# US 7,407,415 B2 · Crosstalk reduction in dual inline memory module (DIMM) connectors

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- Number: US 7,407,415 B2
- Document ID: US7407415B2
- Status: Granted
- Kind: B2
- Application number: 11/422,654
- Filed: 2006-06-07
- Published: 2007-12-13
- Granted: 2008-08-05
- Earliest claimed: 2006-06-07
- Assignees: International Business Machines Corporation
- Inventors: Lei Shan; Jiali Wu
- Web page: https://patentgrep.com/patent/US7407415B2

## CPC

- H01R 13/6599: Dielectric material made conductive, e.g. plastic material coated with metal
- Y10S 439/941: Crosstalk suppression
- H01R: ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS

## Abstract

A DIMM connector having reduced crosstalk includes ceramic particles having a high dielectric constant and/or composite fibers mixed into materials used for fabricating a connector housing of the DIMM connector.

## Claims

### Claim 1

A method for fabricating a DIMM connector, comprising:
assembling a plurality of pins adapted for coupling to circuit components, wherein the pins provide for communicating input and output signals with the circuit components;
mixing high dielectric constant ceramic particles comprising a one of a mono-modal distribution of particle sizes, a bi-modal distribution of particle sizes and a multi-modal distribution of particle sizes having a diameter ranging from in the nanometers to in the micrometers and composite fibers within material for jacketing at least a portion of each of the pins in the plurality; wherein a quantity of the ceramic particles is adjusted to control a dielectric constant for a housing of the connector, according to a formula
ɛ
=
[
ɛ
1
1
/
3
+
v
2
⁡
(
ɛ
2
1
/
3
-
ɛ
1
1
/
3
)
]
3
where
∈ represents a dielectric constant for the connector housing
∈1 represents a dielectric constant of the material,
∈2 represents a dielectric constant of the ceramic particles; and
ν2 represents a volume fraction of the ceramic particles in the material; and,
jacketing circuit components and the at least a portion of pins for the DIMM connector with the mix of particles and material to form the connector housing.