This book bridges the gap between the conventional technology based on microstrip transmission line and futuristic technology based on Spoof Surface Plasmon Polariton-based transmission line. This book covers in detail, the study of different components such as filters, power dividers  and antennas, etc., using Spoof Surface Plasmon Polariton. This book also focusses on the study of SSPP technology for biomedical applications. Textile and Flexible antennas are gaining popularity these days because of their applications in defence and daily use gadgets. These important aspects are also studied in this book using SSPP technology.