Antenna Analysis and Design Using Stored Energies and Physical Limitations

Summary, in English

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
• Department/s: Department of Electrical and Information Technology
• Publishing year: 2014
• Language: English
• Full text: - 3 MB; Download statistics
• Document type: Dissertation
• Topic: Electrical Engineering, Electronic Engineering, Information Engineering
• Status: Published
• Research group: Electromagnetic theory
• Supervisor: Mats Gustafsson
• Defence date: 27 October 2014
• Defence time: 10:15
• Defence place: Lecture hall E:1406, E-building, Ole Römers väg 3, Lund University Faculty of Engineering
• Opponent: Anja Skrivervik (Professor)