Radiation Physics and Design Guidelines of High-Speed Connectors

High-speed connectors contribute to system-level electromagnetic interference (EMI). Radiation from antenna-mode current and transmission-line (TL)-mode current is briefly reviewed with a backplane connector and an optical cage connector. The radiation from the high-speed connector with TL-mode current is analyzed in detail. The possible radiation mechanisms are analyzed respectively through Green's function method, steepest descent method, and electromagnetic compatibility studio method of moment. Design guidelines of high-speed connectors for EMI mitigation are proposed based on the analysis of radiation physics.

[1]  Pingfang Yu,et al.  The EMI characteristics of High Speed backplane connector , 2012, International Symposium on Electromagnetic Compatibility - EMC EUROPE.

[2]  Jun Fan,et al.  EMI Coupling Paths and Mitigation in a Board-to-Board Connector , 2015, IEEE Transactions on Electromagnetic Compatibility.

[3]  Jinghan Yu,et al.  An analytical approximation for evaluating impact of skew length on radiated emission from differential signal pairs , 2012, 2012 Asia-Pacific Symposium on Electromagnetic Compatibility.

[4]  R. Koga,et al.  Prediction of the common-mode radiated emission from the board to board interconnection through common-mode antenna model , 2008, 2008 IEEE International Symposium on Electromagnetic Compatibility.

[5]  H. Toki,et al.  Multiconductor Transmission-Line Theory with Electromagnetic Radiation , 2012 .

[6]  Kengo Iokibe.  Mode-equivalent Modelling of System Consisting of Transmission Lines with Different Imbalance Factors , 2011 .

[7]  M. Leone,et al.  Closed-Form Expressions for the Electromagnetic Radiation of Microstrip Signal Traces , 2007, IEEE Transactions on Electromagnetic Compatibility.

[8]  C. Christopoulos,et al.  Prediction of radiation losses and emission from a bent wire by a network model , 2006, IEEE Transactions on Electromagnetic Compatibility.

[9]  Masashi Hayakawa,et al.  A study on the radiation loss from a bent transmission line , 2001 .

[10]  S. Yokokawa,et al.  transmission and radiation properties of a surface wave transmission line with a bend , 1994 .

[12]  J.B. Nitsch,et al.  Complex-valued transmission-line parameters and their relation to the radiation resistance , 2004, IEEE Transactions on Electromagnetic Compatibility.

[13]  Y. Kayano,et al.  Identifying EM radiation from asymmetrical differential-paired lines with equi-distance routing , 2012, 2012 IEEE International Symposium on Electromagnetic Compatibility.

[14]  K. K. Mei,et al.  Generalized non-uniform transmission-line models for local radiation from microstrip bends in MMICs , 2003 .

[15]  M. Leone,et al.  On the electromagnetic radiation of printed-circuit-board interconnections , 2005, IEEE Transactions on Electromagnetic Compatibility.

[16]  L.K.C. Wong.  Backplane Connector Radiated Emission And Shielding Effectiveness , 1992, International Symposium on Electromagnetic Compatibility.

[17]  A. Maffucci,et al.  An enhanced transmission line model for conducting wires , 2004, IEEE Transactions on Electromagnetic Compatibility.

[18]  Tetsushi Watanabe,et al.  Common-Mode-Current Generation Caused by Difference of Unbalance of Transmission Lines on a Printed Circuit Board with Narrow Ground Pattern , 2000 .

[19]  T. Nakamura,et al.  Radiation from the transmission line with an acute bend , 1995 .

[20]  M.Z.M. Jenu,et al.  Magnetic and electric field radiation of bent microstrip line using Hertzian dipole method , 2008, 2008 IEEE International RF and Microwave Conference.

[21]  T. H. Hubing,et al.  Investigation of the imbalance difference model and its application to various circuit board and cable geometries , 2012, 2012 IEEE International Symposium on Electromagnetic Compatibility.

[22]  Tzong-Lin Wu,et al.  The effect of various skew compensation strategies on mode conversion and radiation from high-speed connectors , 2013, 2013 IEEE International Symposium on Electromagnetic Compatibility.

[23]  Wei-Da Guo,et al.  Noise reduction using compensation capacitance for bend discontinuities of differential transmission lines , 2006, IEEE Transactions on Advanced Packaging.

[24]  F. Rachidi,et al.  On the Evaluation of Antenna-Mode Currents Along Transmission Lines , 2006, IEEE Transactions on Electromagnetic Compatibility.

[25]  Yee See Khee,et al.  Radiated emission of bent microstrip line using Hertzian dipole method , 2008, 2008 IEEE International Symposium on Electromagnetic Compatibility.

[26]  Bruce Archambeault,et al.  EM emission of differential signals across connected printed circuit boards in the GHz range , 2009, 2009 IEEE International Symposium on Electromagnetic Compatibility.

[27]  Yoshitaka Toyota,et al.  Prediction of electromagnetic emissions from PCBs with interconnections through common-mode antenna model , 2007, 2007 18th International Zurich Symposium on Electromagnetic Compatibility.

[28]  Jun-Fa Mao,et al.  Slow-wave structure to suppress differential-to-common mode conversion for bend discontinuity of differential signaling , 2012, 2012 IEEE Electrical Design of Advanced Packaging and Systems Symposium (EDAPS).

[29]  T. Sarkar,et al.  Analysis of Multiconductor Transmission Lines , 1988, 31st ARFTG Conference Digest.

[30]  Clayton R. Paul.  A comparison of the contributions of common-mode and differential-mode currents in radiated emissions , 1989 .

[31]  K. Lee,et al.  Two Parallel Terminated Conductors in External Fields , 1978, IEEE Transactions on Electromagnetic Compatibility.

[32]  Xinxin Tian,et al.  Modeling electromagnetic radiation at high-density PCB/connector interfaces , 2014, 2014 IEEE International Symposium on Electromagnetic Compatibility (EMC).

[33]  Jun-Fa Mao,et al.  Slow-wave structure to suppress differential-to-common mode conversion for bend discontinuity of differential signaling , 2012 .

[34]  Changyi Su,et al.  Imbalance Difference Model for Common-Mode Radiation From Printed Circuit Boards , 2011, IEEE Transactions on Electromagnetic Compatibility.

[35]  James L. Drewniak,et al.  Electromagnetic Radiation Resulting From PCB/High-Density Connector Interfaces , 2013, IEEE Transactions on Electromagnetic Compatibility.

[36]  B. Archambeault,et al.  EMI Emissions from mismatches in High Speed Differential Signal Traces and Cables , 2007, 2007 IEEE International Symposium on Electromagnetic Compatibility.

[37]  Y.W. Liu,et al.  Radiation extraction for transmission-line interconnects , 2001, IEEE Antennas and Propagation Society International Symposium. 2001 Digest. Held in conjunction with: USNC/URSI National Radio Science Meeting (Cat. No.01CH37229).