Title :
Coaxial probe modeling in waveguides and cavities
Author :
Liang, Ji-Fuh ; Chang, Hsin-Chin ; Zaki, Kawthar A.
Author_Institution :
Dept. of Electr. Eng., Maryland Univ., College Park, MD, USA
fDate :
12/1/1992 12:00:00 AM
Abstract :
Modeling, design, and sensitivity analysis of probe-excited cavities are presented. The three-cavity-moment method is used to obtain the two-port scattering matrix of the probe-excited semi-infinite waveguide while a novel equivalent circuit is introduced and used as a circuit model for the scattering matrix. A design procedure for probe-excited input/output cavities in waveguide filters is proposed, and a sensitivity analysis is carried out to show the effect of the probe´s dimensions on the electrical characteristics of the circuit. Agreement with experimental data is excellent for loosely coupled probe-excited semi-infinite waveguide problems. An example for a 15-GHz-thick iris filter verifies the validity of the proposed design
Keywords :
S-matrix theory; cavity resonators; equivalent circuits; microwave filters; modelling; passive filters; probes; sensitivity analysis; circuit model; coaxial probe modelling; design procedure; electrical characteristics; equivalent circuit; iris filter; probe-excited cavities; semi-infinite waveguide problems; sensitivity analysis; three-cavity-moment method; two-port scattering matrix; waveguide filters; Coaxial components; Coupling circuits; Electric variables; Equivalent circuits; Filters; Iris; Probes; Scattering; Sensitivity analysis; Transmission line matrix methods;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
