These Baluns and Ununs are probably the most efficient high power impedance matching transformers available in the world. They transmit the energy from input to output by a transmission line mode instead of by flux linkages as in the case of conventional transformers. When properly designed, they can have extremely high efficiencies and very broad bandwidths. The theory of operation of these devices rests chiefly on that of chokes and transmission lines. A balun or unun is simply a choke that isolates the input from the output thus only allowing transmission currents to flow and a configuration of transmission lines.
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The long awaited revision of the classic book Transmission Line Transformers , by Jerry Sevick, is now in its fifth edition and has been updated and reorganised by Raymond Mack to provide communication engineers with a clear technical presentation of both the theory and practical applications of the transmission of radio communication. Sevick's Transmission Line Transformers: Theory and Practice, 5th Edition reviews the underlying principles that promote a better understanding of transmission line transformers.
Ideal for academics and practicing engineers, this edition is divided into two clear parts for easy reference. Part one is a review of the theory and new concepts, including a discussion on the magnetic properties that affect the core of a transmission line transformer. Part two essentially focuses on the 'practice' element of the book title.
This section has been updated to reflect the significant changes in component suppliers over the 30 years since the first edition of the book. Highlights of this title include the coverage of substantial background theory, recent work on fractional ratio transformers and high power Balun designs, and provides updated sources for transformer materials to reflect mergers, sales, and business failures over the past 20 years.
There is also expanded coverage of commercial sources of low impedance coaxial cable; expanded construction hints for purpose built rectangular parallel transmission lines; plus an updated test equipment chapter to reflect modern computer based experimenter grade test equipment sources.
Ray has leveraged his experience with ferrite materials for switching power to explain the performance characteristics of the ferrite materials used for RF power transmission line transformers. Raymond A. His career in medical devices covered clinical chemistry analyzers, heart pacemakers, electro-surgery, and infant warming therapy.
From he worked in digital television for eight years and is now working in the oil and gas industry at National Oilwell Varco. Ray has worked for QEX magazine for 12 years as a technical proofreader, editor, writes a column on software defined radio, and has authored Switching Power Supplies Demystified. Ray's interests include alternative energy using switching power design, microwave system design, software defined radio, and DSP. Jerry Sevick, W2FMI - renowned for his research and publications related to short vertical antennas and transmission line transformers - passed away in During his career, he undertook the characterization and design of transformers for low impedance applications, resulting in this book, originally published in Mack , Jerry Sevick.