Coupling between transmission-line networks and homogeneous media: A semianalytical approach

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4 Citations (Scopus)

Abstract

Electromagnetic devices that incorporate volumetric networks of transmission lines with electrically small periodicity and cross-sections are extensively used in various applications. Linear tapers can be employed in these configurations to achieve coupling between a homogeneous background medium and the volumetric transmission-line structure. This is beneficial since various transmission-line structures (homogenizable dense networks of transmission lines) are widely utilized to realize exotic electromagnetic properties commonly related to metamaterials. However, optimizing the dimensions of such multiparametric and electrically large devices could be computationally cumbersome. In this work, a simple semianalytic technique is proposed to reduce substantially the required simulation cost for an optimized design. The tapers are modeled semianalytically as consecutive coplanar components. On the other hand, the transmission-line network is considered as a chain of identical unit cells, the response of which is numerically determined. The semianalytical result of the taper is combined with the numerical result of the unit cell by cascading the respective transfer matrices. The agreement of the obtained results with the corresponding full-wave simulation data of the whole structure is very good. The decreased computational time required for the proposed approach is demonstrated through several numerical examples.

Original languageEnglish
Pages (from-to)318-327
Number of pages10
JournalInternational Journal of RF and Microwave Computer-Aided Engineering
Volume23
Issue number3
DOIs
Publication statusPublished - May 2013
Externally publishedYes

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Electric lines
Metamaterials
Costs

Keywords

  • cloaking
  • coupling
  • dimension optimization
  • linear taper
  • semianalytical approximation
  • transmission-line network

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Computer Graphics and Computer-Aided Design
  • Computer Science Applications

Cite this

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title = "Coupling between transmission-line networks and homogeneous media: A semianalytical approach",
abstract = "Electromagnetic devices that incorporate volumetric networks of transmission lines with electrically small periodicity and cross-sections are extensively used in various applications. Linear tapers can be employed in these configurations to achieve coupling between a homogeneous background medium and the volumetric transmission-line structure. This is beneficial since various transmission-line structures (homogenizable dense networks of transmission lines) are widely utilized to realize exotic electromagnetic properties commonly related to metamaterials. However, optimizing the dimensions of such multiparametric and electrically large devices could be computationally cumbersome. In this work, a simple semianalytic technique is proposed to reduce substantially the required simulation cost for an optimized design. The tapers are modeled semianalytically as consecutive coplanar components. On the other hand, the transmission-line network is considered as a chain of identical unit cells, the response of which is numerically determined. The semianalytical result of the taper is combined with the numerical result of the unit cell by cascading the respective transfer matrices. The agreement of the obtained results with the corresponding full-wave simulation data of the whole structure is very good. The decreased computational time required for the proposed approach is demonstrated through several numerical examples.",
keywords = "cloaking, coupling, dimension optimization, linear taper, semianalytical approximation, transmission-line network",
author = "Valagiannopoulos, {Constantinos A.} and Pekka Alitalo",
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T1 - Coupling between transmission-line networks and homogeneous media

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AU - Valagiannopoulos, Constantinos A.

AU - Alitalo, Pekka

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N2 - Electromagnetic devices that incorporate volumetric networks of transmission lines with electrically small periodicity and cross-sections are extensively used in various applications. Linear tapers can be employed in these configurations to achieve coupling between a homogeneous background medium and the volumetric transmission-line structure. This is beneficial since various transmission-line structures (homogenizable dense networks of transmission lines) are widely utilized to realize exotic electromagnetic properties commonly related to metamaterials. However, optimizing the dimensions of such multiparametric and electrically large devices could be computationally cumbersome. In this work, a simple semianalytic technique is proposed to reduce substantially the required simulation cost for an optimized design. The tapers are modeled semianalytically as consecutive coplanar components. On the other hand, the transmission-line network is considered as a chain of identical unit cells, the response of which is numerically determined. The semianalytical result of the taper is combined with the numerical result of the unit cell by cascading the respective transfer matrices. The agreement of the obtained results with the corresponding full-wave simulation data of the whole structure is very good. The decreased computational time required for the proposed approach is demonstrated through several numerical examples.

AB - Electromagnetic devices that incorporate volumetric networks of transmission lines with electrically small periodicity and cross-sections are extensively used in various applications. Linear tapers can be employed in these configurations to achieve coupling between a homogeneous background medium and the volumetric transmission-line structure. This is beneficial since various transmission-line structures (homogenizable dense networks of transmission lines) are widely utilized to realize exotic electromagnetic properties commonly related to metamaterials. However, optimizing the dimensions of such multiparametric and electrically large devices could be computationally cumbersome. In this work, a simple semianalytic technique is proposed to reduce substantially the required simulation cost for an optimized design. The tapers are modeled semianalytically as consecutive coplanar components. On the other hand, the transmission-line network is considered as a chain of identical unit cells, the response of which is numerically determined. The semianalytical result of the taper is combined with the numerical result of the unit cell by cascading the respective transfer matrices. The agreement of the obtained results with the corresponding full-wave simulation data of the whole structure is very good. The decreased computational time required for the proposed approach is demonstrated through several numerical examples.

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KW - coupling

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KW - linear taper

KW - semianalytical approximation

KW - transmission-line network

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