@article{3037309,
    title = "Optimized 90°polarization shift step twists for Ku, K and Ka bands",
    author = "Salis, V.G. and Mallios, S.A. and Tigelis, I.G. and Theodorou, A.S.",
    journal = "International Journal of Infrared and Millimeter Waves",
    year = "2007",
    volume = "28",
    number = "4",
    pages = "291-298",
    issn = "0195-9271, 1572-9559",
    doi = "10.1007/s10762-007-9209-9",
    keywords = "Broadband twists;  Rectangular waveguide twists;  Waveguide discontinuities, Computer simulation;  Electromagnetic wave polarization;  Frequency bands;  Mathematical models;  Microwave devices;  Rectangular waveguides, Phase shift",
    abstract = "Optimized models for 90°polarization shift step twists for Ku, K and Ka bands are presented. The cross-section of the waveguide employed is similar to that of a rectangular one, with the difference that the walls of the shorter side are part of a circular one with the proper diameter. The optimized models have been found using the CST Microwave Studio simulation tool and in all cases the return loss is kept below -20 dB for a wide range of frequency spectrum. Two examples are given, one for Ku band and the other for K and Ka ones. © Springer Science+Business Media, LLC 2007."
}