The main objective of this book is to present efficient wearable systems, compact sensors and antennas for communication and healthcare systems. The major application of wearable Body Area Networks (BANs), and of Wireless Body Area Networks (WBANs), is to help physicians to monitor the health of their patients. This book may serve students and design engineers as a reference book. It presents new designs in the area of wearable systems and antennas, metamaterial antennas, fractal antennas and active receiving and transmitting antennas. The new edition presents new wearable active and passive microstrip circular antennas, green electronic technologies, microwave measurements, ethic dilemmas and considerations in development of wearable devices.