Antenna Analysis and Design Using Stored Energies and Physical Limitations

Marius Cismasu

Research output: ThesisDoctoral Thesis (compilation)

501 Downloads (Pure)


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 languageEnglish
Awarding Institution
  • Department of Electrical and Information Technology
  • Gustafsson, Mats, Supervisor
Award date2014 Oct 27
Publication statusPublished - 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


Subject classification (UKÄ)

  • Electrical Engineering, Electronic Engineering, Information Engineering


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