Masters Theses


Liang Li

Keywords and Phrases

Global Optimization; Least-square; Near-field Scanning; Noise Source Modeling; Reciprocity; Regularization; SVD


"With increasing complexities and shrinking size of modern electronic devices, the near-field RF interference issues are becoming challenging for RF-digital mixed circuit design. Predicting the coupling from digital module to RF antennas and mitigating RF interference is important to the system performance. The ultimate goal of this study is to address the desensitization issues existing in modern electronic devices that have mixed high speed digital-RF circuits, such as cellphone and wearable devices.

In order to estimate the near-field noise coupling from digital module to RF antennas, the noise source is anticipated to be replaced by its equivalent radiation model which can facilitate the near-field coupling analysis. This thesis focuses on modeling of radiation noise source and its application in RF interference applications. Two methods are proposed, equivalent dipole moment model and Huygens's equivalent model. The methodology of both methods will be introduced and later validated with full-wave simulation and measurement. Dipole moment model is extracted by Least-square and improved with global optimization, while Huygens's equivalent model is constructed in full-wave simulation tool.

With equivalent noise source model, the near-field coupling between radiation noise source and RF antennas are estimated by either direct simulation or reciprocity theorem. Field data is obtained by near-field scanning with phase information. Measurement data shows good correlation and consistence for noise source modeling and near-field coupling"--Abstract, page iii.


Fan, Jun, 1971-

Committee Member(s)

Pommerenke, David
Beetner, Daryl G.


Electrical and Computer Engineering

Degree Name

M.S. in Electrical Engineering


Missouri University of Science and Technology

Publication Date

Summer 2016


ix, 67 pages

Note about bibliography

Includes bibliographical references (pages 64-66).


© 2016 Liang Li, All rights reserved.

Document Type

Thesis - Open Access

File Type




Subject Headings

Near-fields -- Measurement
Radio -- Interference
Dipole moments

Thesis Number

T 10963

Electronic OCLC #