R.K Mongia 
RF and Microwave Coupled-Line Circuits [PDF ebook] 

This extensively revised edition of the 1999 Artech House classic, RF and Microwave Coupled-Line Circuits, offers you a thoroughly up-to-date understanding of coupled line fundamentals, explaining their applications in designing microwave and millimeter-wave components used in today ’s communications, microwave, and radar systems. The Second Edition includes a wealth of new material, particularly relating to applications. You find brand new discussions on a novel simple design technique for multilayer coupled circuits, high pass filters using coupled lines, software packages used for filter design, design of elliptic response microstrip filters, and advanced filters using new materials and technologies. This unique book provides you with a thorough understanding of stripline, microstrip, monolithic, and coplanar technologies. Emphasizing design, analysis, and modern fabrication techniques and practices, it provides invaluable knowledge and guidance in helping you develop compact and low-cost design solutions and components such as loose and tight couplers, filters, hybrids, transformers, and baluns. Featuring more than 1100 equations, this comprehensive book serves as a consolidated resource of classic and cutting-edge information on coupled structures.