SI and EMI Performance Comparison of Standard QSFP and Flyover QSFP Connectors for 56+ Gbps Applications


In this paper, signal integrity (SI) and EMI aspects of a novel Flyover Quad Small Form Factor Pluggable (Flyover QSFP) connector is compared to a traditional QSFP connector which are used in 28/56 Gb/s applications. The flyover technique can overcome the limitation of high insertion loss associated with standard surface mount QSFP connectors that use PCB Microstrip traces. In flyover QSFP, substituting 7.5 cm PCB traces with 15 cm twin-ax cables results in at least 7 dB insertion loss improvement at 40 GHz. To study the SI and EMI performances of FQSFP in comparison with standard QSFP, two test vehicles were designed, fabricated, and tested. The return loss, insertion loss, and total radiated power (TRP) of both standard QSFP and flyover QSFP connectors are obtained up to 40 GHz. Based on the results, it is shown that flyover QSFP interconnect exhibits better SI performance due to the lower loss in comparison to the standard QSFP. When the same power is applied to both connectors, similar TRP performance is measured at most of the frequencies with differential excitation.

Meeting Name

2017 IEEE International Symposium on Electromagnetic Compatibility & Signal/Power Integrity (2017: Aug. 7-11, Washington, DC)


Electrical and Computer Engineering

Keywords and Phrases

Busbars; Electromagnetic Compatibility; Electromagnetic Pulse; Organic Pollutants; Polychlorinated Biphenyls; Signal Interference (SI); Surface Mount Technology; Flyover QSFP; High Speed; QSFP; Signal Integrity; Total Radiated Power (TRP); Insertion Losses; Electromagnetic Interference (EMI); High-speed Connector; Standard QSFP

International Standard Book Number (ISBN)

978-1-5386-2231-5; 978-1-5386-2229-2

International Standard Serial Number (ISSN)


Document Type

Article - Conference proceedings

Document Version


File Type





© 2017 Institute of Electrical and Electronics Engineers (IEEE), All rights reserved.

Publication Date

01 Aug 2017