Study of model order reduction techniques for modeling large finite antenna array

Abstract

Numerical analysis of wide band large antenna array plays a crucial role in the prediction of design performance prior to construction. Since these arrays mostly are electrically large and include complex geometries, accurate simulation is a great challenge. However, recent developments of domain decomposition method (DDM) [1][2] provides us an efficient way to obtain field solution at each frequency point. However, for many real-life phased array applications, the spectral responses over a wide frequency band are usually needed. For frequency domain CEM approaches, the model order reduction (MORe) techniques are often employed for fast frequency sweep. In this paper, we study a few MORe techniques and apply them for large finite antenna array. Through our numerical studies and plots of pole distributions, we found that the number of expansion points increases significantly with the size of array. By using the current existing MORe method, the costs for modeling electrically large electromagnetic problems are still prohibitive.