Optimum Synthesis of Symmetrical Branch-Waveguide Directional Couplers
- 1 January 1987
- conference paper
- Published by Institute of Electrical and Electronics Engineers (IEEE)
- Vol. 1 (0149645X) , 357-360
- https://doi.org/10.1109/mwsym.1987.1132404
Abstract
An optimised synthesis procedure to design branch-waveguide directional couplers for satellite beam forming network applications is reported. This procedure allows to achieve a very significant improvement, particularly for the input reflection and isolation, also for couplers with few branches. A 5-branch 3 dB coupler, designed with the described method, has been manufactured in WR75 waveguide. Comparing scattering parameter measurements with the computed frequency performance shows that the synthesis procedure is verified very satisfactorily. Return loss and isolation values are 40 dB minimum on a 15% bandwidth. The computer package allows also to calculate the sensitivity of the electrical characteristics versus geometrical parameters and then enables to evaluate the tolerances required for the mechanical manufacturing. Moreover theoretical results of a 7-branch 3 dB coupler with wide frequency band (11.7-14.5 GHz) are presented.Keywords
This publication has 3 references indexed in Scilit:
- `` Direct Search'' Solution of Numerical and Statistical ProblemsJournal of the ACM, 1961
- The Multiple Branch Waveguide CouplerIEEE Transactions on Microwave Theory and Techniques, 1958
- A Method of Analysis of Symmetrical Four-Port NetworksIEEE Transactions on Microwave Theory and Techniques, 1956