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This Special Issue of IEEE Transactions on Microwave Theory and Techniques (TMTT) is comprised of the expanded papers from the 2021 IEEE Microwave Theory and Techniques Society (IEEE MTT-S) International Microwave Symposium (IMS2021), held in Atlanta, GA, USA, on June 2021. The IEEE MTT-S International Microwave Symposium is the world’s major event of microwave technologies annually organized by the IEEE MTT-S as the society’s premier flagship conference. The conference represents a unique opportunity to bring together researchers and practitioners with diverse technical backgrounds to share the most recent advances in MHz-to-THz technologies and systems. Due to the unprecedented pandemic situations, the IMS2021 was held in a hybrid format, comprised of in-person and virtual participation options. The in-person event was held on June 7–10, 2021, at the Georgia World Congress Center, Atlanta. A virtual event followed on June 20–25, 2021. [ABSTRACT FROM AUTHOR]