A compact semi-lumped tunable complex-impedance transformer-Reference-Cited by-同舟云学术

A compact semi-lumped tunable complex-impedance transformer

Published:2009-09-08 Issue:5 Volume:1 Page:403-413
ISSN:1759-0787
Container-title:International Journal of Microwave and Wireless Technologies
language:en
Short-container-title:Int. J. Microw. Wireless Technol.

Author:

Perrier Anne-Laure,Duchamp Jean-Marc,Exshaw Olivier,Harrison Robert,Ferrari Philippe

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.

Publisher

Cambridge University Press (CUP)

Subject

Electrical and Electronic Engineering

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