Advanced EM shielding through novel CNT fence wall transfer technology
With the miniaturisation of modern electronic circuits, new circuit and packaging designs must be smaller and lighter whilst encompassing greater functionalities. The high operating frequency within the reduced printed circuit board (PCB) real estate of these new circuits results in problems rela...
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| Other Authors: | |
| Format: | Thesis-Doctor of Philosophy |
| Language: | English |
| Published: |
Nanyang Technological University
2024
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/175989 |
| _version_ | 1811696181535834112 |
|---|---|
| author | Lum, Lucas Yu Xiang |
| author2 | Tay Beng Kang |
| author_facet | Tay Beng Kang Lum, Lucas Yu Xiang |
| author_sort | Lum, Lucas Yu Xiang |
| collection | NTU |
| description | With the miniaturisation of modern electronic circuits, new circuit and
packaging designs must be smaller and lighter whilst encompassing greater
functionalities. The high operating frequency within the reduced printed circuit
board (PCB) real estate of these new circuits results in problems related to
signal integrity. These problems place an enormous pressure on current board
level EM shielding and isolation methods. As such, to maintain the signal
integrity and the electromagnetic (EM) compliance in PCB circuits, modern
shielding and isolation methods face a compromise between their effectiveness
and the amount of real estate they can occupy. One method to tackle the
compromise is through the supplementation of current EM compliance
techniques with a lightweight nanomaterial such as carbon nanotubes (CNTs).
CNTs have been widely used by the industry in the macro scale with proven
performance. However, the widespread micro-scale integration of CNTs has
been met by the inability to integrate at low temperatures and in tight, narrow,
and complex spaces of modern PCBs. Thus, this report aims to develop and
implement an industrially viable, turnkey transfer-application of CNTs as a
board-level electromagnetic shielding and isolation supplementation method.
This work reports an investigation into the anisotropic microwave electronic
properties of vertically aligned CNTs (VACNTs). Free-standing VACNT arrays
were found to be partially anisotropic, displaying varying degrees of lossy
dielectric, and diamagnetic behaviour. A semi-automated method of
transferring VACNTs onto circuit boards was developed, vastly improving the
yield and repeatability of transfer over current methods to allow for the turnkey
v
integration of CNT based board-level EM shielding. VACNT arrays are
transferred onto circuit boards through an optimised process, forming a stable,
electrically conductive bond with a measured low resistivity of 106.25 mΩ ·cm.
With a classical via fence setup, it was shown that an 18 dB improvement in
EM isolation can be obtained together with a decrease in via fence width.
Following this, the improved technique can be used as an application for
VACNT based board-level EM isolation and shielding, implementing isolation
traces onto space-constrained electronic devices to improve their EMC
performance. |
| first_indexed | 2024-10-01T07:35:17Z |
| format | Thesis-Doctor of Philosophy |
| id | ntu-10356/175989 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T07:35:17Z |
| publishDate | 2024 |
| publisher | Nanyang Technological University |
| record_format | dspace |
| spelling | ntu-10356/1759892024-06-03T06:51:19Z Advanced EM shielding through novel CNT fence wall transfer technology Lum, Lucas Yu Xiang Tay Beng Kang School of Electrical and Electronic Engineering Excelitas Technologies Singapore Centre for Micro-/Nano-electronics (NOVITAS) EBKTAY@ntu.edu.sg Engineering Carbon Carbon nanotubes Electromagnetism Electromagnetic compatibility With the miniaturisation of modern electronic circuits, new circuit and packaging designs must be smaller and lighter whilst encompassing greater functionalities. The high operating frequency within the reduced printed circuit board (PCB) real estate of these new circuits results in problems related to signal integrity. These problems place an enormous pressure on current board level EM shielding and isolation methods. As such, to maintain the signal integrity and the electromagnetic (EM) compliance in PCB circuits, modern shielding and isolation methods face a compromise between their effectiveness and the amount of real estate they can occupy. One method to tackle the compromise is through the supplementation of current EM compliance techniques with a lightweight nanomaterial such as carbon nanotubes (CNTs). CNTs have been widely used by the industry in the macro scale with proven performance. However, the widespread micro-scale integration of CNTs has been met by the inability to integrate at low temperatures and in tight, narrow, and complex spaces of modern PCBs. Thus, this report aims to develop and implement an industrially viable, turnkey transfer-application of CNTs as a board-level electromagnetic shielding and isolation supplementation method. This work reports an investigation into the anisotropic microwave electronic properties of vertically aligned CNTs (VACNTs). Free-standing VACNT arrays were found to be partially anisotropic, displaying varying degrees of lossy dielectric, and diamagnetic behaviour. A semi-automated method of transferring VACNTs onto circuit boards was developed, vastly improving the yield and repeatability of transfer over current methods to allow for the turnkey v integration of CNT based board-level EM shielding. VACNT arrays are transferred onto circuit boards through an optimised process, forming a stable, electrically conductive bond with a measured low resistivity of 106.25 mΩ ·cm. With a classical via fence setup, it was shown that an 18 dB improvement in EM isolation can be obtained together with a decrease in via fence width. Following this, the improved technique can be used as an application for VACNT based board-level EM isolation and shielding, implementing isolation traces onto space-constrained electronic devices to improve their EMC performance. Doctor of Philosophy 2024-05-13T02:09:09Z 2024-05-13T02:09:09Z 2023 Thesis-Doctor of Philosophy Lum, L. Y. X. (2023). Advanced EM shielding through novel CNT fence wall transfer technology. Doctoral thesis, Nanyang Technological University, Singapore. https://hdl.handle.net/10356/175989 https://hdl.handle.net/10356/175989 10.32657/10356/175989 en EDB-IPP (Excelitas Technologies Singapore) MOE Tier 2, MOE2018-T2-2-105 This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License (CC BY-NC 4.0). application/pdf Nanyang Technological University |
| spellingShingle | Engineering Carbon Carbon nanotubes Electromagnetism Electromagnetic compatibility Lum, Lucas Yu Xiang Advanced EM shielding through novel CNT fence wall transfer technology |
| title | Advanced EM shielding through novel CNT fence wall transfer technology |
| title_full | Advanced EM shielding through novel CNT fence wall transfer technology |
| title_fullStr | Advanced EM shielding through novel CNT fence wall transfer technology |
| title_full_unstemmed | Advanced EM shielding through novel CNT fence wall transfer technology |
| title_short | Advanced EM shielding through novel CNT fence wall transfer technology |
| title_sort | advanced em shielding through novel cnt fence wall transfer technology |
| topic | Engineering Carbon Carbon nanotubes Electromagnetism Electromagnetic compatibility |
| url | https://hdl.handle.net/10356/175989 |
| work_keys_str_mv | AT lumlucasyuxiang advancedemshieldingthroughnovelcntfencewalltransfertechnology |