FEEDER LINE OF AN ANTENNA WITH A DOUBLE FREQUENCY BAND AND DIFFERENT CIRCULAR POLARISATION IN EACH BAND

摘要

The invention relates to a feeder line of an antenna with a double frequency band and different circular polarisation in each band, with high electrical performances and a high level of versatility in the mechanical interconnection. The feeder is based on a novel architecture using a diplexer (200) which combines the two input signals (L1, L2) in different frequency bands and with the same linear polarisation in a waveguide, while providing increased isolation between the frequency bands. The output monomodal waveguide of the diplexer allows the signals to be routed in the most convenient manner without any geometrical restriction until they reach a biphase polariser (201) used to produce the required phase displacements, of approximately +90º and -90º, in each of the bands, in order to obtain the desired circular polarisations with a low level of axial relation in each frequency band.