Help for solving FDTD MATLAB code for antipodal patch

Hi every one, I have written some FDTD code in matlab for simple antipodal patch antenna with Mur fisrt order ABC. it is simple form of bowtie that I try to simulate it, but I have some problem, gradually Ez and totall voltage are increased-more than 1. It was attached to this message, If you can solve it, I really appreciate it.

nobody can help me! everyone that is expert in ABC please help me.

please have u got the FDTD matlabe code for triangular ptach antenna