This book presents scientific and technological innovations and advancements already developed or under development in academia, industry, and research communities. It includes fundamental ideas and advancement in terahertz technology covering high intensity terahertz wave generation, THz detection, different modes of THz wave generation, THz modulation system, and terahertz propagation channel modeling. It highlights methodologies for the design of terahertz components and system technologies including emerging applications. The chapter contents are based on theoretical, methodological, well-established, and validated empirical work dealing with different topics in the terahertz domain. The book covers a very broad audience ranging from basic sciences to experts and learners in engineering and technology. It would be a good reference for advanced ideas and concepts in THz technology which will best suit microwave, biomedical, and electrical and communication engineers workingtowards next-generation technology.

Dr. Mohammed El Ghzaouireceived his Ph.D. in Transmission and Data Processing, at Sidi Mohammed ben Abdellah University, Morocco, in 2012. He is Professor at faculty of sciences Dhar El Mahraz, Sidi Mohamed Ben Abdellah University, Morocco. His current research interests include multiple input multiple output (MIMO), orthogonal frequency division multiplexing (OFDM) modulation, radio frequency identification, antennas, power line communication (PLC), spacetime coding, wireless communication, THz communication system, THz sources design, THz pulse shaping; pulse modulation; multiband onoff keying; THz channel modeling.

Dr. Sudipta Das is currently working as Associate Professor in the Department of Electronics and Communication Engineering at IMPS College of Engineering& Technology, West Bengal, India. He received his Ph.D.  from the University of Kalyani, India, in the year 2017. His research interests are microstrip antennas for microwave, mm-waveand THz communication systems, flexible antenna design, filter design, FSS, RFID, microwave components, and THz systems.

Dr. T. R. Lenka is currently Assistant Professor in the Department of Electronics and Communication Engineering, National Institute of Technology Silchar, Assam. He received Ph.D.  in Microelectronics Engineering from Sambalpur University, Odisha, India, in 2012. His research interests include nanoelectronics: III-Nitride and Ga2O3-based heterojunction devices for RF/microwave and power electronics and nanowire LED, solar photovoltaics, MEMS-based piezoelectric energy harvesting, and nanotechnology.

Dr. Arindam Biswas received his M.Tech. in Radio Physics and Electronics from the University of Calcutta, India, in 2010, and Ph.D. from NIT Durgapur, in 2013. He was Postdoctoral Researcher at Pusan National University, South Korea, under the prestigious BK21PLUS Fellowship. He was Visiting Professor at Research Institute of Electronics, Shizuoka University, Japan. Currently, Dr. Biswas is working as Assistant Professor in the School of Mines and Metallurgy, Kazi Nazrul University, Asansol, West Bengal, India. His research interests are in the area of carrier transport in low-dimensional systems and electronic devices, nonlinear optical communications, and THz semiconductor sources.

Chapter 1 - Terahertz VCO design for high-speed wireless communication systems (Abdelhafid Es-saqy, Maryam ABATA, Mohammed Fattah, Said Mazer, Mahmoud MEHDI, Moulhime El Bekkali and Catherine ALGANI).- Chapter 2 - A Comprehensive Reviews on terahertz detectors (Mohammed EL GHZAOUI).- Chapter 3 - On the Effective Electron Mass in Quantum Confined THz Materials (R. Paul, M. Mitra, A. K. Pradhan, M. Maiti, S. Mondal, K. Bhattacharyya, S. K. Biswas and K. P. Ghatak).-Chapter 4 - Opportunities and Challenges in THz Communication (M.Bharathi, A.Amsaveni, R. Priyadharshini).- Chapter 5 - Coding and Modulation for Terahertz (Mohamed EL JBARI, Mohamed MOUSSAOUI, and Noha CHAHBOUN).- Chapter 6 - Terahertz band frequency tuning for a CMOS active filter (Imane Halkhams, Wafae El Hamdani, Said Mazer, Moulhime El Bekkali).- Chapter 7 - A 10-element series fed non-uniform high directional planar antenna array at 0.3 THz (Anveshkumar Nella, Manish Sharma, Vulugundam Anitha, Tathababu Addepalli).- Chapter 8 - Compact two ports MIMO Antenna Operating at Terahertz Band (Nour EL HoudaNasri, Mohammed EL GHZAOUI, Mohammed Fattah).- Chapter 9 - High-Gain of a Canine MIMO antenna for Terahertz Applications(Bilal Aghoutane , Hanan El Faylali , Sudipta Das).- Chapter 10 - Terahertz Band for Wireless Communication - A Review (Ram Krishan).- Chapter 11 - Nonconventional Heterostructure Tunnel FET for Sensitive Tera Hertz Detection (Ritam Dutta).- Chapter 12 - Study and design of the microstrip patch antenna operating at 120 GHz (Salah-Eddine DIDI, Imane HALKHAMS, FATTAH Mohammed, Younes BALBOUL, Said MAZER, Moulhime EL BEKKALI, Sudipta Das).- Chapter 13 - Development of Dissimilar Shaped 8-Patch MassiveMIMO antenna for various applications with Enhancement of Bandwidth and ECC(Shrenik S. Sarade, S.D. Ruikar).- Chapter 14 - Asset Allotment in Hybrid RF/VLCCommunication in the 400-700 THz Band (Shivanshu Shrivastava, Sajal Agarwal, and Bin Chen).- Chapter 15 - Mechanical Engineering Challengesin Machining of Terahertz waveguide Components (Rakesh Kumar Bhardwaj, V P Dutta, Naresh Bhatnagar).- Chapter 16 - Material Selection, Micromachining and Measurements of THz Waveguide Components (Rakesh Kumar Bhardwaj, V P Dutta, Naresh Bhatnagar).- Chapter 17 - A Comparative Analysis of Optical and Electrical Control of High Frequency Properties of Si IMPATT in W-band (Suranjana Banerjee).