Equivalent Circuit With Frequency-Independent Lumped Elements for Coated Wire Antennas

A 7-element lumped-parameter equivalent circuit is derived for wire antennas coated with a thin dielectric and/or magnetic material. The derivation is based on a method for transforming any coating to an equivalent magnetic coating on a wire with a different radius. The derived circuit is composed o...

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Bibliographic Details
Published in:IEEE transactions on antennas and propagation 2012-11, Vol.60 (11), p.5419-5423
Main Authors: Liao, Yi, Hubing, Todd H., Su, Donglin
Format: Article
Language:English
Subjects:
Antennas
Applied sciences
Coatings
Dielectric coating
Dielectrics
Dipole antennas
equivalent circuit
Equivalent circuits
Exact sciences and technology
magnetic coating
Radiocommunications
Telecommunications
Telecommunications and information theory
wire antennas
Wires
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Description
Summary:A 7-element lumped-parameter equivalent circuit is derived for wire antennas coated with a thin dielectric and/or magnetic material. The derivation is based on a method for transforming any coating to an equivalent magnetic coating on a wire with a different radius. The derived circuit is composed of a five-element sub-circuit for bare wire antennas plus a two-element parallel circuit for modeling magnetic coatings. Compared to full-wave simulations and measurements, this equivalent circuit provides reasonably accurate results over a broad frequency range that includes the first resonance. It can be used to estimate the input impedance of a coated antenna without requiring an EM solver. It can also be used to model coated antennas in circuit simulations.
ISSN:0018-926X
1558-2221
DOI:10.1109/TAP.2012.2207697