Bandpass grids with annular apertures

Author

Roberts, Ann ; McPhedran, Ross C.

Author_Institution

Dept. of Theor. Phys., Sydney, NSW, Australia

Volume

36

Issue

5

fYear

1988

fDate

5/1/1988 12:00:00 AM

Firstpage

607

Lastpage

611

Abstract

A rigorous theory is developed for describing the diffraction of a plane wave by a doubly periodic array of annular apertures in a thick, perfectly conducting screen. Coaxial waveguide modes are used to describe the fields within each aperture, while the fields above and below the grid are written as plane wave expansions. Appropriate boundary conditions are applied at the upper and lower surfaces of the screen, and the method of moments is used to determine mode and wave amplitudes. Such a structure was found to exhibit excellent bandpass characteristics which can be adjusted by changing the size of the apertures and the thickness of the screen

Keywords

band-pass filters; boundary-value problems; diffraction gratings; electromagnetic wave diffraction; waveguide theory; annular apertures; bandpass characteristics; bandpass grid; boundary conditions; coaxial waveguide modes; doubly periodic array; method of moments; perfectly conducting screen; plane wave; plane wave expansions; thick screen; wave amplitudes; Apertures; Diffraction; Electromagnetic waveguides; Frequency; Interferometers; Polarization; Q factor; Refractive index; Resonance; Tellurium;

fLanguage

English

Journal_Title

Antennas and Propagation, IEEE Transactions on

Publisher

ieee

ISSN

0018-926X

Type

jour

DOI

10.1109/8.192136

Filename

192136