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A compact semi-lumped tunable complex-impedance transformer
Published online by Cambridge University Press: 08 September 2009
Abstract
This article describes the design and performance of a compact tunable impedance transformer. The structure is based on a transmission line loaded by varactor diodes. Using only two pairs of diodes, the circuit is very small with a total length of only λ/10. Both the frequency range and the load impedance can be tuned by varying the varactor bias voltages. Our design provides a tunable operating frequency range of ±40% and an impedance match ranging from 20 to 90 Ω at 0.8 GHz and from 30 to 170 Ω at 1.5 GHz. In addition, a new approach that considers losses for the simulation and measurement of this impedance transformer was investigated. The measured performance of a 1 GHz prototype design confirmed the validity of this new approach.
- Type
- Original Article
- Information
- International Journal of Microwave and Wireless Technologies , Volume 1 , Issue 5 , October 2009 , pp. 403 - 413
- Copyright
- Copyright © Cambridge University Press and the European Microwave Association 2009
References
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