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Laminated filter

A filter and resonator technology, which is applied to waveguide devices, structurally fixed capacitor combinations, transformer/inductor parts, etc., can solve problems such as unconsidered electromagnetic coupling balance, difficulty in fine-tuning magnetic field coupling, and weakening magnetic field coupling.

Pending Publication Date: 2022-03-18
MURATA MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the multilayer bandpass filter disclosed in Patent Document 1, the balance of electromagnetic coupling generated between two striplines arranged in parallel is not considered.
[0007] When the directions of the loops of the inductor electrodes of two adjacent LC parallel resonators are reversed as disclosed in Patent Document 2, the magnetic field coupling can be weakened, but fine adjustment of the magnetic field coupling is difficult.
In addition, in the case where multiple ground electrodes are formed on the same dielectric layer, manufacturing variations are likely to occur

Method used

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Experimental program
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Effect test

Embodiment approach 1

[0033] figure 1 It is an equivalent circuit diagram of the laminated filter 1 of the first embodiment. figure 1 The desired equivalent circuit is the same as the equivalent circuit of the laminated filter 1a of the modification of the first embodiment described later. Hereinafter, an electric field coupling generated between the two circuit elements is expressed by the capacitor. That is, the two circuit elements are connected to each other via the capacitor. Further, in the case where the two circuit components are electrically connected, the case of directly connected by the two circuit elements, and the two circuit elements perform electric field coupling (capacitive coupling).

[0034] Such as figure 1 As shown, the laminated filter 1 includes an input output terminal P1 (first terminal), input output terminal P2 (second terminal), LC parallel resonator LC1 (first LC resonator), LC parallel resonator LC2 (second LC Resonator), LC parallel resonator LC3 (fourth LC resonator), ...

Embodiment approach 2

[0074] In the second embodiment, the configuration of the attenuation characteristics of the laminated filter is further improved by electropping the two terminals of the laminated filter of the first embodiment.

[0075] Figure 10 Is an equivalent circuit diagram of the laminated filter 2 of the second embodiment. Such as Figure 10 As shown, the equivalent circuit of the laminated filter 2 is figure 1 The equivalent circuit of the laminated filter 1 adds the equivalent circuit of the capacitor C22. Same other than this, the description is not repeated. Such as Figure 10 As shown, the input / output terminals P1, P2 are connected to each other via the capacitor C22.

[0076] Figure 11 Overlooking from the Y-axis direction Figure 10 A view of the electrode structure inside the laminated filter 2. The electrode structure of the laminated filter 2 is Figure 5 The electrode structure of the laminated filter 1 additionally has an electrode structure after the coupling electrode 231 (...

Embodiment approach 3

[0083] Figure 14 It is an equivalent circuit diagram of the laminated filter 3 of the third embodiment. The equivalent circuit of the laminated filter 3 is from figure 1 The laminated filter 1 includes the equivalent circuit after the LC parallel resonator LC4 is removed from the LC parallel resonator LC4. In addition to the change in the change in the LC parallel resonator LC4, it is not repeated.

[0084] Such as Figure 14 As shown, the LC parallel resonator LC3 (third LC resonator) is connected to the ground point G1. The LC parallel resonator LC3 is connected to the input / output terminal P2 via the capacitor C20. The LC parallel resonator LC3 is connected to the LC parallel resonator LC1 via the capacitor C13.

[0085] The above, according to the laminated filter of the third embodiment, the attenuation characteristics can be improved.

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Abstract

A laminated filter (1) is provided with a first ground electrode (111), a second ground electrode (112), a first LC resonator (LC1), and a second LC resonator (LC2). The first LC resonator (LC1) includes a first line electrode (101), a first capacitor electrode (102), a first via conductor (V11), and a second via conductor (V12). A second via conductor (V12) extends from the first line electrode (101) toward the side where the first capacitor electrode (102) is disposed, and connects the first line electrode (101) and the first ground electrode (111). The second LC resonator (LC2) includes a second line electrode (201), a second capacitor electrode (202), a third via conductor (V21), and a fourth via conductor (V22). A fourth via conductor (V22) extends from the second line electrode (201) toward the side where the second capacitor electrode (202) is disposed, and connects the second line electrode (201) and the second ground electrode (112).

Description

Technical field [0001] The present invention relates to a laminated filter. Background technique [0002] In the past, a laminated filter formed as a laminated body as a plurality of dielectric layers is known. For example, a laminated band pass filter is disclosed in International Publication No. 2002 / 009225 (Patent Document 1). In this laminated band pass filter, two striplines constituting the resonator are disposed in the same space. The electromagnetic coupling can be generated by arranging two strips lines in parallel. As a result, the capacitance between the resonator can be omitted, and the thinning of the laminated body can be realized. [0003] Further, the direction of the circuit of the inductor electrode based on the input side LC parallel resonator is disclosed in International Publication No. 2007 / 119356 (Patent Document 2), and LC adjacent to an inductor electrode based on the input side LC parallel resonator The laminated band pass filter in the direction of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03H7/09H01P1/20H01F27/00H03H7/01H01G4/40
CPCH03H7/09H01P1/20H01F27/00H03H7/01H01G4/40H03H2001/0085H03H7/0115H03H7/1775H03H7/1708H03H7/1766H03H2001/0057
Inventor 小川圭介
Owner MURATA MFG CO LTD
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