Stored energies for electric and magnetic currents with applications to Q for small antennas

Fundamental limitations restrict the bandwidth of electrically small antennas. A method to obtain such limitations is based on stored electric and magnetic energies. Vandenbosch recently proposed a set of integral expression for the stored energies. These expressions provide a method to determine op...

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Bibliographic Details
Published in2013 International Symposium on Electromagnetic Theory pp. 1050 - 1053
Main Authors Jonsson, B. L. G., Gustafsson, Mats
Format Conference Proceeding
LanguageEnglish
Published IEEE 01.05.2013
SeriesURSI International Symposium on Electromagnetic Theory
Subjects
Antennas
Bandwidth
Current density
Dipole antennas
Electric fields
Electrical Engineering, Electronic Engineering, Information Engineering
Electrically small antennas
Electromagnetics
Elektroteknik och elektronik
Energy storage
Engineering and Technology
Fundamental limitations
Magnetic currents
Magnetic energies
Magnetic moments
Magnetic sources
Optimal current
Radiated Field
Small spheres
Teknik
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Summary:Fundamental limitations restrict the bandwidth of electrically small antennas. A method to obtain such limitations is based on stored electric and magnetic energies. Vandenbosch recently proposed a set of integral expression for the stored energies. These expressions provide a method to determine optimal currents and physical bounds on antennas for maximal bandwidth and desired radiated fields. In the present paper, we generalize the expressions for the stored energies to include magnetic sources for small structures. We give an expression for the antenna Q for electrically small shapes. Examples for small spheres are tested and the results agree with the published results.
ISBN:9781467349390
1467349399