Practical design methodology of mode-conversion-free tightly coupled asymmetrically tapered bend for high-density differential wiring

Research output: Contribution to journalArticlepeer-review

Abstract

The plain bend in a pair of differential transmission lines causes a path difference, which leads to differential-to-common mode conversion due to the phase difference. This conversion can cause serious common-mode noise issues. We previously proposed a tightly coupled asymmetrically tapered bend to suppress forward differential-to-common mode conversion and derived the constraint conditions for high-density wiring. To provide sufficient suppression of mode conversion, however, the additional correction was required to make the effective path difference vanish. This paper proposes a practical and straightforward design methodology by using a very tightly coupled bend (decreasing the line width and the line separation of the tightly coupled bend). Full-wave simulations below 20 GHz demonstrated that sufficient suppression of the forward differential-to-common mode conversion is successfully achieved as designed. Measurements showed that our design methodology is effective.

Original languageEnglish
Pages (from-to)304-311
Number of pages8
JournalIEICE Transactions on Communications
VolumeE104B
Issue number3
DOIs
Publication statusPublished - Mar 1 2021

Keywords

  • Asymmetric tapers
  • Design methodology
  • Differential transmission lines
  • High-density wiring
  • Mode-conversion

ASJC Scopus subject areas

  • Software
  • Computer Networks and Communications
  • Electrical and Electronic Engineering

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