Common mode choke coil

Abstract

The present disclosure provides a common mode choke coil that has an excellent noise suppression function. The common mode choke coil that includes an element body formed by stacking a plurality of insulating layers in a height direction; a first coil and a second coil that are built into the element body; a first outer electrode that is provided on a surface of the element body and is electrically connected to one end of the first coil; a second outer electrode that is provided on a surface of the element body at a position that faces the first outer electrode in a width direction that is perpendicular to the height direction and that is electrically connected to another end of the first coil; a third outer electrode that is provided on a surface of the element body and is electrically connected to one end of the second coil; and a fourth outer electrode that is provided on a surface of the element body at a position that faces the third outer electrode in the width direction and that is electrically connected to another end of the second coil. When L1 is an inductance of the first coil and L2 is an inductance of the second coil, 100*the absolute value of L1-L2 / ((L1+L2) / 2)<=5 at 1 GHz.

Description

technical field [0001] The present invention relates to common mode choke coils. Background technique [0002] A common mode choke coil is known as one type of noise filter for electric circuits. For example, Patent Document 1 discloses a common mode choke coil. The common mode choke coil includes: a main body made of an insulator; A coil conductor; a plurality of external electrodes arranged on the surface of the main body; and a plurality of external pads connecting the lead-out part and the external electrode, at the joint where the coil part and the lead-out part are connected, the angle formed by the coil part and the lead-out part is: obtuse angle. [0003] Patent Document 1: International Publication No. 2015 / 029976 [0004] In the common mode choke coil described in Patent Document 1, in order to suppress a decrease in inductance due to partial cancellation of magnetic flux generated by the coil conductors, at the contact point where the coil part and the lead-out...

AI Technical Summary

Problems solved by technology

However, in such a common mode choke coil, since the path lengths of the two coils are greatly different, there is a possibility that the inductance of the two coils may vary greatly

Therefore, if such a common mode choke coil is incorporated in a circuit, there will be a large deviation in the characteristic impedance between the signal line and the ground (GND) between the lines corresponding to each coil, which may cause a single line to be distorted. Signal Waveform Blunting Concerns

In other words, there is a concern that the noise suppression function of the common mode choke coil is degraded

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