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Radiated emissions of electrically long PCB based on imbalance difference and dipole antenna models

Yahya Sayegh, Ahmed Mohammed (2017) Radiated emissions of electrically long PCB based on imbalance difference and dipole antenna models. PhD thesis, Universiti Tun Hussein Onn Malaysia.


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Radiated emission (RE) compliance is one of the most important requirements for legal and global marketing of electronic devices. Conventionally, REs are quantified using full wave numerical simulations or measurement in semi-anechoic chambers (SAC). However, these methods are expensive and time-consuming. Thus, they are not suitable for early prediction of RE. This thesis proposes novel analytical methods for estimating RE of printed circuit board (PCB) attached with cables at the design stage for time and cost saving. First, a novel analytical method has been introduced to estimate the RE from electrically long PCB traces based on transmission-line (TL) theory, imbalance difference model (IDM), travelling wave antenna (TWA) and dipole antenna model. However, this proposed method is limited to PCB-traces with Quasi-TEM (QTEM) current distribution. Therefore, artificial neural network (ANN) model has been constructed and trained using backpropagation algorithm for estimating the RE from electrically long traces beyond Quasi-TEM operation mode. Secondly, a novel analytical method was developed to estimate the common mode RE from cables attached to a PCB-trace by adopting the IDM in conjunction with asymmetrical dipole antenna model. The effectiveness of the proposed methods was verified by comparing the predicted results to both 3D HFSS simulation and measurement results. The results obtained using the proposed methods were in a good agreements with both HFSS simulation results and measurement results with accuracy of ±3dB which is acceptable range from design point of view. Finally, graphical user interface (GUI) was developed which would be useful for early prediction of RE in the electronics industry. These GUIs can be enhanced in future to characterize automatically the RE from the entire PCB.

Item Type: Thesis (PhD)
Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK7800-8360 Electronics
Depositing User: Mr. Mohammad Shaifulrip Ithnin
Date Deposited: 06 May 2018 08:33
Last Modified: 06 May 2018 08:33
URI: http://eprints.uthm.edu.my/id/eprint/9992
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