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A new type of twist polariser that has a frequency selective property is investigated. The polariser consists of two sheets of photoetched dipole array FSSs (frequency selective surfaces), spaced about one-quarter wavelength apart. Such a polariser reflects waves at the desired frequency band in the usual manner, but lets the other frequency waves pass through.<<ETX>>
The statistics are presented of the rain attenuation during two years of measurement on a 30 GHz terrestrial link in Italy. The annual and 'worst month' distributions are analysed together with the statistics of the durations. A 'worst hour' effect during the delay is also observed and discussed.<<ETX>>
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