Design of an ultra compact electronically tunable microwave impedance transformer

A. Jrad (1) , A.-L. Perrier (2) , R. Bourtoutian (1) , J.-M. Duchamp (3) , Philippe Ferrari (4)

1 LU / ULB - الجامعة اللبنانية [بيروت] = Lebanese University [Beirut] = Université libanaise [Beyrouth]
2 RMN et optique : De la mesure au biomarqueur
3 IMEP - Institut de Microélectronique, Electromagnétisme et Photonique
4 École Nationale Supérieure d'Électronique et de Radioélectricité de Grenoble (ENSERG)

A novel ultra compact microwave tuneable impedance transformer topology is proposed. It consists of a classical /spl pi/ CLC network where an equivalent tuneable inductance is realised with a high impedance transmission line in series with fixed inductance and a diode's varactors. The realised hybrid prototype at 900 MHz operating frequency is only 0.06λ-long. Impedance loads from 16.5 to 280 Ω can be matched with a return loss better than -20 dB, and the relative bandwidth equals ±36% for a fixed 50 Ω load.

Domaines: Electronique

A. Jrad, A.-L. Perrier, R. Bourtoutian, J.-M. Duchamp, Philippe Ferrari. Design of an ultra compact electronically tunable microwave impedance transformer. Electronics Letters, 2005, 41 (12), pp.707-709. ⟨10.1049/el:20050689⟩. ⟨hal-01814633⟩