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A sophisticated setup to perform exact measurements of aperture antenna fields in the mm wave range has been built. This setup can be applied to compare different principles for generating rotating high order modes for cold test measurements and to investigate the behaviour of different improved quasi-optical mode converters.
J. Pretterebner
"Precise measurements of the fields of aperture-antennas launching high order modes", Proc. SPIE 1929, 17th International Conference on Infrared and Millimeter Waves, 19291Q (14 December 1992); https://doi.org/10.1117/12.2298179
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J. Pretterebner, "Precise measurements of the fields of aperture-antennas launching high order modes," Proc. SPIE 1929, 17th International Conference on Infrared and Millimeter Waves, 19291Q (14 December 1992); https://doi.org/10.1117/12.2298179