Propagation Through Wire-Loaded Cascaded Rectangular Cavities Connected by Narrow Slots
CLEMSON UNIV SC DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
Pagination or Media Count:
A theoretical and experimental study of signal propagation through a series of cascaded rectangular cavities connected by walls containing narrow slots and with thin-wire probesposts inside the cavities is presented. Coupled integral equations are formulated in terms of the electric current on the probes and the equivalent magnetic current in the slots and a numerical solution technique based on the moment method is used to solve them. The Ewald method is employed to accelerate the convergence of the free-space periodic Greens function appearing in the kernel of the integral equations. The Ewald splitting parameter is determined using a special method D. Jackson, private communication which allows for good accuracy in the summations over a wide band of frequencies. The need to further speed up the computation led to the usage of matrix interpolation techniques wherein matrix elements are computed by direct means at only a few frequencies and then interpolated at many interior frequencies. Numerical results for the input impedance of the probe and shielding effectiveness are presented for various values of cavity parameters. The shielding effectiveness, a means of determining the influence of the transmission path and environment on the shape and magnitude of a transient exciting signal, is evaluated. It is hoped that this study will shed additional light on how the transmission path affects the characteristics of a signal which enters a complex electronic environment and reaches an interior point deep inside where a digital circuit may be located.
- Electricity and Magnetism
- Radiofrequency Wave Propagation