Complete Surface Current Surface Distribution in a Normal-Mode Helical Antenna using a Galerkin Solution with Sinusoidal Basis Functions
Publication date
2002Keyword
Normal-mode helical antennaNon-uniform and transverse current distributions
Galerkin's solution method
Helix geometries
Surface current surface distribution
Sinusoidal basis functions
Peer-Reviewed
YesOpen Access status
closedAccess
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An investigation of the surface current distribution in a normal-mode helical antenna (NMHA) is reported. This enables precise prediction of the performance of NMHAs, since traditional wire-antenna simulations ignore important details, such as non-uniform and transverse current distributions. A moment-method formulation is developed, using two-dimensional basis functions to represent the total non-uniform surface current distribution over the surface of the wire of the helix. Piecewise-sinusoidal basis functions are employed in two normal directions, with an exact kernel formulation and application of Galerkin's solution method. The numerical solution of the singular integrals associated with self-impedance terms was computed with a very low relative error. The surface current distribution was computed for different helix geometries. It was found that the axially-directed component of the current distribution around the surface of the wire was highly non-uniform and that there was also a significant circumferential current flow due to inter-turn capacitance, both effects that are overlooked by standard filamentary current representations.Version
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Abd-Alhameed R and Excell PS (2002) Complete Surface Current Surface Distribution in a Normal-Mode Helical Antenna using a Galerkin Solution with Sinusoidal Basis Functions. IEE Proceedings - Science, Measurement and Technology. 149(5): 272-276.Link to Version of Record
https://doi.org/10.1049/ip-smt:20020568Type
Articleae974a485f413a2113503eed53cd6c53
https://doi.org/10.1049/ip-smt:20020568