Off-Bragg Blazed Rectangular Groove Gratings for High Diffraction Efficiency Devices

• Published in: IEEE transactions on antennas and propagation Vol. 61; no. 4; pp. 2342 - 2347
• Main Authors: Chen, W., Beaulieu, N. C., Michelson, D. G., Jull, E. V.
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01.04.2013; Institute of Electrical and Electronics Engineers
• Subjects: Antennas; Applied classical electromagnetism; Applied sciences; Bragg scattering; demultiplexing; Diffraction, scattering, reflection; electromagnetic scattering by periodic structures; Electromagnetic wave propagation, radiowave propagation; Electromagnetism; electron and ion optics; Exact sciences and technology; frequency selective surfaces; Fundamental areas of phenomenology (including applications); gratings; microwave devices; millimeter wave antennas; multiplexing; periodic structures; Physics; Radiocommunications; Radiowave propagation; Telecommunications; Telecommunications and information theory; Performance evaluation; Multiplexing; Frequency selective surfaces; Microwave device; electromagnetic scattering by periodic structures; Multiplexer; Bragg grating; Periodic structure; gratings; Electromagnetic wave scattering; Bragg scattering; periodic structures; Scanning antenna; Reflection grating; Mode matching method; Conducting body; Demultiplexing; microwave devices; Electromagnetic wave propagation; Blazed grating; Wave scattering; Groove; Acoustic arrays; High frequency; Millimeter wave antennas; Demultiplexer
• ISSN: 0018-926X; 1558-2221
• DOI: 10.1109/TAP.2013.2241715

Off-Bragg blazing of gratings for high efficiency frequency scanning antennas, multiplexers and demultiplexers, is described. Blaze angles occur in pairs and are related by a generalization of the Bragg condition applicable to all grating profiles. Off-Bragg blazing for TM polarization occurs for several perfectly conducting grating profiles, perhaps for all, as indicated by extensive numerical computations using a rigorous mode matching method on a perfectly conducting rectangular groove reflection grating. Design curves for groove dimensions which have high diffraction efficiencies and wide deviations with relatively shallow grooves are given.