Abstract
We propose a new topology based on a semi-lumped complex impedance transformer for the design of a frequency tunable three-port power divider. A prototype has been realized in a hybrid technology with commercially available varactor diodes. Our design is based on an impedance transformer in the input branch (with electrical length of 20.4deg), and a loop in the output branches (with electrical length of 2times24deg). This leads to a miniaturized device, more than two times shorter than a classical Wilkinson power divider. This divider can be tuned over plusmn30% around 1.35 GHz (from 0.95 GHz to 1.75 GHz) with insertion loss lower than 0.3 dB, return loss better than 20 dB and isolation between the two output ports better than 20 dB. Moreover, the low-pass behavior of the input impedance transformer leads to a good rejection of the second harmonic
Highlights
Tunable miniaturized devices constitute a great challenge in the field of modern RF/microwave telecommunications
Some researches are carried out to show the feasibility of various tunable devices that can be embedded in RF/microwave telecommunication systems like phase shifters, impedance transformers, filters, couplers, and power dividers
In this paper we show a new compact topology of power dividers having the same properties as Wilkinson power dividers
Summary
Tunable miniaturized devices constitute a great challenge in the field of modern RF/microwave telecommunications. More and more applications will use multiple operating frequencies, with hard miniaturization constraints for MMIC applications In this context, some researches are carried out to show the feasibility of various tunable devices that can be embedded in RF/microwave telecommunication systems like phase shifters, impedance transformers, filters, couplers, and power dividers. [5], [6] (iv) to eliminate the higher harmonics [7] All these researches are based on quarter-wave transmission lines, used as impedance transformers to transform a pure resistive load into another resistive load. In this paper we show a new compact topology of power dividers having the same properties as Wilkinson power dividers They are based on a complex impedance transformation. The design, simulation and measurement results obtained on a tunable power divider will be presented
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