Computer Program for Electromagnetic Penetration into a Conducting Circular Cylinder through a Narrow Slot, TM Case.
Abstract
A computer program is described and listed. This program calculates electromagnetic penetration of a TM plane wave into the cylindrical cavity for which rho < or = a when the surface (rho = a, phi sub O < n = phi < or = 2 pi - rho sub O) is perfectly conducting. Here, rho and phi are cylindrical coordinates. The z directed electric field E sub z in the slot aperture (rho = a, - phi sub < or = phi < n = phi sub O) is expressed as a linear combination of 4 even and 4 odd expansion functions. The method of moments is used to obtain the coefficients of these functions. The elements of the moment matrix are obtained by expressing each expansion function as a Fourier series in phi valid for (0 < or = phi < or = 2 pi). Our moment solution remains accurate when the cavity becomes resonant because alternative expansion functions were chosen to prevent the moment matrix from becoming ill-behaved. As the aperture width 2 phi sub O decreases, more and more terms in the Fourier series are needed. Thanks to Debye's asymptotic expansions for Bessel functions, we are able to handle 10,000 terms so as to obtain accurate results for phi sub O as small as 1.25 deg. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 01, 1987
- Accession Number
- ADA178616
Entities
People
- Joseph R. Mautz
- Roger F. Harrington
Organizations
- Syracuse University