Optimization of Time Modulated Arrays Through Switching Frequency

Abstract

The major disadvantage of TMAs is the sideband radiations (SR) which occur at different frequencies in addition to the main frequency caused by periodic switches. These radiations bring about some critical problems which are needed to be handled such as efficiency and powerloss. In order to solve these problems, different optimization techniques have been applied recently. However, the frequency set was not used as an optimization parameter in these studies and the effect of frequency on these quantities is of interest. In this work, the switching frequency is proposed as a new parameter to optimize the radiation characteristic of nonuniform time modulated arrays (NTMA). It is shown via comparative examples that the switching frequency can be used as another parameter to achieve the desired radiation criteria.