and a capacitor C1 (first capacitor) connected in parallel to each other.

[0037] The series arm resonator s1 is an...

Embodiment approach 2

[0072] In this embodiment, in order to realize the cellular (registered trademark) frequency band of the fourth generation mobile communication system (4G) and the fifth generation mobile communication system (5G) and the connection with GPS (Global Positioning System), the registered trademark ) corresponding to the passband and stopband, and the structure of the filter in which circuit elements such as inductors and capacitors are added to the elastic wave series resonant circuit of filter 1 will be described.

[0073] Figure 6A It is a circuit configuration diagram of the filter 2 of Embodiment 2. The filter 2 is an example of a filter device, and includes input / output terminals 100 and 110 , an LC parallel resonant circuit 10 , a parallel connection circuit 20 , and a series connection circuit 30 as shown in the figure. The filter 2 of the present embodiment differs from the filter 1 of the first embodiment in that inductors or capacitors are connected to the series arm ...

Embodiment approach 3

[0085] In this embodiment, a configuration of a multiplexer including the filter 1 of the first embodiment or the filter 2 of the second embodiment will be described.

[0086] Figure 7A It is a circuit configuration diagram of the multiplexer 5 of the third embodiment. As shown in the figure, the multiplexer 5 includes filters 2 , 3 , and 4 , and input / output terminals 100 , 110 , 120 , and 130 .

[0087] The input / output terminal 100 is a common terminal to which the filters 2 , 3 , and 4 are connected.

[0088] The filter 2 is the filter 2 of Embodiment 2, and is connected to the input / output terminal 100 . The filter 2 includes an LC parallel resonant circuit 10 (high pass filter: HPF), a parallel connection circuit 20 , and a series connection circuit 30 (band rejection filter: BRF). Thus, the filter 2 has a wide-band and low-loss first passband (combined frequency bands of the low-middle frequency band, mid-frequency band, and high-frequency band in the cellular frequ...

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Abstract

The invention relates to a filter device, a multiplexer and a communication device, and provides the filter device corresponding to a plurality of frequency bands having a wide-band and low-loss pass band, a wide-band stop band and a narrow-band and steep stop band. The filter (1) is provided with input / output terminals (100, 110); an LC parallel resonant circuit (10) having an inductor (L1) and a capacitor (C1) connected in parallel to each other; and an elastic wave series resonance circuit having series arm resonators (s1, s2) connected in series with each other, wherein the LC parallel resonance circuit (10) and the elastic wave series resonance circuit are connected in series between the input / output terminal (100) and the input / output terminal (110).

Description

technical field [0001] The invention relates to filter devices, multiplexers and communication devices. Background technique [0002] In the progress of multi-band front-end circuits in mobile terminals, a filter device having a wide-band and low-loss passband and a narrow-band and steep stopband is required. [0003] Patent Document 1 discloses a filter including two surface acoustic wave resonators connected in series. The stopband of the filter is specified according to the antiresonant frequency of the two SAW resonators. [0004] Patent Document 1: Japanese Patent Laid-Open No. 2012-156881 [0005] However, in the filter described in Patent Document 1, it is difficult to have both a wide-band and low-loss passband ensuring isolation between a plurality of communication frequency bands having various bandwidths, a wide-band stopband, and a narrow band. steep stopband. Contents of the invention [0006] Therefore, an object of the present invention is to provide a f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03H9/54H03H9/64H03H9/25H03H9/205H04J1/00
CPCH03H9/54H03H9/64H03H9/25H03H9/205H04J1/00H04B1/40H04B1/0057H03H7/1766H03H9/6433H03H7/46
Inventor 西尾圭介
Owner MURATA MFG CO LTD