This work focuses on designing multiband-printed single/Multiple Input Multiple Output (MIMO) CP antennas for WLAN/V2X and NR Sub-6GHz 5G applications. It also delves into the design and implementation of a Four-Port MIMO antenna for wireless applications, addressing theoretical foundations and challenges. Additionally, the book explores critical aspects of software-defined radios (SDR), including modulation, signal processing, radio systems, TX/RX blocks, SDR-enabled phased arrays, and beam hopping techniques, with relevance to 5G, 6G, and IoT applications. Features: Explores advancements in planar monopole antennas, including bandwidth enhancement techniques Analyzes innovative antenna design structures, like miniaturized and conformal monopole antennas; and discusses modeling and implementation Spotlights WLAN and Wi-Fi 6/6E antenna design for next-gen laptops with practical insights Addresses the use of triple-band antenna arrays for MIMO applications in laptops Focuses on planar antenna advancements for diverse wireless bands and applications Explores multiband-printed single/MIMO CP antennas for WLAN/V2X and NR Sub-6GHz 5G Covers the design and implementation of a Four-Port MIMO antenna for wireless applications, including theoretical foundations and challenges Explores SDR, modulation, signal processing, radio systems, TX/RX blocks, SDR-enabled phased arrays, and beam hopping techniques for 5G, 6G, and IoT applications This book is aimed at graduate students and researchers in electrical and electronic engineering, antennas, and wireless communication systems.