The reduction of interference from large reflecting surfaces

Author

Jull, Edward V. ; Ebbeson, Gordon R.

Author_Institution

Univ. of British Columbia, Vancouver, BC, Canada

Volume

25

Issue

4

fYear

1977

fDate

7/1/1977 12:00:00 AM

Firstpage

565

Lastpage

570

Abstract

The use of corrugated surfaces to reduce interfering reflections from buildings, in particular instrument landing system (ILS) interference from hangars near airport runways, is proposed. A numerical examination of the infinite comb grating under $H$ -polarized plane wave illumination with grating spacing $\\lambda /2 < a < \\lambda$ is made. As with all periodic surfaces investigated, specular reflection can by completely converted to backscatter in the direction of incidence $\\theta_{i}$ from the surface normal when $\\theta_{i} = \\sin^{-1} (\\lambda /2a)$ and the corrugation depth is properly chosen. Model measurements at 35 GHz on finned surfaces of finite size under nonplane wave illumination verify the surfaces behave essentially as predicted for the infinite comb. The surfaces retain this behavior for frequencies within the ILS range and angles of oblique incidence less than about $10\\deg$ . Practical considerations in implementing these ideas are mentioned.

Keywords

Aircraft landing guidance; Electromagnetic (EM) scattering by rough surfaces; Radio navigation terrain factors; Radio propagation terrain factors; Airports; Backscatter; Corrugated surfaces; Gratings; Instruments; Interference; Lighting; Predictive models; Reflection; Surface waves;

fLanguage

English

Journal_Title

Antennas and Propagation, IEEE Transactions on

Publisher

ieee

ISSN

0018-926X

Type

jour

DOI

10.1109/TAP.1977.1141640

Filename

1141640