Imaginary part of antenna's admittance from its real part using Bode's integrals

The imaginary part of an antenna input admittance is calculated from its real part using Bode's integrals. Since the real part is typically a smoother function of the frequency than the imaginary part, the procedure presented here requires computation at a smaller number of frequency points, th...

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Bibliographic Details
Published in:IEEE transactions on antennas and propagation 1995-02, Vol.43 (2), p.220-223
Main Authors: Amari, S., Gimersky, M., Bornemann, J.
Format: Article
Language:English
Subjects:
Admittance
Antenna accessories
Antennas
Applied sciences
Exact sciences and technology
Noise robustness
Nuclear physics
Quantum mechanics
Radiocommunications
Resonant frequency
Robust stability
Solid state circuits
Telecommunications
Telecommunications and information theory
Time sharing computer systems
Wire
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Summary:The imaginary part of an antenna input admittance is calculated from its real part using Bode's integrals. Since the real part is typically a smoother function of the frequency than the imaginary part, the procedure presented here requires computation at a smaller number of frequency points, thus saves time, and is ideal for systems whose input conductance exhibits sharp peaks. A numerical procedure to evaluate the singular Bode's integral is also presented. Numerical examples using a wire antenna are used to illustrate the advantages of this approach compared to calculations involving a densely scanned frequency range. The noise stability and robustness of the algorithm are demonstrated through the successful prediction of the susceptance and the resonant frequencies of the antenna in the presence of random noise in the conductance.< >
ISSN:0018-926X
1558-2221
DOI:10.1109/8.366387