Finite Stacked Microstrip Arrays with Thick Substrates

Subject heading: microstrip antennas. III This report deals with a method for the analysis of phased arrays of rectangular slacked microstrip antennas. The method of moments is used in combination with the exact spec-tral domain Green's function in order to calculate the unknown currents on each array element. First arrays based on electrically thin dielectric substrates are investigated. Lat-eron this model is extended to the case of arrays on electrically thick substrates. In this case a proper model for the feeding coaxial cables has to be used including an attachment mode that ensures continuity of current at the probe/patch transitions. When analysing arrays it is extremely important that the asymptotic-form extraction technique is used. Without this analytical method it is almost impossible to analyse large arrays accurately with an acceptable computation time. More computation time can be saved if interactions in the method of moments matrices between basis functions that are located far away from each other are neglected. In this way these matrices become spars