Title :
Frequency-scanned gratings consisting of photo-etched arrays
Author :
Johansson, F. Stefan
Author_Institution :
Div. of Network Theory, Chalmers Univ. of Technol., Gothenburg, Sweden
fDate :
8/1/1989 12:00:00 AM
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;
Journal_Title :
Antennas and Propagation, IEEE Transactions on
