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State-space models and stored electromagnetic energy for antennas in dispersive and heterogeneous media

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Author

Summary, in English

Accurate and efficient evaluation of the stored energy is essential for Q-factors, physical bounds, and antenna current optimization. Here, it is shown that the stored energy can be estimated from quadratic forms based on a state-space representation derived from the electric and magnetic field integral equations. The derived expressions are valid for small antennas embedded in temporally dispersive and inhomogeneous media. The quadratic forms also provide simple single frequency formulas for the corresponding Q-factors. Numerical examples comparing the different Q-factors are presented for dipole and meander line antennas in conductive, Debye, and Lorentz media for homogeneous and inhomogeneous media. The computed Q-factors are also verified with the Q-factor obtained from the stored energy in Brune synthesized circuit models.

Publishing year

2017-02-09

Language

English

Publication/Series

Technical Report LUTEDX/(TEAT-7245)/1-21/(2017)

Issue

7245

Document type

Report

Publisher

Elektro- och informationsteknik

Topic

  • Other Electrical Engineering, Electronic Engineering, Information Engineering

Status

Published

Project

  • EIT_CACO-EMD Complex analysis and convex optimization for EM design

Research group

  • Electromagnetic Theory