Doctoral Dissertations


Sen Yang

Keywords and Phrases

ElectroStatic Discharge; EMC; Harmonic generation; Near field; Passive intermodulation; Passive nonlinearity


"In the first paper, the RF passive harmonic generation phenomenon on the spring contact is studied. A spring contact harmonic generation measurement system is developed. The factors that may have an impact on the spring contact harmonic generation, such as contact material, contact force, and contact resistance are characterized by the measurement system. The gold-to-gold contact is found to be much superior to the stainless-steel contacts. It is also found that the passive nonlinearity at the spring contact is the semiconductor-like junction formed by the surface oxide film.

In the second paper, we show that the maximum E-field coupling occurs at a location slightly offset from the trace center. The E-field coupling to a shielded H-field probe at such a position leads to differential mode coupling which the standard shield of an H-field probe is unable to suppress. The coupling mechanism is investigated and a differential E-field coupling suppression approach is proposed.

In the third paper, a measurement system which uses acoustic vibration to locate passive intermodulation (PIM) sources in base station antennas is presented. This measurement system uses mechanical vibration to modulate the PIM signal. By introducing the acoustic vibration at different locations in the base station antenna and observing if the PIM signal is modulated by the acoustic frequency, the most likely location of the PIM source is identified"--Abstract, page iv.


Pommerenke, David

Committee Member(s)

Fan, Jun, 1971-
Khilkevich, Victor
Hwang, Chulsoon
Fischer, Daniel


Electrical and Computer Engineering

Degree Name

Ph. D. in Electrical Engineering


Missouri University of Science and Technology

Publication Date

Summer 2019

Journal article titles appearing in thesis/dissertation

  • Experimental characterization of the harmonic generation at the spring contact in a mobile device
  • Differential e-field coupling to shielded H-field probe in near-field measurements and a suppression approach
  • A passive intermodulation source identification measurement system using vibration modulation method


xiv, 86 pages

Note about bibliography

Includes bibliographic references.


© 2019 Sen Yang, All rights reserved.

Document Type

Dissertation - Open Access

File Type




Thesis Number

T 11607

Electronic OCLC #