Premium
An asymptotic analysis of a wire mesh parallel‐plate waveguide
Author(s) -
Pasik M. F.,
Dudley D. G.
Publication year - 1994
Publication title -
radio science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.371
H-Index - 84
eISSN - 1944-799X
pISSN - 0048-6604
DOI - 10.1029/93rs03591
Subject(s) - waveguide , excitation , line source , physics , mathematical analysis , transient response , fast fourier transform , optics , exponential function , mathematics , acoustics , algorithm , electrical engineering , quantum mechanics , engineering
The method of steepest descents is applied to a parallel‐plate waveguide where one of the plates is a bonded wire mesh modeled by a sheet impedance boundary condition. The structure is excited by a magnetic line source exterior to the waveguide. The parameters of the wire mesh are adjusted to exploit the contributions from the leaky‐wave poles in the near far‐zone radiation pattern. The use of the asymptotic expressions in this region is justified by comparisons with results obtained by numerical integration. The transient response of the structure is obtained by transforming the frequency domain response to the time domain with an FFT algorithm. An alternate representation for the magnetic field which is computationally efficient for determining the response in early time is derived. Numerical results for a double exponential pulse excitation of the line source are presented.