Dr. Prakash Pareek earned his Ph.D. degree from the Indian Institute of Technology Dhanbad, India, in 2017. He is currently working as an Associate Professor in the Department of Electronics and Communication Engineering at Vishnu Institute of Technology, Bhimavaram, Andhra Pradesh, India. His research interests include optical communications, Group IV optoelectronic devices, plasmonics and integrated optics, and THz photonics.Dr. Naveen Mishra is a Senior Assistant Professor in the School of Electronics Engineering at Vellore Institute of Technology, VIT University, Vellore. He joined the VIT University in May 2019. He joined the Department of Electronics Engineering, Indian Institute of Technology (Indian School of Mines) Dhanbad, in January 2014, as a Junior Research Fellow, where he worked as a Senior Research Fellow from January 2016 to May 2019. His current research interests include metamaterial structures and their applications.Dr. Indrasen Singh is an Assistant Professor in the School of Electronics Engineering at Vellore Institute of Technology (VIT), Vellore, Tamil Nadu, India. He earned his B.Tech. and M.Tech. degrees in Electronics and Communication Engineering from Uttar Pradesh Technical University, Lucknow, India, in 2006 and 2010, respectively. He earned his Ph.D. degree in Electronics and Communication Engineering from the National Institute of Technology Kurukshetra, Haryana, India, in 2019. His research interests include cooperative communication, stochastic geometry, modeling of wireless networks, heterogeneous networks, millimeter‑wave communications, device‑to‑device communication, and 5G/6G communication.Dr. Abhinav Gautam is a Marie Curie Postdoctoral Fellow in the Photonic Systems Group at Tyndall National Institute, Cork, Ireland. He earned his Ph.D. degree. in Electronics and Communication Engineering from the Indian Institute of Technology (ISM) in 2022, where he also earned his master’s degree in 2016. He received his bachelor’s degree in Electronics and Communication Engineering from Rajiv Gandhi Technical University in 2013. His research interests encompass fiber optic sensing, optical communication, photonic systems, and microwave photonics.Dr. Jitendra K. Mishra earned his Ph.D. degree in Electronics and Communication Engineering from the Indian Institute of Technology (ISM) Dhanbad, India, in 2016. Currently, he is with the Department of Electronics and Communication Engineering, Indian Institute of Information Technology Ranchi, Jharkhand, India. His research interests include optical fiber communication, optical wireless communication, optical quantum communication, and the application of machine learning in information and communication technology.

• Chapter 1 Advancements in Terahertz Antenna for 5G and Beyond Chapter 2 Beamforming and MIMO for Terahertz Technology in Microwave and Photonic Systems Chapter 3 Radar Cross Section Reduction Using Metasurfaces: Methods, Metrics, and Future Scope Chapter 4 AI/ML-Enhanced Inter-Satellite Optical Wireless and Fiber Communication for Intelligent 5G/6G Networks Chapter 5 Millimeter-Wave communication and Terahertz Spectrum for 6G Wireless Network Chapter 6 Terahertz Communication and Its Application in Microwave Chapter 7 A Review on state-of-the-art Implementations in Optically Transparent Antennas Chapter 8 Graphene Based Antennas and Absorbers for Terahertz Applications Chapter 9 Reconfigurable THz MIMO Antenna Based on Graphene: An Overview Chapter 10 A Compact Graphene Antenna for Advanced 6G Communication and Sensing Technologies Chapter 11 Frequency-Tunable Graphene-based THz Devices Chapter 12 Synergizing Terahertz Radiation and Surface Plasmons: Innovations in Filters and Sensing Applications Chapter 13 Exploring NOMA in Satellite and mmWave Photonic Communication for Future Networks Chapter 14 Modulation and Diversity in Co-operative VLC: Trade-offs and Optimizations for System Design

Dr. Prakash Pareek earned his Ph.D. degree from the Indian Institute of Technology Dhanbad, India, in 2017. He is currently working as an Associate Professor in the Department of Electronics and Communication Engineering at Vishnu Institute of Technology, Bhimavaram, Andhra Pradesh, India. His research interests include optical communications, Group IV optoelectronic devices, plasmonics and integrated optics, and THz photonics.Dr. Naveen Mishra is a Senior Assistant Professor in the School of Electronics Engineering at Vellore Institute of Technology, VIT University, Vellore. He joined the VIT University in May 2019. He joined the Department of Electronics Engineering, Indian Institute of Technology (Indian School of Mines) Dhanbad, in January 2014, as a Junior Research Fellow, where he worked as a Senior Research Fellow from January 2016 to May 2019. His current research interests include metamaterial structures and their applications.Dr. Indrasen Singh is an Assistant Professor in the School of Electronics Engineering at Vellore Institute of Technology (VIT), Vellore, Tamil Nadu, India. He earned his B.Tech. and M.Tech. degrees in Electronics and Communication Engineering from Uttar Pradesh Technical University, Lucknow, India, in 2006 and 2010, respectively. He earned his Ph.D. degree in Electronics and Communication Engineering from the National Institute of Technology Kurukshetra, Haryana, India, in 2019. His research interests include cooperative communication, stochastic geometry, modeling of wireless networks, heterogeneous networks, millimeter‑wave communications, device‑to‑device communication, and 5G/6G communication.Dr. Abhinav Gautam is a Marie Curie Postdoctoral Fellow in the Photonic Systems Group at Tyndall National Institute, Cork, Ireland. He earned his Ph.D. degree. in Electronics and Communication Engineering from the Indian Institute of Technology (ISM) in 2022, where he also earned his master’s degree in 2016. He received his bachelor’s degree in Electronics and Communication Engineering from Rajiv Gandhi Technical University in 2013. His research interests encompass fiber optic sensing, optical communication, photonic systems, and microwave photonics.Dr. Jitendra K. Mishra earned his Ph.D. degree in Electronics and Communication Engineering from the Indian Institute of Technology (ISM) Dhanbad, India, in 2016. Currently, he is with the Department of Electronics and Communication Engineering, Indian Institute of Information Technology Ranchi, Jharkhand, India. His research interests include optical fiber communication, optical wireless communication, optical quantum communication, and the application of machine learning in information and communication technology.

