# US 2014/0197906 A1 · Common mode filter

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- Number: US 2014/0197906 A1
- Document ID: US20140197906A1
- Status: Published application
- Kind: A1
- Application number: 14/150,459
- Filed: 2014-01-08
- Published: 2014-07-17
- Earliest claimed: 2013-01-14
- Assignees: Max Echo Technology Corporation
- Applicants: Max Echo Technology Corporation
- Inventors: Bin-Chyi Tseng; Koung-Fong Liu; Yu-Cheng Lin
- Web page: https://patentgrep.com/patent/US20140197906A1

## CPC

- H01P 1/20: Frequency-selective devices, e.g. filters
- H01F 17/0013: {with stacked layers}
- H01P 1/20345: {Multilayer filters}
- H01F 38/48: {Common mode inductor for reducing or eliminating common mode noise on parallel lines}
- H01F 2017/0073: {with a special conductive pattern, e.g. flat spiral}
- H01P 3/026: {Coplanar striplines [CPS]}
- H01P: WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE (operating at optical frequencies G02B)
- H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES

## Abstract

A common mode filter includes a plurality of substrates stacked along an axial direction, a first conductor structure and a second conductor structure disposed on the substrates and including a plurality of first rings and second rings disposed sequentially along the axial direction. The first rings and the second rings are disposed to alternate with each other along the axial direction. The first conductor structure and the second conductor structure are spaced apart by a first clearance in a first direction transverse to the axial direction.

## Claims

### Claim 1

A common mode filter, comprising:
a plurality of substrates stacked along an axial direction;
a first conductor structure disposed on said substrates and including a plurality of first rings connected electrically in series and disposed sequentially along the axial direction; and
a second conductor structure disposed on said substrates and including a plurality of second rings connected electrically in series and disposed sequentially along the axial direction;
wherein said first rings and said second rings are disposed to alternate with each other along the axial direction; and
wherein said first conductor structure and said second conductor structure are spaced apart by a first clearance in a first direction transverse to the axial direction.

### Claim 2 (depends on 1)

The common mode filter as claimed in claim 1, wherein:
each of said first rings has a first ring section, and a second ring section disposed opposite to said first ring section;
each of said second rings has a first ring segment disposed adjacent to said first rings sections of said first rings, and a second ring segment disposed opposite to said first ring segment; and
said first ring sections of said first rings are spaced apart from said first ring segments of said second rings by the first clearance in the first direction.

### Claim 3 (depends on 2)

The common mode filter as claimed in claim 2, wherein said second ring sections of said first rings are spaced apart from said second ring segments of said second rings by a second clearance in the first direction.

### Claim 4 (depends on 2)

The common mode filter as claimed in claim 2, wherein:
each of said first rings further has a first connecting section connected between said first ring section and said second ring section, and a second connecting section disposed opposite to said first connecting section and connected between said first ring section and said second ring section; and
each of said second rings further has a first connecting segment disposed adjacent to said first connecting sections of said first rings and connected between said first ring segment and said second ring segment, and a second connecting segment disposed opposite to said first connecting segment and connected between said first ring segment and said second ring segment.

### Claim 5 (depends on 4)

The common mode filter as claimed in claim 4, wherein:
projections of said first connecting sections of said first rings on a virtual plane perpendicular to the axial direction are substantially free from overlap with projections of said first connecting segments of said second rings on the virtual plane; and
projections of said second connecting sections of said first rings on the virtual plane are substantially free from overlap with projections of said second connecting segments of said second rings on the virtual plane.

### Claim 6 (depends on 5)

The common mode filter as claimed in claim 5, wherein said second ring sections of said first rings are spaced apart from said second ring segments of said second rings by a second clearance in the first direction.

### Claim 7 (depends on 1)

The common mode filter as claimed in claim 1, wherein said first rings and said second rings are substantially rectangular in shape.

### Claim 8 (depends on 4)

The common mode filter as claimed in claim 4, wherein said first conductor structure has a first axis, and said second conductor structure has a second axis, the second axis forming a first offset with the first axis in the first direction and further forming a second offset with the first axis in a second direction transverse to the first direction and the axial direction.

### Claim 9 (depends on 8)

The common mode filter as claimed in claim 8, wherein:
the first offset is sufficient to space said first ring sections of said first rings apart from said first ring segments of said second rings by the first clearance in the first direction; and
the second offset is sufficient to configure projections of said first connecting sections of said first rings on a virtual plane perpendicular to the axial direction to be substantially free from overlap with projections of said first connecting segments of said second rings on the virtual plane, and to configure projections of said second connecting sections of said first rings on the virtual plane to be substantially free from overlap with projections of said second connecting segments of said second rings on the virtual plane.

### Claim 10 (depends on 9)

The common mode filter as claimed in claim 9, wherein each of said first ring sections, said second ring sections, said first ring segments and said second ring segments extends in the second direction, and each of said first connecting sections, said second connecting sections, said first connecting segments and said second connecting segments extends in the first direction.

### Claim 11 (depends on 10)

The common mode filter as claimed in claim 10, wherein said first ring sections and said second ring segments are disposed between said first ring segments and said second ring sections in the first direction, and said second connecting sections and said first connecting segments are disposed between said first connecting sections and said second connecting segments in the second direction.