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http://dx.doi.org/10.5515/KJKIEES.2007.18.7.698

10-Bit Full-Coverage Impedance Tuner Using a Directional Coupler and PIN Diodes  

Lee, Dong-Kyu (School of Electrical Engineering and Computer Science, Seoul National University)
Lee, Sang-Hyo (School of Electrical Engineering and Computer Science, Seoul National University)
Kwon, Young-Woo (School of Electrical Engineering and Computer Science, Seoul National University)
Publication Information
The Journal of Korean Institute of Electromagnetic Engineering and Science / v.18, no.7, 2007 , pp. 698-703 More about this Journal
Abstract
In this paper, a novel impedance tuner using a directional coupler is proposed. The design topology is analyzed by signal flow graph(SFG) and shows advantages compared with conventional single and double stub methods from the view points of easy implementation and wide tuning range, respectively. This impedance tuner consists of ten switches and its $2^{10}$ tuning points are distributed uniformly on the whole Smith chart. The measured maximum magnitude of the reflection coefficient is 0.9. And the fabricated impedance tuner has a wide bandwidth from 1.8 to 2.2 GHz. Using this impedance tuner, we did a load-pull measurement of a power transistor.
Keywords
Impedance Tuner; Load-Pull;
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