• Chapter 1 Advancements in Terahertz Antenna for 5G and Beyond Chapter 2 Beamforming and MIMO for Terahertz Technology in Microwave and Photonic Systems Chapter 3 Radar Cross Section Reduction Using Metasurfaces: Methods, Metrics, and Future Scope Chapter 4 AI/ML-Enhanced Inter-Satellite Optical Wireless and Fiber Communication for Intelligent 5G/6G Networks Chapter 5 Millimeter-Wave communication and Terahertz Spectrum for 6G Wireless Network Chapter 6 Terahertz Communication and Its Application in Microwave Chapter 7 A Review on state-of-the-art Implementations in Optically Transparent Antennas Chapter 8 Graphene Based Antennas and Absorbers for Terahertz Applications Chapter 9 Reconfigurable THz MIMO Antenna Based on Graphene: An Overview Chapter 10 A Compact Graphene Antenna for Advanced 6G Communication and Sensing Technologies Chapter 11 Frequency-Tunable Graphene-based THz Devices Chapter 12 Synergizing Terahertz Radiation and Surface Plasmons: Innovations in Filters and Sensing Applications Chapter 13 Exploring NOMA in Satellite and mmWave Photonic Communication for Future Networks Chapter 14 Modulation and Diversity in Co-operative VLC: Trade-offs and Optimizations for System Design

Dr. Prakash Pareek earned his Ph.D. degree from the Indian Institute of Technology Dhanbad, India, in 2017. He is currently working as an Associate Professor in the Department of Electronics and Communication Engineering at Vishnu Institute of Technology, Bhimavaram, Andhra Pradesh, India. His research interests include optical communications, Group IV optoelectronic devices, plasmonics and integrated optics, and THz photonics.Dr. Naveen Mishra is a Senior Assistant Professor in the School of Electronics Engineering at Vellore Institute of Technology, VIT University, Vellore. He joined the VIT University in May 2019. He joined the Department of Electronics Engineering, Indian Institute of Technology (Indian School of Mines) Dhanbad, in January 2014, as a Junior Research Fellow, where he worked as a Senior Research Fellow from January 2016 to May 2019. His current research interests include metamaterial structures and their applications.Dr. Indrasen Singh is an Assistant Professor in the School of Electronics Engineering at Vellore Institute of Technology (VIT), Vellore, Tamil Nadu, India. He earned his B.Tech. and M.Tech. degrees in Electronics and Communication Engineering from Uttar Pradesh Technical University, Lucknow, India, in 2006 and 2010, respectively. He earned his Ph.D. degree in Electronics and Communication Engineering from the National Institute of Technology Kurukshetra, Haryana, India, in 2019. His research interests include cooperative communication, stochastic geometry, modeling of wireless networks, heterogeneous networks, millimeter‑wave communications, device‑to‑device communication, and 5G/6G communication.Dr. Abhinav Gautam is a Marie Curie Postdoctoral Fellow in the Photonic Systems Group at Tyndall National Institute, Cork, Ireland. He earned his Ph.D. degree. in Electronics and Communication Engineering from the Indian Institute of Technology (ISM) in 2022, where he also earned his master’s degree in 2016. He received his bachelor’s degree in Electronics and Communication Engineering from Rajiv Gandhi Technical University in 2013. His research interests encompass fiber optic sensing, optical communication, photonic systems, and microwave photonics.Dr. Jitendra K. Mishra earned his Ph.D. degree in Electronics and Communication Engineering from the Indian Institute of Technology (ISM) Dhanbad, India, in 2016. Currently, he is with the Department of Electronics and Communication Engineering, Indian Institute of Information Technology Ranchi, Jharkhand, India. His research interests include optical fiber communication, optical wireless communication, optical quantum communication, and the application of machine learning in information and communication technology.

• Chapter 1 Advancements in Terahertz Antenna for 5G and Beyond Chapter 2 Beamforming and MIMO for Terahertz Technology in Microwave and Photonic Systems Chapter 3 Radar Cross Section Reduction Using Metasurfaces: Methods, Metrics, and Future Scope Chapter 4 AI/ML-Enhanced Inter-Satellite Optical Wireless and Fiber Communication for Intelligent 5G/6G Networks Chapter 5 Millimeter-Wave communication and Terahertz Spectrum for 6G Wireless Network Chapter 6 Terahertz Communication and Its Application in Microwave Chapter 7 A Review on state-of-the-art Implementations in Optically Transparent Antennas Chapter 8 Graphene Based Antennas and Absorbers for Terahertz Applications Chapter 9 Reconfigurable THz MIMO Antenna Based on Graphene: An Overview Chapter 10 A Compact Graphene Antenna for Advanced 6G Communication and Sensing Technologies Chapter 11 Frequency-Tunable Graphene-based THz Devices Chapter 12 Synergizing Terahertz Radiation and Surface Plasmons: Innovations in Filters and Sensing Applications Chapter 13 Exploring NOMA in Satellite and mmWave Photonic Communication for Future Networks Chapter 14 Modulation and Diversity in Co-operative VLC: Trade-offs and Optimizations for System Design