Slotted waveguide antenna design by segmented simulation and multi-objective genetic algorithm

A progressive-wave antenna automated design technique is presented in this work. By means of a simulation method based on spherical wave expansion and generalized scattering matrix, full-wave analysis of a slotted waveguide array can be efficiently performed. Since coupling effects are considered in the simulation, a final antenna design can be obtained without any further modification required on it. In order to achieve such design, a multi-objective optimization based on Nondominated Sorting Genetic Algorithm Version III (NSGA-III) state-of-the-art genetic algorithm is carried out. At the working frequency of 17 GHz, final design provides a 16.6 dBi gain, Side-Lobe Levels lower than −18.3 dB and a 0.6% power waste at the output port. A −15-dB matching bandwidth of an 8.8% is obtained. The results have been validated with commercial-software simulations.