Frequency-scanned gratings consisting of photo-etched arrays

Author

Johansson, F. Stefan

Author_Institution

Div. of Network Theory, Chalmers Univ. of Technol., Gothenburg, Sweden

Volume

37

Issue

8

fYear

1989

fDate

8/1/1989 12:00:00 AM

Firstpage

996

Lastpage

1002

Abstract

Frequency-scanned gratings consisting of periodic arrays of thin conducting elements are investigated. The principle used is to let the first higher-order diffracted wave propagate and serve as the frequency-scanned beam. The grating structures are designed for optimum blazing to the desired diffracted wave (i.e., for optimal power conversion from the incident wave to the diffracted wave) by the use of an iterative optimization process. Both reflection and transmission gratings are considered; the elements investigated are single dipoles and crossed dipoles. The theoretical analysis is based on Floquet´s theorem and the method of moments. Several numerical examples are presented showing that this type of grating structure has a high blazing efficiency and is suitable for frequency scanning. The theoretical results are verified by comparison with experimental results

Keywords

antenna accessories; antenna theory; diffraction gratings; microwave antennas; Floquet´s theorem; crossed dipoles; frequency reflective surfaces; frequency scanned gratings; higher-order diffracted wave; iterative optimization process; method of moments; microwave antennas; optimum blazing; periodic arrays; photo-etched arrays; reflection gratings; single dipoles; thin conducting elements; transmission gratings; Design optimization; Diffraction gratings; Electromagnetic diffraction; Electromagnetic scattering; Frequency selective surfaces; Microwave antenna arrays; Optical reflection; Optical surface waves; Polarization; Power conversion;

fLanguage

English

Journal_Title

Antennas and Propagation, IEEE Transactions on

Publisher

ieee

ISSN

0018-926X

Type

jour

DOI

10.1109/8.34136

Filename

34136