Slow-Wave Transmission Line Transformers/Baluns
thesisposted on 2014-04-15, 00:00 authored by Vamsee K. Chekka
The design and analysis of a miniaturized transmission line transformer/balun for RF applications is proposed. A novel right-handed slow-wave line using three-dimensional periodic substrate metallization is proposed, where each unit cell is made up of a multilayer loop as a series inductor and parallel strips as a shunt capacitor. DC isolated single-end primary and differential secondary are constructed using three quarter-wave slow-wave lines. A design example is given for a 1:3 voltage ratio at 1.9GHz with slow-wave factors (SWF) between 8~9 for the quarter-wave lines on a three-layer FR4 substrate. The planar dimensions of the electrically small balun are 10mm by 6mm. Details of the designs with simulated and measured data are discussed.
AdvisorYang, H. Y. David
DepartmentElectrical and Computer Engineering
Degree GrantorUniversity of Illinois at Chicago