Rigorous Approach for Design of Differential Coupled-Line Directional Couplers Applicable in Integrated Circuits and Substrate-Embedded Networks.
We report rigorous approach for the design of differential coupled-line directional couplers in multilayer dielectric structures. In the proposed procedure numerically calculated per-unit-length parameters of coupled transmission lines are utilized for derivation of differential couplers' properties. The known description technique with multimode scattering parameters has been extended to the eight-ports considered in the paper and the properties resulting from symmetry of the considered networks have been shown. Exemplary 3-dB and 8-dB coupled-line directional couplers have been designed and experimentally evaluated. Nodal to mixed-mode conversion of scattering parameters has been applied to allow for measurements of the physically realized models. Results of measurements are shown to confirm the presented theoretical considerations.
AGH University of Science and Technology, Department of Electronics, Krakow, 30-059, Poland.
Kamil
K
Staszek
AGH University of Science and Technology, Department of Electronics, Krakow, 30-059, Poland.
Krzysztof
K
Wincza
AGH University of Science and Technology, Department of Electronics, Krakow, 30-059, Poland.
Slawomir
S
Gruszczynski