ISSTT Proceedings

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A Novel Type of Phase Grating for THz Beam Multiplexing

Authors:
Urs U. Graf, Stefan Heyminck
Abstract:
Phase gratings have become popular as local oscillator beam multiplexers for array receivers in the submillimeter wavelength domain. In general, binary or multilevel gratings, also known as Dammann gratings, are used. Dammann gratings can be designed and manufactured easily and perform satisfactorily for most one-dimensional applications. Two-dimensional dispersion, howeVer, is much more difficult to achieve. This is mainly due to the fact that a two-dimensional multilevel structure can not be machined easily. We introduce a new type of phase grating, the Fourier grating, which replaces the sharp edges of the multilevel gratings by a smooth grating structure. These gratings can be machined easily with standard machine shop equipment. The grating relatively simple and the diffraction efficiency is usually significantly higher than the efficiency of Dammann gratings. Typical efficiencies for two-dimensional gratings are above 80%. For one-dimensional dispersion, efficiencies beyond 90% are typical.
Categories:
Antennas & Telescopes, Quasi Optics
Year:
2000
Session:
11
Full-text:
Download a PDF of this paper.
Page Number(s):
599-606