3D Rapid-Prototyped 21-31-GHz Hollow SIWs for Low-Cost 5G IoT and Robotic Applications. - Giorgos Savvides; Nattapong Duangrit; Nonchanutt Chudpooti; Prayoot Akkaraekthalin; B. Ulrik Imberg; Ian D. Robertson; Nutapong Somjit (IEEE Access, 2021)