ISSTT Proceedings

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Tolerance Analysis of a 500 GHz Amplitude Hologram

Authors:
Taavi Hirvonen, Jussi Tuovinen, Antti Räisänen
Abstract:
The antenna of the Odin satellite is planned to be tested with a hologram type of a compact antenna test range (hologram CATR) at 119 GHz and 500 GHz. The quiet-zone field is analysed theoretically by using an exact near-field aperture integration method. Main focus of this paper is on the hologram pattern errors parallel to the surface of the hologram. Also the surface flatness requirement is discussed. Due to fabrication errors the slots of the hologram are wider or narrower than in an ideal case, which is shown as increased amplitude and phase ripple in the quiet-zone. Large holograms have to be fabricated by joining several pieces together. A possible displacement of the pieces causes an inclination to the amplitude an phase in the quiet-zone. Also the effect of a frequency change has been simulated; the effect is the inclination of the phase, i.e., the plane wave leaves the hologram in a different angle than at the design frequency.
Categories:
Antennas & Telescopes, Optics
Year:
1995
Session:
8
Full-text:
Download a PDF of this paper.
Page Number(s):
397-406