Transmitter-receiver system in a satelite

Claim 2

A transmitter-receiver system as a link In a satelite containing an omnidirectional circularly polarised aerial or antenna (AN), an adaptor unit (BL) for feeding the antenna elements with signals of suitable phase (0°, 90°, 180 0 , 270 0 ), a directional switch device (RK) for passing mutually phase-shifted signals (0°, 90°) to the adaptor device (BL), and a transmitter-receiver part (SM1, SM2) for processing the signals received or transmitted by the antenna (AN), characterized in that the antenna (AN) is an octofilar helix antenna having four forwards twisted (t16,t27,t38,t45) and four backwards twisted (t18,t25,t36,t47) antenna elements for obtaining good lobe coverage with both right (RHC) and left polarised (LHC) signals.

Claim 3

System as claimed in claim 1, characterized in that the antenna (AN) comprises two pairs of crossed arms (al-a4 and a5-a8) at given mutual spacing (d), and located so that the end points of the arms of each pair are placed substantially opposite each other, the antenna element comprising wires (t16-t47) arranged such that from the end points of one arm pair (al-a4) a first wire (for example t16) runs from an end point (for example kl) to the end point (for example k6) of the other arm pair (a5-a8), the end point (k6), being situated opposite the nearest preceeding end point (k2), and a second wire (for example t18) runs from the first-mentioned end point (kl) to the end point (k8) of the other arm pair (a5-a8), such that this end point is nearest following after the end point (kl).