An improvement algorithm of Mur's first-order absorbing boundary condition

The paper presents an improvement algorithm of Mur's first-order absorbing boundary condition, which greatly improves the absorption of absorbing boundaries in solving subjects by the finite-difference time-domain method, especially for those with a point or line radiation source. For validity, the field distribution of an isotropic point source is studied by the improvement algorithm, Mur's first-order and Mur's second-order absorbing boundary conditions respectively. It proves that the improvement algorithm is more efficient than Mur's first-order absorbing boundary condition. At the same time, it is simpler than Mur's second-order absorbing condition and saves memory. The paper also shows some numerical results of the near-field distribution of hand-held transceivers improvement algorithm, and compares the numerical and experimental results.