Antenna feed system for double polarization

An antenna feed system for double polarization in two respective high-frequency bands of different frequency position, consisting of a polarization shunt (PW) with a connecting flange (1) in common on the antenna side for both frequency bands and two directional connections (SV) (see FIG. 4) respectively allocated to one polarization direction for a respective frequency shunt (FW) whose connection (=SV) in common for the two frequency bands is respectively connected to one of the directional connections (SV) of the polarization shunt (PW), consisting of a first three decibel directional coupler (RK2) (FIG. 2) for the lower frequency band whose double axis is respectively connected to one further connection of both frequency shunts (FW) allocated to the lower frequency band, and consisting of a three decibel directional coupler (RK1) for the upper frequency band which is respectively connected to one further connection of the frequency shunts (FW) allocated to the upper frequency band characterized in that the polarization shunt (PW) is constructed phase-symmetrical with respect to its pass-through paths, in that the directional connections (SV) of the polarization shunt are connected directly to the frequency shunts (FW) or respectively are connected via two 45.degree. twisted pieces of different twisting direction which are precisely constructionally symmetrical, and in that the connecting lines between the frequency shunts (FW) and the three decibel directional couplers (RK1, RK2, 20, 20') for respectively two frequency bands of the same frequency range, said frequency bands existing in dual polarization directions, are constructed at the respectively same line location as phase-symmetrical line pairs with connection elements which coincide by pairs.

Antenna feed system for double polarization in two high-frequency bands of differing frequency position, comprising a polarization shunt with a connection in common on the antenna side for both frequency bands and two directional connections respectively allocated to one polarization direction for a respective frequency shunt, two frequency filters whose connection is common to said two frequency bands, is in each case connected to one of said directional connections of said polarization shunt, a first 3-dB directional coupler for the lower of said frequency bands whose double access is in each case connected to a further terminal, assigned to the lower frequency band of said two frequency filters, and further consisting of a 3-dB directional coupler for said upper frequency band which is connected to a further terminal, assigned to said upper frequency band of said frequency filters, said polarization shunt being constructed to be phase-symmetrical with respect to its transit paths, the directional terminals of said polarization shunt being connected directly or via two exactly structurally symmetrical 45.degree. twisted components of differing twisting direction, to said frequency filters, said connection lines between said frequency filters and said 3-dB directional couplers in each case for said two frequency bands, occupying dual polarization directions of the same frequency range, are constructed as phase-symmetrical pairs of lines with connection elements which match one another in pairs at the same point of said line.