U.R.S.I. Symposium 1980 on Electromagnetic Waves.
Abstract
L.B. Felsen of the Polytechnic Institute of New York discussed a hybrid-ray-mode field formulation in inhomogeneous media (Paper No. 111B). High-frequency fields radiated by sources in transversely inhomogeneous waveguides or ducts are usually analyzed in terms of a normal-mode expansion or by ray techniques. However, these techniques lead to computational difficulties for poorly convergent fields which involve an excessively large number of modes or rays, and corrections are required near the caustics and cusps of the ray system. Felsen suggested a hybrid formulation representation which utilizes an appropriately chosen mixture of modal fields and ray fields. The motivations are to achieve a fast convergence and therefore an ease of computation, to afford a better physical insight, and to avoid difficult transition regions where caustics and cusps accumulate. This hybrid representation has been applied to analyze high-frequency underwater sound propagation in ocean channels (Paper No. 121C by S.H. Cho and Felsen) and wave propagation in tropospheric ducts and along concave conducting surfaces.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 22, 1980
- Accession Number
- ADA093641
Entities
People
- David K. Cheng
- T. C. Cheston
Organizations
- Office of Naval Research