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Kasparek, W; Fernandez, A.; Hollmann, F; Wacker, R. |
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Measurements of ohmic losses of metallic reflectors at 140 GHz using a 3-mirror resonator technique |
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2001 |
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Int. J. Infrared and Millimeter Waves |
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22 |
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11 |
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1695-1707 |
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mirror, reflection index, emissivity, Fabry-Perot interferometer, subterahertz, subTHz |
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Abstract |
The reflectivity of metallic mirrors in the millimeter wave region does not only depend on the material, but also on the structure and roughness of the surface. We have performed measurements of the reflectivity of various plane and grooved metallic and graphite samples at 140 GHz. The technique is based on the comparison of the quality factor of a 2-mirror reference resonator with the quality factor of a 3-mirror resonator which has identical dimensions and includes the mirror to be tested. After a brief presentation of the theory, the set-up is described and the reflection loss for various aluminium and copper mirrors as well as vacuum compatible materials for applications in thermonuclear fusion experiments are presented and discussed. |
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581 |
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van't Klooster, K.; Myasnikova, S. E.; Parshin, V. V.; Kasparek, W. |
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Title |
Results of reflection loss measurements of sample material for radio astronomy telescope antenna for Planck Project |
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Conference Article |
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2004 |
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Proc. 14th international crimean conference on microwave and telecommunication technology |
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753-755 |
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mirror, reflection index, emissivity, Fabry-Perot interferometer, space observatory, terahertz, THz |
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Advanced radio telescope antennas for space applications are realised by the use of stable composite materials, which are lighter in general than various metal realisations. Reflectivity measurements have been carried out on high technology samples for the Planck radio telescope. Highly accurate results have been obtained at the Applied Physics Institute in Nizhny Novgorod, and an independent measurement with a totally different setup at the University of Stuttgart confirmed that one of the samples showed a strange behaviour. Moreover, it confirmed the high accuracy of the testing method. |
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