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A Compact Semi-Lumped Tunable Complex Impedance Transformer

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 Ω to 90 Ω at 0.8 GHz and from 30 Ω 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.
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https://hal.archives-ouvertes.fr/hal-00599015
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Submitted on : Friday, June 22, 2018 - 11:24:38 AM
Last modification on : Thursday, November 19, 2020 - 1:00:46 PM
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A.L. Perrier, J.M. Duchamp, O. Exshaw, Robert Harrison, P. Ferrari. A Compact Semi-Lumped Tunable Complex Impedance Transformer. International Journal of Microwave and Wireless Technologies, Cambridge University Press/European Microwave Association 2009, 1 (5), pp.403-413. ⟨hal-00599015⟩

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