Antenna Analysis and Design Using Stored Energies and Physical Limitations

Marius Cismasu

Antenna Analysis and Design Using Stored Energies and Physical Limitations

Marius Cismasu

Department of Electrical and Information Technology

Research output: Thesis › Doctoral Thesis (compilation)

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Abstract

A method to estimate Q and QZ' of antennas from single-frequency current distributions is described. This single-frequency method and the concepts of physical bounds on antenna parameters and optimum current distributions are applied to different analysis and design situations of two-dimensional and three-dimensional radiating structures (i.e., antennas). The situations considered are: antenna optimization using a genetic algorithm and the single-frequency Q computation for single or multi-band operation, antenna placement optimization in a wireless device using physical bounds, and antenna optimization that includes QZ' in the objective function. Antenna performance is compared with physical bounds or optimum-current performance in the situations studied.

The results presented in this thesis suggest that single-frequency methods may reduce the time necessary to optimize automatically, e.g., using a computer, some antenna parameters such as bandwidth. Furthermore, physical bounds and optimum current distributions are tools that provide valuable information for the processes of antenna analysis and design.

Original language	English
Qualification	Doctor
Awarding Institution	Department of Electrical and Information Technology
Supervisors/Advisors	Gustafsson, Mats, Supervisor
Award date	2014 Oct 27
Publication status	Published - 2014

Bibliographical note

Defence details

Date: 2014-10-27
Time: 10:15
Place: Lecture hall E:1406, E-building, Ole Römers väg 3, Lund University Faculty of Engineering

External reviewer(s)

Name: Skrivervik, Anja
Title: Professor
Affiliation: École polytechnique fédérale de Lausanne, Switzerland

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Subject classification (UKÄ)

Electrical Engineering, Electronic Engineering, Information Engineering

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title = "Antenna Analysis and Design Using Stored Energies and Physical Limitations",

abstract = "A method to estimate Q and QZ' of antennas from single-frequency current distributions is described. This single-frequency method and the concepts of physical bounds on antenna parameters and optimum current distributions are applied to different analysis and design situations of two-dimensional and three-dimensional radiating structures (i.e., antennas). The situations considered are: antenna optimization using a genetic algorithm and the single-frequency Q computation for single or multi-band operation, antenna placement optimization in a wireless device using physical bounds, and antenna optimization that includes QZ' in the objective function. Antenna performance is compared with physical bounds or optimum-current performance in the situations studied. The results presented in this thesis suggest that single-frequency methods may reduce the time necessary to optimize automatically, e.g., using a computer, some antenna parameters such as bandwidth. Furthermore, physical bounds and optimum current distributions are tools that provide valuable information for the processes of antenna analysis and design.",

author = "Marius Cismasu",

note = "Defence details Date: 2014-10-27 Time: 10:15 Place: Lecture hall E:1406, E-building, Ole R{\"o}mers v{\"a}g 3, Lund University Faculty of Engineering External reviewer(s) Name: Skrivervik, Anja Title: Professor Affiliation: {\'E}cole polytechnique f{\'e}d{\'e}rale de Lausanne, Switzerland ---",

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language = "English",

school = "Department of Electrical and Information Technology",

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TY - THES

T1 - Antenna Analysis and Design Using Stored Energies and Physical Limitations

AU - Cismasu, Marius

N1 - Defence details Date: 2014-10-27 Time: 10:15 Place: Lecture hall E:1406, E-building, Ole Römers väg 3, Lund University Faculty of Engineering External reviewer(s) Name: Skrivervik, Anja Title: Professor Affiliation: École polytechnique fédérale de Lausanne, Switzerland ---

PY - 2014

Y1 - 2014

N2 - A method to estimate Q and QZ' of antennas from single-frequency current distributions is described. This single-frequency method and the concepts of physical bounds on antenna parameters and optimum current distributions are applied to different analysis and design situations of two-dimensional and three-dimensional radiating structures (i.e., antennas). The situations considered are: antenna optimization using a genetic algorithm and the single-frequency Q computation for single or multi-band operation, antenna placement optimization in a wireless device using physical bounds, and antenna optimization that includes QZ' in the objective function. Antenna performance is compared with physical bounds or optimum-current performance in the situations studied. The results presented in this thesis suggest that single-frequency methods may reduce the time necessary to optimize automatically, e.g., using a computer, some antenna parameters such as bandwidth. Furthermore, physical bounds and optimum current distributions are tools that provide valuable information for the processes of antenna analysis and design.

AB - A method to estimate Q and QZ' of antennas from single-frequency current distributions is described. This single-frequency method and the concepts of physical bounds on antenna parameters and optimum current distributions are applied to different analysis and design situations of two-dimensional and three-dimensional radiating structures (i.e., antennas). The situations considered are: antenna optimization using a genetic algorithm and the single-frequency Q computation for single or multi-band operation, antenna placement optimization in a wireless device using physical bounds, and antenna optimization that includes QZ' in the objective function. Antenna performance is compared with physical bounds or optimum-current performance in the situations studied. The results presented in this thesis suggest that single-frequency methods may reduce the time necessary to optimize automatically, e.g., using a computer, some antenna parameters such as bandwidth. Furthermore, physical bounds and optimum current distributions are tools that provide valuable information for the processes of antenna analysis and design.

M3 - Doctoral Thesis (compilation)

ER -

Antenna Analysis and Design Using Stored Energies and Physical Limitations

Abstract

Bibliographical note

Subject classification (UKÄ)

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