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Theory of Doubly-Shielded Coupled Lines for Directional Couplers of Various Directivity Types with Impedance Transformation
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  • Aleksandr Sychev ,
  • Vladislav Bondar ,
  • Kezhik Dagba ,
  • Anton Stepanyuga ,
  • Nickolai Rudyi
Aleksandr Sychev
Tomsk State University of Control Systems and Radioelectronics (TUSUR)), Tomsk State University of Control Systems and Radioelectronics (TUSUR)), Tomsk State University of Control Systems and Radioelectronics (TUSUR))

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Vladislav Bondar
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Kezhik Dagba
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Anton Stepanyuga
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Nickolai Rudyi
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Abstract

Coupled lines with a double shielding in weakly and strongly inhomogeneous dielectric media are studied. They have specific properties that allow creation of impedance-transforming directional couplers with given directivity type. The proposed models and synthesis techniques takes into account both electric asymmetry and dielectric inhomogeneity. Numerical simulations and measurements prove the correctness of the general theory, and the possibility of creating co-, contra- and trans-directional couplers with impedance-transforming and phase-shifting properties. The results will be useful for finding new design solutions of advanced couplers and microwave circuits.
May 2023Published in IEEE Transactions on Microwave Theory and Techniques volume 71 issue 5 on pages 2104-2117. 10.1109/TMTT.2022.3227310