Title :
On the realizability of the impedance matrix for lossy dielectric posts in a rectangular waveguide
Author :
Hsu, Chung-I G. ; Auda, Hesham A.
Author_Institution :
Dept. of Electr. Eng., Mississippi Univ., University, MS, USA
fDate :
4/1/1988 12:00:00 AM
Abstract :
The equivalent T-network for some lossy dielectric posts in a rectangular waveguide is found to have a negative resistance in the parallel arm although the realizability conditions for the impedance matrix are strictly satisfied. Furthermore, the reactive part of the same impedance is found to be a monotonically decreasing function of frequency. These difficulties are overcome in the case of symmetrical post structures by using lattice networks. A simplified lattice network of lumped elements is developed to approximately realize the impedance matrix for resonant lossy post structures in the bandwidth.<>
Keywords :
electric impedance; equivalent circuits; rectangular waveguides; waveguide theory; equivalent network; impedance matrix; lattice networks; lossy dielectric posts; lumped elements; rectangular waveguide; symmetrical post structures; Bandwidth; Dielectric losses; Frequency; Impedance; Intelligent networks; Lattices; Rectangular waveguides; Resonance; Symmetric matrices; Transmission line matrix methods;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
