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Design of an ultra compact electronically tunable microwave impedance transformer

Design of an ultra compact electronically tunable microwave impedance transformer

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A novel ultra compact microwave tuneable impedance transformer topology is proposed. It consists of a classical π 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.


    1. 1)
      • Sinsky, J.H., Westgate, C.R.: `Design of an electronically tunable microwave impedance transformer', IEEE Int. Microw. Symp. Dig. MTT-S, June 1997, 2, p. 647–650.
    2. 2)
      • Perrier, A.-L., Ferrari, P., Duchamp, J.-M., Vincent, D.: `A varactor tunable complex impedance transformer', 34thEur. Microw. Conf. EuMC'04, 25–27 Oct. 2004, Amsterdam.
    3. 3)
      • ANSOFT Designer, ANSOFT Corporate, 225 West Station Square Drive Suite 200, Pittsburgh, PA 15219, USA.

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