In recent years, there has been constant growth in using THz frequencies or mm, sub-mm wavelengths for various applications such as: Astronomy, Atmospheric studies, security, bio-medical imaging. All these applications are now seen more feasible due to rapid enhancements of semiconductor processing technologies. The state of the art MMIC processing techniques offering increased cut-off frequencies (> 500 GHz) of HEMT/HBT transistors, open up new opportunities for integrating systems on chip along with an antenna for security imaging systems. The talk will first describe current trends in THz security imaging systems along with overview of key THz technologies such as Schottky Diodes, HEBs, HEMT and DHBTs. Further the talk will focus on using MMIC technology for developing THz antenna integrated receivers for Imaging systems. The practical implementation of a 340GHz antenna integrated Mixer Receiver using DHBT technology will be presented.
Dr.Yogesh B Karandikar did his B.Tech in Electronics & Telecommunications from Mumbai university in 2004, and his MSc from Chalmers University, Sweden in 2006 in the area of in Advanced Techniques in Radio Astronomy & Space Science. He completed his Ph.D also from Chalmers University in May 2012. His thesis title was “Integration of Planar Antennas with MMIC Active Frontends for THz Imaging Applications”. Currently he is doing his post-doctoral research in the from Microwave Electronics Laboratory, Dept. of Microtechnology and Nanoscience, Chalmers University of Technology, Sweden. His current areas of research are: Development of antenna integrated MMIC for THz imaging radar applications; Development of MMIC processing for HEMT device; Design and testing of Planar antennas above 100 GHz; Development of mixers in the band of 100-350 GHz and their integration with planar antennas using MMIC technology.