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A study of the magnetic dipole moment behavior for a distribution of copper snowballs.

机译：铜雪球分布的磁偶极矩行为研究。

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摘要

Power Loss or the attenuation of signals is a prevalent problem in high-speed circuits, especially at high frequencies. It is the signal integrity Engineer's goal to design a system that will reduce the fatal effects of signal attenuation and thus assure system integrity over a range of frequencies.;In the PCB manufacturing industry, the under-side (bottom surface) of copper foils used as traces or ground layers is typically roughened to provide better adhesion to a dielectric substrate or laminate like FR4.;According to Oak Mitsui engineers in Camden, South Carolina one of the primary copper foil manufacturers for high speed circuits, copper foils typically have to pass a peel test to determine the foil's bonding strength to the dielectric because it plays an important role in the durability of the board. Copper "snowballs" are typically added to create roughness on the underside of the foils; they are thus called anchor nodules because it is harder to peel copper foil away from the adjacent dielectric material if the nodules are present.;Unfortunately, anchor nodules have been shown to jeopardize the integrity of an electromagnetic signal travelling along such traces, as anchor modules contribute to signal attenuation and dispersion.;It is quite intuitive to say that larger anchor modules will greatly influence high surface roughness loss.;As electromagnetic fields that represent signals travel down a trace, the fields scatter from and penetrate into the anchor modules, inducing electric and magnetic dipole moments on the snowballs and causing power to be lost from the signal. It is the focus of this thesis is to study magnetic dipole moments induced in anchor modules or 'snowballs' to better understand how they scatter or absorb as they pass over a distribution of snowball sizes.
机译：功率损耗或信号衰减是高速电路中普遍存在的问题，尤其是在高频下。信号完整性工程师的目标是设计一种系统，以减少信号衰减的致命影响，从而确保在一定频率范围内的系统完整性。在PCB制造行业中，所用铜箔的底面（底面）由于走线或接地层通常会被粗糙化以提供对FR4之类的介电基板或层压板的更好粘附力；;据南卡罗来纳州卡姆登市的Oak Mitsui工程师说，这是高速电路的主要铜箔制造商之一，铜箔通常必须通过剥离测试，以确定箔与电介质的结合强度，因为它在板的耐用性中起着重要作用。通常添加铜“雪球”以在箔的底面产生粗糙度。之所以称它们为锚定结节，是因为如果存在结节，则很难将铜箔从相邻的电介质材料上剥离下来。不幸的是，已显示出锚定结节会破坏沿此类走线传播的电磁信号的完整性，例如锚定模块有助于信号衰减和色散。;直觉地说较大的锚模块将极大地影响高表面粗糙度损失。;当代表信号的电磁场沿迹线传播时，这些电场会从锚模块中散射并渗透到其中，从而引起雪球上的电偶极矩和磁偶极矩会导致信号损失功率。本文的重点是研究锚模块或“雪球”中感应出的磁偶极矩，以更好地了解它们在雪球尺寸分布中经过时如何散射或吸收。

著录项

  • 作者

    Adepetun, Adefisayo (Fisayo).;

  • 作者单位

    University of South Carolina.;

  • 授予单位 University of South Carolina.;
  • 学科 Engineering Electronics and Electrical.
  • 学位 M.S.
  • 年度 2009
  • 页码 71 p.
  • 总页数 71
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 无线电电子学、电信技术;
  • 关键词

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