Using equivalent dielectric constant to simplify the analysis of patch microstrip antenna with multi-layer substrates

This paper presents a method to simplify the calculations of cavity model analysis on a multi-layer microstrip antenna. The main feature of this method is the simplification of a multi-layer antenna structure into a single homogeneous layer antenna. This in effect completely eliminate the problem of mode matching between layers and thus reduces the amount of calculation and computing time. Theoretical results obtained using this method were compared with the experimental results and were round to give an error of less than 4%.