公开(公告)号：WO2018236438A1

公开(公告)日：2018-12-27

申请号：PCT/US2018/022519

申请日：2018-03-14

Applicant: WESTERN DIGITAL TECHNOLOGIES, INC.

Inventor： WALLASH, Albert ,  CONTRERAS, John ,  PARKINEN, Ronald ,  XING, Xinzhi ,  HE, Hui

IPC: H05K1/02 ,  H01P3/06 ,  H05K1/16 ,  H01F17/00 ,  H05K3/40

CPC classification number: H05K1/0233 ,  H01F17/0013 ,  H01F17/0033 ,  H01F2017/002 ,  H01P1/2007 ,  H03H7/0115 ,  H05K1/0221 ,  H05K1/0225 ,  H05K1/0237 ,  H05K1/0298 ,  H05K1/165 ,  H05K3/4069 ,  H05K2201/09618 ,  H05K2201/097

Abstract: Disclosed herein are printed circuit boards (100) with embedded solenoid filters (110A-L, 120A-K) through which signal traces (140) pass to filter unwanted noise and electromagnetic interference. A printed circuit board (100) comprises a least three layers (102, 104, 106), a solenoid embedded within the at least three layers, and at least one trace (140) extending through the solenoid. The insertion loss characteristics of the solenoid filter can be tuned by modifying the number of turns in the solenoid(s) and the width (160) of the solenoid(s). The solenoid filter may comprise multiple solenoids connected in series, with adjacent solenoids having opposite wind directions. Surface components may be included on the board to tune the insertion loss further.

公开(公告)号：WO2019005234A1

公开(公告)日：2019-01-03

申请号：PCT/US2018/022800

申请日：2018-03-16

Applicant: WESTERN DIGITAL TECHNOLOGIES, INC.

Inventor： XING, Xinzhi ,  WALLASH, Albert ,  CONTRERAS, John

IPC: H05K1/02 ,  H01P3/02

Abstract: Disclosed herein are printed circuit boards with at least one signal trace situated over or under a reference plane. The reference plane includes a broadband common-mode filter that comprises looping and parallel structures etched into the reference plane. The looping structure includes an even number of side arms, and the parallel structure comprises an even number of interior arms, wherein each of the side arms extends toward the parallel structure, and each of the interior arms extends toward the looping structure. The at least one signal trace is substantially parallel to the side arms and to the interior arms, and is situated between a first half of the even number of side arms and a second half of the even number of side arms and between a first half of the even number of interior arms and a second half of the even number of interior arms.