Reradiation from a grating coupler for a grounded dielectric slab waveguide

Author

Park, W.S. ; Seshadri, S.R.

Author_Institution

University of Wisconsin-Madison, Department of Electrical and Computer Engineering, Madison, USA

Volume

133

Issue

1

fYear

1986

fDate

2/1/1986 12:00:00 AM

Firstpage

10

Lastpage

17

Abstract

The reradiation characteristics of a grating coupler for a grounded dielectric slab waveguide are investigated for the transverse magnetic mode, taking into account the finite conductivity of the ground plane. A pair of canonical equations for the coupler are derived. Analyses based on the solution of the canonical equations show the effects of the finite conductivity on the minimum reradiation coefficient, the optimum modulation index of the grating, the optimum incident angle, and the sensitivity of the reradiation to the changes in the incident angle about the optimum value. The coupler with the grating on the conducting surface is compared with the coupler having the grating on the film-cover interface for both the transverse-magnetic and transverseelectric modes.

Keywords

dielectric waveguides; directional couplers; earthing; waveguide theory; canonical equations; conducting surface; conductivity; film-cover interface; grating coupler; grounded dielectric slab waveguide; incident angle; modulation index; reradiation characteristics; reradiation coefficient; sensitivity; transverse electric mode; transverse magnetic mode; waveguide theory;

fLanguage

English

Journal_Title

Microwaves, Antennas and Propagation, IEE Proceedings H

Publisher

iet

ISSN

0950-107X

Type

jour

DOI

10.1049/ip-h-2.1986.0002

Filename

4642867