H - Electricity – 01 – P
Patent
H - Electricity
01
P
333/3
H01P 1/161 (2006.01) H01P 1/17 (2006.01) H01P 1/213 (2006.01)
Patent
CA 1157113
ABSTRACT OF THE DISCLOSURE A four-port network for separating signals comprised of two doubly polariz- ed frequency bands for an antenna feeder system in directional or satellite radio operation, wherein a first polarization converter for converting linear polarization to circular polarization, and vice versa, is designed for the lowest inherent ellipticity in the lower frequency band and is connected ahead of a symmetric polarization filter for the lower frequency band, and a second polarization converter which compensates the remaining ellipticity in the upper frequency band is connected between the symmetric- al polarization filter and a further polarization filter for the upper frequency band. The second polarization converter for compensating the remaining ellipticity in the upper frequency band has a square cross section; for reducing the frequency dependence of the remaining ellipticity but simultaneously increasing the amount of the remaining ellipticity two bevels are arranged in diagonally opposite corners of said square cross section and a dielectric plate disposed between two diagonally opposite corners of said square cross section has the resulting effect that the amount of the remain- ing ellipticity and additionally its frequency dependence are reduced to a minimum.
357981
Ant Nachrichtentechnik G.m.b.h.
Fetherstonhaugh & Co.
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