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2011-01-21

A Quasi-Static Theory for Dielectric-Coated Thin-Wire Antenna Structures

Alex Ike Mowete,

Prof. Alex Ike Mowete

Department of Electrical and Electronics Engineering

University of Lagos

Nigeria

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Ade Ogunsola,

Dr. Ade Ogunsola

Rail Transit Division

Parsons Group International

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Leonardo Sandrolini

Dr. Leonardo Sandrolini

Electrical, Electronic, and Information Engineering “G. Marconi

University of Bologna

Italy

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Progress In Electromagnetics Research Letters, Vol. 20, 45-54, 2011

doi:10.2528/PIERL10121104

Abstract

Analytical investigations of the problem of dielectriccoated thin-wire antenna structures have invariably focused on the physics of developing appropriate models for the dielectric insulation on the thin-wire conductors that serve as antenna for the structure. These include the frequency domain moment-method-based approaches in which the dielectric insulation is replaced by equivalent volume polarization currents; and the time-domain analysis based on the `equivalent radius' concept. An earlier paper gave a physical interpretation to the frequency-domain solutions to suggest that the volume polarization currents derive from an equivalent static charge distribution, which excites an essentially radially-directed quasi-static field, confined to the region associated with the dielectric insulation. It is the main objective of this paper to investigate the veracity of the claims made in open literature as they concern the physics of the model for the dielectric insulation in terms of the electric field excited in the dielectric region. And to that end, simulation experiments were carried out, using a commercial Transmission Line Matrix (TLM) Method code, with which the characteristic features of the radial and axial components of the electric field within the dielectric region were investigated. The simulation results obtained from the experiments suggest that the field in question is not only of the quasi-static variety, but that it is also characterized by an axial component that meets the boundary condition of vanishingly small values on the surface of the conducting wire, to support the theory proposed.

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Alex Ike Mowete, Ade Ogunsola, and Leonardo Sandrolini, "A Quasi-Static Theory for Dielectric-Coated Thin-Wire Antenna Structures," Progress In Electromagnetics Research Letters, Vol. 20, 45-54, 2011.
doi:10.2528/PIERL10121104

References

1. Richmond, J. H. and E. H. Newman, "Dielectric coated wire antenna," Radio Science, Vol. 11, 13-20, 1976.
doi:10.1029/RS011i001p00013

2. Lee, , J. P. Y. and K. G. Balmain, "Wire antennas coated with magnetically and electrically lossy material," Radio Science, Vol. 14, No. 3, 437-445, May-Jun. 1979.
doi:10.1029/RS014i003p00437

3. Chatterjee, A., J. L. Volakis, and W. J. Kent, "Scattering by a perfectly conducting and a coated thin wire using a physical basis model," IEEE Transactions on Antenna and Propagation, Vol. 40, No. 7, 761-769, Jul. 1992.
doi:10.1109/8.155740

4. Li, , X., K. E. Drissi, and F. Paladian, "A Galerkin moment-method for the analysis of insulated wires above a lossy half-space," Annales des Telecommunications, Vol. 58, No. 7/8, 1157-1177, 2003.

5. Moore, J. and M. A. West, "Simplified analysis of coated wire antennas and scatterers," Proc. IEE Microw. Antennas Propag., Vol. 142, No. 1, 14-18, Feb. 1995.
doi:10.1049/ip-map:19951651

6. Mowete, A. I. and A. Ogunsola, "Plane wave scattering by a coated thin wire," PIERS Proceedings, 743-749, Xi'an, China, Mar. 22-26, 2010..

7. Bretones, A. R., A. Martin, R. Gomez, A. Salinas, and I. Sanchez, "Time domain analysis of dielectric coated wire antennas and scatterers," IEEE Transactions on Antenna and Propagation, Vol. 42, No. 6, 815-819, Jun. 1994.
doi:10.1109/8.301700

8. Popovic, , B. D. and, A. Nesic, and , "Generalisation of the concept of equivalent radius of thin cylindrical antenna," IEE Proc., Vol. 131, No. 3, 153-158, 1984.

9. Adekola, S. A., A. I. Mowete, and A. Ogunsola, "On the problem of dielectric coated thin wire antenna," PIERS Proceedings, 431-437, Moscow, Russia, Aug. 18-21, 2009.

10. CST --- Computer Simulation Technology "CST Microstripes 2010,", Wellesley Hills, MA, USA, 2010.

11. Lamensdorf, D., "An experimental investigation of dielectric-coated antennas," IEEE Transactions on Antennas and Propagation, Vol. 15, No. 6, 767-771, Nov. 1967.
doi:10.1109/TAP.1967.1139049

12. Christopoulos, C., The Transmission Line Modelling Method --- TLM, IEEE Press, New York, 1995.
doi:10.1109/9780470546659