  In this work, we propose simple and efficient tridiagonal computed sparse
preconditioners for improving the condition number for large compressed
Electric Field Integral Equation (EFIE) Method of Moment (MoM) matrix. The
preconditioner computation is based on the triangle and block triangle
interaction and filled tridiagonally. The computed preconditioner is highly
sparse and retains the O(N) complexity of computation and preconditioner matrix
solution time. Numerical results show the efficiency and accuracy of the
proposed preconditioner.
