Calculations of Transverse Magnetic (TM) Wave Propagation between Strips in Different Shapes by using Finite Difference Time Domain (FDTD) Technique

Abstract

In this paper, the finite difference time domain (FDTD) technique was used in order to solve the time dependent Maxwell’s curl equations in two-dimensional. The numerical simulations based on 2D-FDTD equations in transverse magnetic (TMz) wave. We included many examples in this paper to demonstrate the propagation of (TMz) wave between the strips in different shapes. Furthermore, the domain truncated by applied the second order approximate absorption condition to simulate unbounded problem to limit the region of a computational domain and minimize reflections that generated by four boundaries in 2D-FDTD. Therefore, the electric and magnetic field components of the TMz waves propagated in 2D between the perfect electric conductors (PECs) and also distributions of the TMz waves can be controlled when propagating the waves between the PECs. The results of simulations indicated that the waves propagated and concentrated between PECs in each branch design and the distributions can be changed. It means that the distributions of the fields can be produced in different patterns compared to the original excitation and also the wave propagation direction can be controlled between the strips. We obtained the same distributions when the waves propagated in the symmetrical structures. The results of simulations illustrated that the signals appeared identical when comparing the distributions of propagations in T-junction in the upper and lower parts. The results of the calculations showed that the phase can be changed between the strips..