FDTD Analysis of Transient Radiating and Reflecting Electromagnetic Fields of Finite Length Microstrip Lines with Terminal Cross-sections

For the electromagnetic analysis of microstrip lines with finite length and terminal cross-sections, analytical solutions for the electromagnetic reflection and radiation field characteristics are difficult to derive. Several approximate theoretical and numerical investigations are reported in the literature. We have so far studied the electromagnetic fields of guided waves at junctions and corners, as applied to antenna devices, using FDTD numerical analysis applied to Laplace equation and Maxwell's equations. In this research, we investigated the transient behavior of radiation and reflection characteristics of electromagnetic field components microstrip lines of finite length. We have studied, axial and transverse components variation of electrical fields in the transmission line and free space near the terminal points are studied in detail. Also investigated are the frequency characteristics of radiation from mictrostrip lines with terminals of different structures.