Presentation 2018-03-16
Evaluation of Differential Skew Depending on Rotation Angle in Printed Circuit Board with Meshed Ground Plane
Chenyu Wang, Kengo Iokibe, Yoshitaka Toyota,
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Abstract(in Japanese) (See Japanese page)
Abstract(in English) In general, the rotation angle between the differential transmission lines and the meshed ground of a flexible printed circuit board is 45 ° and the differential-transmission lines are placed symmetrically to the pattern of the meshed ground. By considering the symmetry, the separation between adjacent differential lines depends on the pitch of the mesh structure. The decrease in the dielectric thickness with keeping the characteristic impedance expands the mesh pitch. However, this reduces the wiring density. On the other hand, the asymmetry, or imbalance, of the differential transmission lines over a meshed ground plane causes the differential skew. This study focuses on the angle between the trace of the differential transmission lines and the meshed ground plane to investigate the angle dependence of the differential skew by a simple model. A preliminary evaluation was conducted by analytical estimation of the phase delay difference in the differential transmission lines using the simple model. In a full-wave simulation, it is found that the differential skew does not depend on the position of the differential transmission lines to the pattern of meshed ground and keeps a comparatively small value at the rotation angle around 30°.
Keyword(in Japanese) (See Japanese page)
Keyword(in English) Simple model / Differential transmission lines / Phase delay / Differential skew / Angle dependence / Position dependence
Paper # EMCJ2017-109
Date of Issue 2018-03-09 (EMCJ)

Conference Information
Committee EMCJ / MICT
Conference Date 2018/3/16(1days)
Place (in Japanese) (See Japanese page)
Place (in English) Kikai-Shinko-Kaikan Bldg.
Topics (in Japanese) (See Japanese page)
Topics (in English) EMC
Chair Osami Wada(Kyoto Univ.) / Masaru Sugimachi(National Cerebral and Cardiovascular Center)
Vice Chair Kensei Oh(Nagoya Inst. of Tech.) / Shinsuke Hara(Osaka City Univ.) / Takahiro Aoyagi(Tokyo Inst. of Tech.)
Secretary Kensei Oh(AIST) / Shinsuke Hara(Mitsubishi Electric) / Takahiro Aoyagi(Niigata Univ.)
Assistant Shinichiro Yamamoto(Univ. of Hyogo) / Chie Sasaki(Panasonic) / Shinobu Nagasawa(Mitsubishi Electric) / Takumi Kobayashi(Yokohama National Univ.) / Shintaro Izumi(Kobe Univ.) / Tomoko Tateyama(Hiroshima Inst. of Tech.) / Ami Tanaka(Ritsumeikan Univ.) / Daisuke Anzai(Nagoya Inst. of Tech.)

Paper Information
Registration To Technical Committee on Electromagnetic Compatibility / Technical Committee on Healthcare and Medical Information Communication Technology
Language JPN
Title (in Japanese) (See Japanese page)
Sub Title (in Japanese) (See Japanese page)
Title (in English) Evaluation of Differential Skew Depending on Rotation Angle in Printed Circuit Board with Meshed Ground Plane
Sub Title (in English)
Keyword(1) Simple model
Keyword(2) Differential transmission lines
Keyword(3) Phase delay
Keyword(4) Differential skew
Keyword(5) Angle dependence
Keyword(6) Position dependence
1st Author's Name Chenyu Wang
1st Author's Affiliation Okayama University(Okayama Univ.)
2nd Author's Name Kengo Iokibe
2nd Author's Affiliation Okayama University(Okayama Univ.)
3rd Author's Name Yoshitaka Toyota
3rd Author's Affiliation Okayama University(Okayama Univ.)
Date 2018-03-16
Paper # EMCJ2017-109
Volume (vol) vol.117
Number (no) EMCJ-510
Page pp.pp.25-30(EMCJ),
#Pages 6
Date of Issue 2018-03-09 (EMCJ)