Multiple Source 2D wave propagation using FDTD method

FDTD(Finite Difference Time Domain) is the most easiest method of EM Solver.In this code i just demonstrate that how can we launch multiple sources in a single time,and how they can combine effect with in single time domain.
The Sources are taken as 20GHz Sine wave and number of signal are generated by its 8 port.This code is also very helpful for array analysis of micro-strip patch Antenna design and its FDTD simulation.