A DEVICE FOR FEEDING MULTIMODE MONOPULSE SIGNALS FROM ANTENNAS FOR TRACKING SATELLITES

摘要

The device for feeding multimode monopulse signals from antennas for tracking satellites comprises: (i) a single antenna (A) having reflector (R), subreflector (S) and horn (H); and (II) a feeder (B) of multimode monopulse signals, containing a smooth-walled cylindrical waveguide (C) connected co-axially to antenna reflector (R) at one end, and at the other end to a cylindrical waveguide (D) having a tapered end which is co-axially connected to another cylindrical waveguide (E) of diameter equal to that of the said tapered end to allow passage of the signals of dominant mode only. Two pairs of longitudinal slots are milled on the wall waveguide (C) for decoupling signals of higher modes only. The slots of each pair are disposed in diametrically opposite positions and at angular displacement of 45° between the two pairs of slots with respect to the axis of the waveguide. The axial separation between the two pairs of slots is half the waveguide wavelength of the signals propagated.