Improvement of the accuracy in FDTD analysis of dipole and square loop antennas by utilizing a quasi-static approximation

This work proposes a technique for improving the accuracy of the finite difference time domain (FDTD) method for a dipole and a square loop antenna analysis. The improvement is achieved by incorporating a quasi-static field behavior into the FDTD update equations. In the case of a dipole antenna, a closed form of the quasi-static field is obtained from a low frequency limit of a sinusoidal current distribution. The effectiveness of the proposed algorithm is confirmed for both dipole and square loop antennas by comparing with the method of moment (MoM).