The 4th Int'l Conference on Microwave and Terahertz Technology (ICMTT 2019) will be held in Sanya, China during January 3-5, 2019. ICMTT 2019 is sponsored by Engineering Information Institute, Open Access Library, Scientific Research Publishing, and 1000thinktank. This Conference will cover issues on Microwave and Terahertz Technology. It dedicates to creating a stage for exchanging the latest research results and sharing the advanced research methods.