Title :
Thru characteristics of a coaxial gap (FDTD model and measurements)
Author :
Colpitts, Bruce G.
Author_Institution :
Dept. of Electr. Eng., New Brunswick Univ., Fredericton, NB, Canada
fDate :
1/1/1996 12:00:00 AM
Abstract :
Thru characteristics of a coaxial cable interrupted by a small gap are modeled and measured. Finite-difference time-domain (FDTD) modeling is applied in cylindrical coordinates to semirigid coaxial cable and to the intervening gap material. Both dispersive and nondispersive gap materials are investigated. Gap loss and phase shift are accurately predicted by this two-dimensional model which accounts for TEM and TM modes in the gap and coaxial apertures. An application of the model is to establish reference data for thin sample permittivity or moisture measurements
Keywords :
coaxial cables; dispersion (wave); electromagnetic wave propagation; finite difference time-domain analysis; losses; microwave measurement; moisture measurement; permittivity measurement; FDTD model; TEM modes; TM modes; coaxial cable; coaxial gap; cylindrical coordinates; dispersive materials; finite-difference time-domain modeling; gap loss; gap material; moisture measurements; nondispersive materials; permittivity measurements; phase shift; semirigid coaxial cable; two-dimensional model; Apertures; Coaxial cables; Coaxial components; Conducting materials; Dielectric losses; Dispersion; Finite difference methods; Permittivity measurement; Reflection; Time domain analysis;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
