UseoftheSPPTechnique toAccount forInhomogeneities inDifferential Printed-Circuit- Board Wiring

usedtoday, result inverysmallspacings of4-7mil, for Theshort-pulse propagation (SPP) time-domain technique example, on typical printed-circuitboard boards, whilethe Theshornt-pueablse popeagyatiountP time-nomaintehniues weavecould haveapitch intherange of14-32mil[1]. Asa iSshowntobeabletoeasily account fortheinhomogeneities cosqee,tefbrwlbephdoufomheegn foundintypical printed-circuit-board wiring. SPPisusedto generate broadband predictive modelsfordifferential linesbetween thewires andthis willleave mostly epoxy-resin. The withdifferent glass-fiber-to-epoxy-resin ratios andalso forthe overall structure isthenquite inhomogeneous. soldermask layers usedontopandbottom oftypical boards. Inthispaper, a methodology isshownforcreating Inbothcases, atwo-step extraction procedure isemployed to broadband wiringmodelsforinhomogeneous differential obtainthe broadbandcomplex permittivity forthe structures using theshort-pulse-prop agation,