Millimeter wave beams diffracted from reflecting gratings |
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Authors: | Xiangdong Liu Hongwei Liu Kexu Yuan and Huiping Du |
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Institution: | (1) Department of Microwave Engineering, University of Electronic Science and Technology of China, Chengdu, People's Republic of China |
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Abstract: | According to the angular-spectrum method, a radiation beam of an antenna horn in the Fresnal region is decomposed into the plane waves with the fast Fourier transform algorithm and the waves diffracted from a reflection grating are superposed as a diffracted beam. Compared with the reflected beam from the same size mirror, the radiation half width of the diffracted beam from a grating is narrower and its lateral shape is shift. These performances have been experimentally verified at Ka-band by: (1). The relative diffraction efficiencies in the first order with two triangular gratings which is put along propagating direction of a beam produced by a conical lens-horn. (2). H-plane lateral width with power—3dB lapsed of the focus beam from a grating and a mirror in a grating spectrometer for millimeter waves (25–100 GHz). |
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Keywords: | Grating spectrometer Diffraction efficiency Resolving Power Lateral Shift |
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