Spectrum Analyzer-Based Phase Measurement for Near-Field EMI Scanning

Shubhankar Marathe*, Zongyi Chen, Kaustav Ghosh, Hamed Kajbaf, Stephan Frei, Morten Sorensen, David Johannes Pommerenke, Jin Min

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


Often, electromagnetic interference (EMI) scanning applications require phase and magnitude information for the creation of equivalent radiation models and far-field predictions. Magnitude information can be obtained using a spectrum analyzer (SA), which is relatively inexpensive compared to phase resolving instruments such as vector network analyzers (VNAs) and oscilloscopes at tens of GHz. This paper introduces and optimizes a cost-effective SA-based phase measurement method and compares the results to a VNA and oscilloscope-based methods for EMI signal sources. The measured-phase distribution obtained from the three different instruments is additionally compared with the simulated phase determined from full-wave simulation. The three measurement methods are compared based on the type of signal spectrum to be measured, such as single or multiple frequencies, signals requiring low-resolution bandwidth measurements, or transient signal events. The SA-based phase measurement technique is designed to operate from 5 to 12 GHz. However, the system frequency bandwidth is limited only by the frequency bandwidth of the individual RF components used in the SA measurement system
Original languageEnglish
Article number8743430
Pages (from-to)848 - 858
Number of pages11
JournalIEEE Transactions on Electromagnetic Compatibility
Issue number3
Publication statusPublished - Jun 2020
Externally publishedYes


  • Electromagnetic interference (EMI)
  • near-field measurements
  • oscilloscope
  • phase-resolved measurements
  • probes
  • spectrum analyzer (SA)
  • vector network analyzer (VNA)

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering


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