A Novel RFI Mitigation Method using Source Rotation
This article proposes a novel radio frequency interference (RFI) mitigation method and applies it to a real consumer electronic device. Through near-field scanning, an equivalent dipole moment of the noise source containing the CPU and DDR memory chip is reconstructed. The near-field components of the victim Wi-Fi antenna are measured to obtain the transfer function. By determining the relationship between the dipole moment and the antenna near field, the noise source is rotated by a certain angle to reduce RFI. Rotating the source to reduce RFI is implemented in such a way that it does not compromise the signal integrity, and it does not require an additional shield can. New boards with the suggested changes are fabricated and the measured results show the RFI reduction up to 8 dB compared with the original board.
Q. Huang et al., "A Novel RFI Mitigation Method using Source Rotation," IEEE Transactions on Electromagnetic Compatibility, vol. 63, no. 1, pp. 11-18, article no. 9109566, Institute of Electrical and Electronics Engineers (IEEE), Feb 2021.
The definitive version is available at https://doi.org/10.1109/TEMC.2020.2995828
Electrical and Computer Engineering
Keywords and Phrases
Antenna; Dipole Moment Model; Double Data Rate (DDR); Radio Frequency Interference (RFI); Reciprocity; Transfer Function
International Standard Serial Number (ISSN)
Article - Journal
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01 Feb 2021