An overview of coupled line fundamentals, this text explains their applications in designing microwave and millimetre-wave components used in today's personal communication, audio/visual, microwave, radar, satellite communications, and other systems. The text provides readers with an understanding of stripline, microstrip, monolithic and coplanar technologies. Emphasizing design, analysis and modern fabrication techniques and practices, it provides knowledge and guidance in helping them develop compact and low-cost design solutions and components, such as loose and tight couplers, filters, hybrids, transformers and baluns.