Suppression of Mode Conversion by Using Tightly Coupled Asymmetrically Tapered Bend in Differential Lines

Yoshitaka TOYOTA; Shohei KAN; Kengo IOKIBE

doi:10.1587/transcom.E98.B.1188

Suppression of Mode Conversion by Using Tightly Coupled Asymmetrically Tapered Bend in Differential Lines

Yoshitaka TOYOTA, Shohei KAN, Kengo IOKIBE

Full Text Views

0

Share
Cite this

Summary :

In this paper, we propose a tightly coupled asymmetrically tapered bend to suppress differential-to-common mode conversion caused by bend discontinuity in a pair of differential lines. Tightly coupled symmetrically tapered bends have been so far proposed to suppress the mode conversion by decreasing the path difference in the bend. This approach makes the path difference shorter so that the differential lines are coupled more tightly but the path difference of twice the sum of the line width and the line separation still remains. To suppress the remaining path difference, this paper introduces the use of asymmetric tapers. In addition, two-section tapers are applied to reduce differential-mode reflection increased by the tapers and hence improve differential-mode propagation. A full-wave simulation of a right-angled bend demonstrates that the forward differential-to-common mode conversion is decreased by almost 30 dB compared to the symmetrically tapered bend and that the differential-mode reflection coefficient is reduced to the same amount as that of the classic bend. Also, the generality of the proposed bend structure is discussed.

Publication: IEICE TRANSACTIONS on Communications Vol.E98-B No.7 pp.1188-1195

Publication Date: 2015/07/01

Publicized

Online ISSN: 1745-1345

DOI: 10.1587/transcom.E98.B.1188

Type of Manuscript: Special Section PAPER (Special Section on Electromagnetic Compatibility Technology in Conjunction with Main Topics of EMC'14/Tokyo)

Category

Authors

Yoshitaka TOYOTA
  Okayama University
Shohei KAN
  Okayama University
Kengo IOKIBE
  Okayama University

Keyword

differential lines, tightly coupled bend, mode conversion, asymmetric tapers

Cite this

Copy

Yoshitaka TOYOTA, Shohei KAN, Kengo IOKIBE, "Suppression of Mode Conversion by Using Tightly Coupled Asymmetrically Tapered Bend in Differential Lines" in IEICE TRANSACTIONS on Communications, vol. E98-B, no. 7, pp. 1188-1195, July 2015, doi: 10.1587/transcom.E98.B.1188.
Abstract: In this paper, we propose a tightly coupled asymmetrically tapered bend to suppress differential-to-common mode conversion caused by bend discontinuity in a pair of differential lines. Tightly coupled symmetrically tapered bends have been so far proposed to suppress the mode conversion by decreasing the path difference in the bend. This approach makes the path difference shorter so that the differential lines are coupled more tightly but the path difference of twice the sum of the line width and the line separation still remains. To suppress the remaining path difference, this paper introduces the use of asymmetric tapers. In addition, two-section tapers are applied to reduce differential-mode reflection increased by the tapers and hence improve differential-mode propagation. A full-wave simulation of a right-angled bend demonstrates that the forward differential-to-common mode conversion is decreased by almost 30 dB compared to the symmetrically tapered bend and that the differential-mode reflection coefficient is reduced to the same amount as that of the classic bend. Also, the generality of the proposed bend structure is discussed.
URL: https://globals.ieice.org/en_transactions/communications/10.1587/transcom.E98.B.1188/_p

Copy

@ARTICLE{e98-b_7_1188,
author={Yoshitaka TOYOTA, Shohei KAN, Kengo IOKIBE, },
journal={IEICE TRANSACTIONS on Communications},
title={Suppression of Mode Conversion by Using Tightly Coupled Asymmetrically Tapered Bend in Differential Lines},
year={2015},
volume={E98-B},
number={7},
pages={1188-1195},
abstract={In this paper, we propose a tightly coupled asymmetrically tapered bend to suppress differential-to-common mode conversion caused by bend discontinuity in a pair of differential lines. Tightly coupled symmetrically tapered bends have been so far proposed to suppress the mode conversion by decreasing the path difference in the bend. This approach makes the path difference shorter so that the differential lines are coupled more tightly but the path difference of twice the sum of the line width and the line separation still remains. To suppress the remaining path difference, this paper introduces the use of asymmetric tapers. In addition, two-section tapers are applied to reduce differential-mode reflection increased by the tapers and hence improve differential-mode propagation. A full-wave simulation of a right-angled bend demonstrates that the forward differential-to-common mode conversion is decreased by almost 30 dB compared to the symmetrically tapered bend and that the differential-mode reflection coefficient is reduced to the same amount as that of the classic bend. Also, the generality of the proposed bend structure is discussed.},
keywords={},
doi={10.1587/transcom.E98.B.1188},
ISSN={1745-1345},
month={July},}

Copy

TY - JOUR
TI - Suppression of Mode Conversion by Using Tightly Coupled Asymmetrically Tapered Bend in Differential Lines
T2 - IEICE TRANSACTIONS on Communications
SP - 1188
EP - 1195
AU - Yoshitaka TOYOTA
AU - Shohei KAN
AU - Kengo IOKIBE
PY - 2015
DO - 10.1587/transcom.E98.B.1188
JO - IEICE TRANSACTIONS on Communications
SN - 1745-1345
VL - E98-B
IS - 7
JA - IEICE TRANSACTIONS on Communications
Y1 - July 2015
AB - In this paper, we propose a tightly coupled asymmetrically tapered bend to suppress differential-to-common mode conversion caused by bend discontinuity in a pair of differential lines. Tightly coupled symmetrically tapered bends have been so far proposed to suppress the mode conversion by decreasing the path difference in the bend. This approach makes the path difference shorter so that the differential lines are coupled more tightly but the path difference of twice the sum of the line width and the line separation still remains. To suppress the remaining path difference, this paper introduces the use of asymmetric tapers. In addition, two-section tapers are applied to reduce differential-mode reflection increased by the tapers and hence improve differential-mode propagation. A full-wave simulation of a right-angled bend demonstrates that the forward differential-to-common mode conversion is decreased by almost 30 dB compared to the symmetrically tapered bend and that the differential-mode reflection coefficient is reduced to the same amount as that of the classic bend. Also, the generality of the proposed bend structure is discussed.
ER -