Improving the characteristics of rectangular waveguide branchings by cylindrical obstacles
Abstract
The scattering matrix of a transition between one or two parallel rectangular waveguides and a larger rectangular waveguide which contains two metallic or dielectric cylinders is investigated by means of the orthogonal expansion method. Mathematical programming is applied in order to improve the characteristics of the branchings. Reflection at a rectangular step discontinuity can be reduced by 30 dB using metallic or dielectric obstacles. Using Teflon cylinders, coupling of a transition can be reduced by 40 dB without debasing reflection. Physical interpretations are given with the help of field patterns.
 Publication:

IEEE Transactions on Microwave Theory Techniques
 Pub Date:
 October 1989
 DOI:
 10.1109/22.41007
 Bibcode:
 1989ITMTT..37.1597G
 Keywords:

 Dielectrics;
 Lossy Media;
 Mathematical Programming;
 Rectangular Waveguides;
 S Matrix Theory;
 Barriers;
 Cylinders;
 Magnetic Field Configurations;
 Optimization;
 Teflon (Trademark);
 Electronics and Electrical Engineering