Hallen Type Integral Equation for Cylindrical Antennas with Finite Gap Excitation

Di WU  Naoki INAGAKI  Nobuyoshi KIKUMA  

IEICE TRANSACTIONS on Communications   Vol.E82-B    No.12    pp.2145-2152
Publication Date: 1999/12/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Antennas and Propagation
integral equation,  cylindrical antenna,  finite gap excitation,  external and internal current,  moment method,  

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Hallen's integral equation for cylindrical antennas is modified to deal with finite gap excitation. Because it is based on more realistic modeling, the solution is more accurate, and the convergence is guaranteed. The new equation is written with a new excitation function dependent on the gap width. The moment method analysis is presented where the piecewise sinusoidal surface current functions are used in Galerkin's procedure. Total, external and internal current distributions can be determined. Numerical results for cylindrical antennas with wide variety of gap width and radius are shown, and are compared with the numerical results by the Pocklington type integral equation and those by measurement.