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

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

doi:10.1109/TAP.2008.2011411

"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

Surgery, Surgical Oncology Division

Research output: Contribution to journal › Article › peer-review

7 Scopus citations

Abstract

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 language	English (US)
Pages (from-to)	559-563
Number of pages	5
Journal	IEEE Transactions on Antennas and Propagation
Volume	57
Issue number	2
DOIs	https://doi.org/10.1109/TAP.2008.2011411
State	Published - 2009

Keywords

Antenna gap model
Coaxial antenna
Microwave ablation
Microwave hyperthermia
Reflection coefficient

ASJC Scopus subject areas

Electrical and Electronic Engineering

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10.1109/TAP.2008.2011411

Cite this

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title = "{"}Improved{"} Calculation of reflection coefficient for coaxial antennas with feed gap effect",

abstract = "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.",

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language = "English (US)",

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pages = "559--563",

journal = "IEEE Transactions on Antennas and Propagation",

issn = "0018-926X",

publisher = "Institute of Electrical and Electronics Engineers Inc.",

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TY - JOUR

T1 - "Improved" Calculation of reflection coefficient for coaxial antennas with feed gap effect

AU - Wang, Peng

AU - Converse, Mark C.

AU - Webster, John G.

AU - Mahvi, David M.

PY - 2009

Y1 - 2009

N2 - 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.

AB - 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.

KW - Antenna gap model

KW - Coaxial antenna

KW - Microwave ablation

KW - Microwave hyperthermia

KW - Reflection coefficient

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JO - IEEE Transactions on Antennas and Propagation

JF - IEEE Transactions on Antennas and Propagation

IS - 2

ER -

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

Abstract

Keywords

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