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Proceedings Paper

Realisation Of Polarisation Sensitive And Frequency Selective Surfaces On Microwave Reflectors By Laser Evaporation
Author(s): R. Halm; Th. Kupper; A. Fischer
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Paper Abstract

Gridded reflectors are used on communication satellites antennas to provide frequency reuse in dual linear polarisation mode of operation. The polarisation sensitive surface consists of metallic strips, forming a grid with width and spacings of the order of 0.1 mm. The use of frequency-selective surface (FSS) subreflectors allows the simultaneous generation of different microwave beams with the same main reflector. Such a reflector will require a structure of conductive arrays of either dipoles, rings, squares or square loops with typical dimensions of the order of 3-6 mm. Optimisation of the electrical design leads to critical dimensioning of these structures. By direct ablation of an aluminium surface coating by means of laser evaporation, high accuracies can be achieved. The major requirements were to minimize thermal damage of the substrate material and to produce dimensionally accurate grids. Experiments were carried out using a pulsed TEA-CO2 laser and a Q-switched Alexandrite laser. Details of the experimental set-up and conditions are described.

Paper Details

Date Published: 11 January 1987
PDF: 7 pages
Proc. SPIE 0803, Micromachining of Elements with Optical and Other Submicrometer Dimensional and Surface Specifications, (11 January 1987); doi: 10.1117/12.941272
Show Author Affiliations
R. Halm, European Space Agency (The Netherlands)
Th. Kupper, Battelle Institut (West Germany)
A. Fischer, Battelle Institut (West Germany)

Published in SPIE Proceedings Vol. 0803:
Micromachining of Elements with Optical and Other Submicrometer Dimensional and Surface Specifications
Manfred Weck, Editor(s)

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