The XXIIth International Seminar/Workshop on Direct and Inverse Problems of Electromagnetic and Acoustic Wave Theory (DIPED-2017) was organized by the IEEE MTT/ED/AP/CPMT/SSC West Ukraine and MTT/ED/AP Georgian Chapters. This year, seminar was held at the Dnipropetrovsk National University, Dnipro, Ukraine, on September 25-28. The workshop provides an opportunity to exchange scientific results and current research progress in the area of electromagnetics, electrodynamics, antennas and acoustics theory and applications. Technical sponsors were the IEEE Electron Devices Society, APS IEEE Antennas and Propagation Society and IEEE Microwave Theory & Techniques Society.