DC25_PAPER_TRACK13_InsertionLossOfMechanicallyRoughened_Steinberger.pdf

1、 Insertion Loss of Mechanically Roughened Conductors Mike Steinberger,MathWorks Michael Tsuk,MathWorks Orlando Bell,GigaTest Labs Abstract Two hypotheses have been offered to explain the excess insertion loss of transmission lines in printed circuit boards.According to the conductor roughness hypoth

2、esis,surface irregularities make the electrons propagation path longer.According to the lossy dielectric hypothesis the insertion loss is increased when the conductor surface is coated by a very thin layer of very lossy dielectric.Measured data presented at DesignCon 2016 demonstrated that electropl

3、ated copper introduced excess insertion loss whereas rolled copper did not.However,that data does not fully close the question because when rolled copper is processed into a printed circuit board there is an increase in insertion loss,caused by some combination of increasing the conductors surface r

4、oughness and exposing the conductor to chemical processes.This paper offers a definitive evaluation of the conductor roughness hypothesis by measuring the loss of striplines that have not been exposed to any form of chemical process in any step of their fabrication.The experimental baseline uses unm

5、odified rolled copper,while other conductors use rolled copper processed with knurled rollers,resulting in a regular repeating pattern with a peak-to-peak variation of over 300 microns.Author(s)Biography Michael Steinberger,Ph.D.Consultant Software Engineer,MathWorks.Dr.Steinberger has over 30 years

6、 of experience designing very high-speed electronic circuits.He holds a Ph.D.from the University of Southern California and has been awarded 14 patents.Dr.Steinberger was DesignCons 2015 Engineer of the Year.He is currently responsible for the behavioral modeling of mixed analog and digital circuits