Extension of the Quasi-Static Approximation Technique to a Long Dipole Antenna for Improvement of the Accuracy of FDTD Calculation

Pornanong PONGPAIBOOL  Toru UNO  Takuji ARIMA  

IEICE TRANSACTIONS on Communications   Vol.E87-B   No.11   pp.3402-3405
Publication Date: 2004/11/01
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Antennas and Propagation
FDTD method,  dipole antenna,  quasi-static approximation,  subcell method,  

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A high accuracy numerical technique based on the Finite Difference Time Domain (FDTD) method for a long dipole antenna analysis is presented. An improvement of the accuracy can be achieved without reducing the cell size by incorporating a quasi-static field behavior into the FDTD update equations. A closed form of the quasi-static field is obtained from a low frequency limit of a sinusoidal current distribution. The validity of the proposed algorithm is confirmed even when the length of dipole antenna is longer than half wavelength by comparing the results with the Method of Moment.