ISSTT Proceedings

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Array-Receiver LO Unit using collimating Fourier-Gratings

Authors:
S. Heyminck, U.U.Graf
Abstract:
The local oscillator (LO) unit in our 490/810GHz array receiver needs to transform a divergent beam coming from a horn antenna into an array of well collimated beams. Based on our development of reflective phase gratings (Fourier gratings) we designed a compact LO unit using newly developed collimating gratings. Using planar gratings, the LO source had to be reimaged to form a plane wave at the location of the grating. The new collimating Fourier grating is matched to the wave front curvature of the divergent beam and does not require an additional collimating element. Because of the smooth grating structure it is possible to produce the collimating Fourier gratings on a commercial numerically controlled milling machine. We present the design of the grating and the entire LO unit combined with first measurements.
Categories:
Receivers
Year:
2001
Session:
13
Full-text:
Download a PDF of this paper.
Page Number(s):
563-570