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              <p>Une nouvelle topologie ultra compacte d'un transformateur d'impédance micro-onde est proposée. Il consiste en un circuit classique CLC en π où l'inductance variable équivalente L est réalisée à l'aide d'un tronçon de ligne haute impédance en série avec une inductance fixe et une diode Schottky polarisée en inverse jouant le rôle de varactor. Un prototype basé sur une technologie hybride a été réalisé pour une fréquence de fonctionnement de 900 MHz. La longueur de ce transformateur est égale à 0,06λ. Des impédances de charge allant de 16,5 Ω à 280 Ω peuvent être adaptées avec comme critère 11 S &amp;lt;-20 dB. Pour une impédance de charge de 50 Ω, une bande passante de ±36 % est obtenue autour de 900 MHz pour le même critère sur le module de S 11 .</p>
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