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Filter device, composite filter device, and filter circuit

A filter and electrode technology, applied in the direction of electrical components, impedance networks, etc., can solve problems such as the increase in resonator temperature and the decrease in filter characteristics of filter devices, and achieve the effect of improving power resistance

Pending Publication Date: 2021-09-28
MURATA MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In particular, as the power of the signal input to the filter device increases, the temperature rise of the resonator increases
If the temperature of the resonator exceeds a certain temperature, a migration phenomenon may occur in the metal forming the resonator, causing a short circuit in the resonator and degrading the filter characteristics of the filter device.

Method used

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  • Filter device, composite filter device, and filter circuit
  • Filter device, composite filter device, and filter circuit
  • Filter device, composite filter device, and filter circuit

Examples

Experimental program
Comparison scheme
Effect test

no. 1 Embodiment approach

[0038] figure 1 It is a diagram showing a circuit diagram of the filter device 10 according to the first embodiment. The filter device 10 is a filter circuit that passes signals of a given frequency and attenuates signals of frequencies other than the given frequency. The filter device 10 according to the present embodiment is a ladder-type filter in which a plurality of resonators are arranged as series arms and parallel arms.

[0039] The filter device 10 mainly includes an input terminal 100 , an output terminal 102 , a filter unit 104 , and an open terminal 140 . A signal is input to an input terminal 100 of the filter device 10 and a signal is output from an output terminal 102 .

[0040] The filter unit 104 includes three series arm resonators 110 , 112 , and 114 , two parallel arm resonators 120 , 122 , and two ground terminals 130 , 132 . The numbers of the series arm resonators, parallel arm resonators, ground terminals, and open terminals are examples, and are not...

no. 2 Embodiment approach

[0063] From the second embodiment onwards, the description of matters common to the first embodiment will be omitted, and only the differences will be described. In particular, about the same function and effect based on the same structure, it will not be mentioned successively in each embodiment.

[0064] Figure 9 It is a circuit diagram of the filter device 12 according to the second embodiment. In filter device 12 according to the second embodiment, open terminal 142 is connected to a connection point between series arm resonator 110 closest to input terminal 100 and series arm resonator 112 second closest to input terminal 100 . In addition, a parallel arm resonator 120 is also connected to this connection point.

[0065] The electrode forming the open terminal 142 is connected to an open electrode (open portion) formed on the multilayer substrate. Therefore, it is possible to dissipate heat from the series arm resonators 110, 112, etc. through the open portion. As a ...

no. 3 Embodiment approach

[0067] Figure 10It is a circuit diagram of the filter device 15 according to the third embodiment. In the filter device 15 according to the present embodiment, two resonators are arranged in the order of the closest to the farthest from the input terminal 150 in the path (the first connection path 166 ) connecting the input terminal 150 and the output terminal 152 160 , 162 and longitudinally coupled resonator 164 . The longitudinally coupled resonator 164 includes three resonators, each of which is connected to a ground terminal. In addition, a resonator 170 is connected to a connection point between the resonator 160 and the resonator 162 . The resonator 170 is connected to a ground terminal 172 .

[0068] In the present embodiment, open terminal 174 is connected to a connection point between resonator 160 and resonator 162 . The electrode forming the open terminal 174 is connected to the electrode (open portion) formed on the multilayer substrate. The open portion can...

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Abstract

The invention provides a filter device, a composite filter device and a filter circuit capable of improving power resistance. The filter device is provided with: a first substrate; a first input electrode formed on the first substrate; a first output electrode formed on the first substrate; a first ground electrode which is formed on the first substrate and to which a ground potential is supplied; an open circuit portion formed on the first substrate and electrically open; a second substrate mounted on the first substrate; a second input electrode formed on the surface of the second substrate and connected to the first input electrode; a second output electrode formed on the surface of the second substrate and connected to the first output electrode; a second ground electrode formed on the surface of the second substrate and connected to the first ground electrode; and at least one first functional electrode which is formed on the surface of the second substrate and is disposed in a first connection path connecting the second input electrode and the second output electrode, wherein the open circuit portion is connected to the first connection path.

Description

technical field [0001] The invention relates to a filter device, a composite filter device and a filter circuit. Background technique [0002] Conventionally, a filter device for filtering a specific signal is used in a wireless communication device such as a mobile phone. For example, Patent Document 1 discloses a technology related to a ladder-type filter device formed by connecting series arm resonators and parallel arm resonators in a ladder shape. [0003] prior art literature [0004] patent documents [0005] Patent Document 1: Japanese Patent Application Laid-Open No. 6-303093 [0006] When a signal is input to the filter device, a resonance phenomenon occurs in a resonator included in the filter device, and the signal is converted into vibration, or the vibration is changed into a signal. At this time, the resonator generates heat, and the temperature of the resonator rises. [0007] In particular, as the power of the signal input to the filter device increases...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03H9/64H03H9/145
CPCH03H9/64H03H9/145H03H9/568H03H9/6483H03H9/0523H03H9/059H03H9/0566H03H9/25H03H9/02543
Inventor 大久保功太奥出贵之
Owner MURATA MFG CO LTD
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