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Directional coupler

A directional coupler and electromagnetic coupling technology, applied in waveguide-type devices, impedance networks, electrical components, etc., can solve problems such as inability to extract signals, filters are easily damaged by static electricity, and filter frequency characteristics are degraded. Effect

Pending Publication Date: 2021-12-03
MURATA MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, such filters have the problem of being easily damaged by static electricity
When the filter is damaged by static electricity, the frequency characteristic of the filter deteriorates, and the desired signal cannot be extracted

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0045] [1-1. Structure]

[0046] First, use figure 1 The configuration of the directional coupler according to Embodiment 1 will be described. figure 1 It is a figure showing the structure of the directional coupler 1 concerning this embodiment.

[0047] like figure 1 As shown, the directional coupler 1 has a main line 10, a secondary line 20, a plurality of filters 30 and 31, a coupling output terminal 40, a plurality of filter switching circuits 50 and 51, a bypass switch 55, and a plurality of filter protection switches. 60a, 60b, 61a and 61b, direction switching circuit 70 and termination circuit 80. The main line 10 and the sub line 20 are electromagnetically coupled to each other.

[0048] In the present embodiment, the directional coupler 1 includes a semiconductor IC (Integrated Circuit, integrated circuit) and one or more external elements connected to the semiconductor IC. The main line 10, the sub line 20, the plurality of filter switching circuits 50 and 51, a...

Embodiment approach 2

[0117] Next, Embodiment 2 will be described.

[0118] The directional coupler according to Embodiment 2 differs from Embodiment 1 mainly in the structure of the filter switching circuit and the filter protection switch. Hereinafter, the description will focus on the differences from Embodiment 1, and the description of the common points will be omitted or simplified.

[0119] [2-1. Structure]

[0120] First, use Figure 4 The configuration of the directional coupler according to Embodiment 2 will be described. Figure 4 It is a figure showing the structure of the directional coupler 101 which concerns on this embodiment.

[0121] like Figure 4 As shown, in the directional coupler 101, compared with the directional coupler 1 according to Embodiment 1, the difference is that the switches provided between the filters 30 and 31 and the nodes N1 and N2 are replaced by two A T-shaped switching circuit with two series switches and one parallel switch. Specifically, the directi...

Embodiment approach 3

[0153] Next, Embodiment 3 will be described.

[0154] In Embodiment 3, the main difference from Embodiments 1 and 2 is that there are a plurality of main lines and sub lines. Hereinafter, description will focus on differences from Embodiments 1 and 2, and descriptions of common points will be omitted or simplified.

[0155] [3-1. Structure]

[0156] First, use Figure 5 The configuration of the directional coupler 201 according to Embodiment 3 will be described. Figure 5 It is a figure showing the structure of the directional coupler 201 which concerns on this embodiment.

[0157] like Figure 5 As shown, the directional coupler 201 includes two main lines 10 and 210 , three sub lines 20 , 20A, and 220 , two filters 30 and 31 , and a coupled output terminal 40 . Furthermore, the directional coupler 201 includes a plurality of switches 50a to 50d, 51a to 51e, 250c, 251c and 251e, filter protection switches 60a, 60b, 61a and 61b, bypass switches 55 and 255, direction switc...

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Abstract

The invention provides a directional coupler which suppresses deterioration of frequency characteristics of a filter. The directional coupler (1) is provided with: a main line (10); a sub-line (20) electromagnetically coupled to the main line (10); a coupling-out terminal (40); a plurality of filters (30 and 31); filter switching circuits 50 and 51 capable of connecting each of the plurality of filters 30 and 31 to the one end 21 of the sub line 20 and the output terminal 40; a plurality of filter protection switch 60a,60b,61a and 61b which are directly connected to both ends of each of the plurality of filters 30 and which can switch the connection and the opening of the one end of the corresponding filter and the reference potential.

Description

technical field [0001] This invention relates to directional couplers. Background technique [0002] For example, Patent Document 1 discloses a directional coupler including a main line and a sub line. A variable filter circuit including a plurality of filters is connected between the sub-line and the coupling port of the directional coupler. [0003] prior art literature [0004] patent documents [0005] Patent Document 1: International Publication No. 2019 / 189232 [0006] As the filter, for example, a small and high-performance filter using thin film microfabrication can be used. However, such a filter has a problem that it is easily destroyed by static electricity. When the filter is destroyed by static electricity, the frequency characteristic of the filter deteriorates, and a desired signal cannot be extracted. Contents of the invention [0007] The problem to be solved by the invention [0008] Therefore, an object of the present invention is to provide a dir...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03H7/40H03H7/48H01P5/18
CPCH03H7/40H03H7/48H01P5/18H03H7/0123H03H7/06
Inventor 德田大辅清水克也关健太金良守
Owner MURATA MFG CO LTD