Machine　learning　for　microwave　computer-aided　design　(CAD)　started　in　the　1990s　in　the　form　of　Artificial　Neural　Networks　(ANN)　for　RF/Microwave　design.　Presently,　it　has　become　one　of　the　most　active　topic　areas　in　microwave　CAD.　This　presentation　starts　with　a　brief　description　of　historical　developments,　and　highlights　some　of　the　state-of-the-art　research,　and　emerging　directions　in　the　area.　©　2022　EuMA.