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Restrictions in the far-field of antennas enclosed in bodies of revolution

Bäck, Clara LU (2016) EITM01 20152
Department of Electrical and Information Technology
Abstract
Antennas can be found everywhere in our everyday life. One of the applications for them are space satellites, which can be used for communication, positioning and weather supervision. A satellite carries several components on its body, such as solar panels and cameras, therefore there is a volume restriction for the antenna to fit. This requirement gives rise to restrictions in the far-field for the radiation pattern.

The objective was to implement a calculation-tool by MATLAB, where theoretical surface currents on a structure could be calculated for a required far-field for a specified antenna outline. A genetic algorithm optimization generated feasible solutions and the MATLAB-tool evaluated the cost for it by comparing a far-field... (More)
Antennas can be found everywhere in our everyday life. One of the applications for them are space satellites, which can be used for communication, positioning and weather supervision. A satellite carries several components on its body, such as solar panels and cameras, therefore there is a volume restriction for the antenna to fit. This requirement gives rise to restrictions in the far-field for the radiation pattern.

The objective was to implement a calculation-tool by MATLAB, where theoretical surface currents on a structure could be calculated for a required far-field for a specified antenna outline. A genetic algorithm optimization generated feasible solutions and the MATLAB-tool evaluated the cost for it by comparing a far-field mask with the far-field given by the feasible solution.

The analysis was performed for two structures, a cylinder and a circular disc. Solutions were found when the dimensions of the structures were large, but the cost increased when the structures diminished. The solutions that were found were theoretical and not feasible in practice. A suggestion for excluding unphysical solutions is presented with a contribution to the cost function. (Less)
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author
Bäck, Clara LU
supervisor
organization
course
EITM01 20152
year
type
H2 - Master's Degree (Two Years)
subject
keywords
Antenna pattern synthesis, body of revolution, far-field restrictions, genetic algorithm
report number
LU/LTH-EIT 2016-495
language
English
id
8871303
date added to LUP
2016-04-21 13:15:58
date last changed
2016-04-21 13:15:58
@misc{8871303,
  abstract     = {Antennas can be found everywhere in our everyday life. One of the applications for them are space satellites, which can be used for communication, positioning and weather supervision. A satellite carries several components on its body, such as solar panels and cameras, therefore there is a volume restriction for the antenna to fit. This requirement gives rise to restrictions in the far-field for the radiation pattern.

The objective was to implement a calculation-tool by MATLAB, where theoretical surface currents on a structure could be calculated for a required far-field for a specified antenna outline. A genetic algorithm optimization generated feasible solutions and the MATLAB-tool evaluated the cost for it by comparing a far-field mask with the far-field given by the feasible solution. 

The analysis was performed for two structures, a cylinder and a circular disc. Solutions were found when the dimensions of the structures were large, but the cost increased when the structures diminished. The solutions that were found were theoretical and not feasible in practice. A suggestion for excluding unphysical solutions is presented with a contribution to the cost function.},
  author       = {Bäck, Clara},
  keyword      = {Antenna pattern synthesis,body of revolution,far-field restrictions,genetic algorithm},
  language     = {eng},
  note         = {Student Paper},
  title        = {Restrictions in the far-field of antennas enclosed in bodies of revolution},
  year         = {2016},
}