Title :
Full wave modeling of conducting posts in rectangular waveguides and its applications to slot coupled combline filters
Author :
Yao, Wui-Wen ; Zaki, Kawthar A. ; Atia, Ali E. ; Hershtig, Rafi
Author_Institution :
Dept. of Electr. Eng., Maryland Univ., College Park, MD, USA
fDate :
12/1/1995 12:00:00 AM
Abstract :
A full wave model of conducting posts in rectangular waveguides yielding their generalized S-matrix is presented. By cascading the generalized scattering matrices of the posts and waveguide discontinuities, slot couplings between two combline resonators are obtained. The validation and accuracy of the method are confirmed by comparing the numerical results with measured data. It is shown that both electric and magnetic couplings can be obtained by changing the slot positions, and the electric coupling is more sensitive to the tuning screw than magnetic coupling. A 6-pole slot coupled combline filter with asymmetrical transmission zeros is designed and built. Excellent filter responses are obtained
Keywords :
S-matrix theory; rectangular waveguides; resonator filters; slot line components; waveguide discontinuities; waveguide filters; waveguide theory; S-matrix; conducting posts; electric coupling; full wave model; magnetic coupling; rectangular waveguides; resonators; slot coupled combline filters; tuning screw; waveguide discontinuities; Convergence of numerical methods; Couplings; Rectangular waveguides; Resonant frequency; Resonator filters; Scattering; Tellurium; Termination of employment; Transmission line matrix methods; Waveguide discontinuities;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
