Title :
Improving the characteristics of rectangular waveguide branchings by cylindrical obstacles
Author :
Gesche, Roland ; Russenschuck, Stephan
Author_Institution :
Leybold AG, Alzenau, West Germany
fDate :
10/1/1989 12:00:00 AM
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
Keywords :
S-matrix theory; mathematical programming; rectangular waveguides; waveguide theory; Teflon cylinders; cylindrical obstacles; dielectric cylinders; field patterns; mathematical programming; metallic cylinders; optimisation; orthogonal expansion method; parallel rectangular waveguides; rectangular step discontinuity; rectangular waveguide branchings; reflection-reduction; scattering matrix; Dielectrics; Equations; Mathematical programming; Rectangular waveguides; Reflection; Scattering; Tellurium; Transmission line matrix methods; Waveguide discontinuities; Waveguide transitions;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
