Accession Number:

AD0250931

Title:

A Note on Waveguide Image Techniques

Descriptive Note:

[Technical Report, Technical Report]

Corporate Author:

CASE INST OF TECH CLEVELAND OH

Personal Author(s):

• Collin, R. E.

Report Date:

1960-11-30

Pagination or Media Count:

26

Abstract:

Floquets theorem and the reflection symmetry properties of Maxwells equations are used to establish the relationship between scattering by two dimensional periodic structures in free space and equivalent waveguide problems. For structures such as strip gratings, having periodicity in one direction only it is shown that the free space problem is equivalent to the sum of two waveguide problems and vice-versa. For structures with periodicity along two axis it is shown that four waveguide problems must be solved in order to determine the complete solution of the free space problem. Only when more than one basic cell of the periodic structure is contained within the waveguide walls will a single waveguide problem be equivalent to the free space problem as far as dominant mode fields are concerned.

Descriptors:

• two dimensional
• scattering
• air force
• angle of incidence
• electric fields
• coefficients
• magnetic fields
• reflection
• waveguides
• equations
• military research
• diffraction
• governments
• periodic variations
• amplitude
• buildings and structures

Subject Categories:

• Radiofrequency Wave Propagation

Distribution Statement:

[A, Approved For Public Release]