Evaluation of the load impedance in coaxial cable via time-frequency domain reflectometry

Yong June Shin, Edward J. Powers, Tok Son Choe, Seung Hoon Sung, Jong Gwan Yook, Jin Bae Park

Research output: Contribution to journalConference articlepeer-review

3 Citations (Scopus)


A new impedance measurement methodology based on time-frequency domain reflectometry (TFDR) is proposed. For the evaluation of the reflection coefficient in time-frequency domain reflectometry, the distortion of the reflected wave by the frequency-dependent attenuation is compensated which otherwise results in inaccurate impedance measurement. Also, the phase difference between the incident and reflected waveforms caused by the state of the load impedance is evaluated by the cross time-frequency distribution which provides time-frequency localized phase difference information. The proposed methodology is verified by a set of numerical electromagnetic simulation experiments and the results are compared with classical time domain reflectometry (TDR). Impedance measurement via time-frequency domain reflectometry is more accurate over a wider range of impedances than TDR.

Original languageEnglish
Pages (from-to)38-46
Number of pages9
JournalProceedings of SPIE - The International Society for Optical Engineering
Publication statusPublished - 2003
EventAdvanced Signal Processing Algorithms, Architectures, and Implementations - San Diego, USA, United States
Duration: 2003 Aug 62003 Aug 8

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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