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Antenna Analysis and Design Using Stored Energies and Physical Limitations

Cismasu, Marius LU (2014)
Abstract (Swedish)
Popular Abstract in Swedish

Antenner finns idag nästan överallt: i mobiltelefoner, bärbara datorer, surfplattor, kameror, skrivare, klockor och armbandsur, o.s.v. De används för att överföra information trådlöst mellan enheter med hjälp av elektromagnetiska vågor (som har egenskapen att utbreda sig, ungefär på samma sätt som vågorna rör sig på en vattenyta när man kastar en liten sten).



Ju mer avancerad teknologin blir, desto hårdare krav ställs på antenndesignen. I det här sammanhanget föreslår denna avhandling en metod som kan användas för att förbättra antenndesignprocessen. Den här metoden kan användas för att få antenner som uppfyller kraven snabbare. Den kan också användas som hjälpverktyg för... (More)
Popular Abstract in Swedish

Antenner finns idag nästan överallt: i mobiltelefoner, bärbara datorer, surfplattor, kameror, skrivare, klockor och armbandsur, o.s.v. De används för att överföra information trådlöst mellan enheter med hjälp av elektromagnetiska vågor (som har egenskapen att utbreda sig, ungefär på samma sätt som vågorna rör sig på en vattenyta när man kastar en liten sten).



Ju mer avancerad teknologin blir, desto hårdare krav ställs på antenndesignen. I det här sammanhanget föreslår denna avhandling en metod som kan användas för att förbättra antenndesignprocessen. Den här metoden kan användas för att få antenner som uppfyller kraven snabbare. Den kan också användas som hjälpverktyg för antennkonstruktören som, med hjälp av datorn, designar antenner.



I antenndesign är det ibland viktigt att veta fysikaliska begränsningarna som gäller för det analyserade problemet. I den här avhandlingen används fysikaliska begränsningar härledda från optimala strömsfördelningar för antenndesign och -analys. (Less)
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... (More)
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. (Less)
Please use this url to cite or link to this publication:
author
supervisor
opponent
  • Professor Skrivervik, Anja, École polytechnique fédérale de Lausanne, Switzerland
organization
publishing date
type
Thesis
publication status
published
subject
pages
152 pages
defense location
Lecture hall E:1406, E-building, Ole Römers väg 3, Lund University Faculty of Engineering
defense date
2014-10-27 10:15
ISSN
1654-790X
language
English
LU publication?
yes
id
c2d592ad-a51d-4b34-a416-8905f4bc4cdc (old id 4690645)
date added to LUP
2014-10-03 12:39:23
date last changed
2016-09-19 08:45:00
@phdthesis{c2d592ad-a51d-4b34-a416-8905f4bc4cdc,
  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.<br/><br>
<br/><br>
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       = {Cismasu, Marius},
  issn         = {1654-790X},
  language     = {eng},
  pages        = {152},
  school       = {Lund University},
  title        = {Antenna Analysis and Design Using Stored Energies and Physical Limitations},
  year         = {2014},
}