"Improved" Calculation of reflection coefficient for coaxial antennas with feed gap effect

Peng Wang*, Mark C. Converse, John G. Webster, David M. Mahvi

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


A method is proposed to characterize the reflection coefficient of an insulated coaxial antenna with consideration of the feed gap effect. This method models the insulated antenna as a transmission line and extends the method proposed by Su and Wu [1]. The original model assumed the gap to be small and considered a simple capacitance which is ignored in the calculation. Our improvement to this model is a component added to account for the gap impedance. When using insulated dipoles in medical treatment (hyperthermia, ablation, etc.), optimized antennas may require larger gaps, which this "improved"model accounts for. Excellent agreement is observed between theoretical and numerically simulated S11 data, which indicates that this is an appropriate model for designing an efficient applicator for interstitial microwave hyperthermia.

Original languageEnglish (US)
Pages (from-to)559-563
Number of pages5
JournalIEEE Transactions on Antennas and Propagation
Issue number2
StatePublished - 2009


  • Antenna gap model
  • Coaxial antenna
  • Microwave ablation
  • Microwave hyperthermia
  • Reflection coefficient

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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