Journal
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
Volume 66, Issue 4, Pages 1874-1884Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TMTT.2018.2791952
Keywords
Impedance matching; microwave circuits; nonuniform transmission lines; planar circuits; waveguides
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Funding
- MINECO (Spanish Government) [TEC2016-75934-C4-1-R]
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For the practical implementation of RF and microwave impedance matching networks, a widely employed solution-alternative to the use of classical impedance transformers-is based on tapered lines. This paper shows a simple method to design smooth tapers that take into account the dispersion of the line and the required design bandwidth simultaneously. A planar taper has been designed in microstrip technology with the same length of classical ones but improving their performances. A waveguide prototype has also been designed with similar performance to a commercial one but with one third of its length. Both tapered structures have been obtained through the optimization of very few parameters using the same design strategy. As a result, the reflection coefficient of the tapers can be optimally adapted to a given specific mask using the prescribed value of physical length. Experimental results for both tapers are included for the validation of the proposed topologies and the related design method.
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