Abstract: We generally describe an antenna, in particular a parabolic antenna, comprising: a primary reflector, in particular a parabolic dish, a feed antenna and/or a secondary reflector for transmitting and/or reflecting an electromagnetic wave towards the primary reflector and/or receiving a said electromagnetic wave reflected from the primary reflector, a feed coupled to the feed antenna and/or secondary reflector, wherein the feed antenna and/or secondary reflector is coupleable, via the feed, to a radio-frequency transmission and/or reception device, and an actuator unit coupled to one or more of the feed antenna, the secondary reflector and the feed, wherein the actuator unit is configured to move the feed antenna and/or the secondary reflector, by exerting a mechanical force on the feed antenna and/or the secondary reflector and/or the feed, relative to the primary reflector.

Abstract: The present invention relates to a reflector antenna assembly, and a method of operating an antenna assembly wherein the reflector antenna assembly comprises a reflector having a focal region, wherein an aperture is present in a portion of the reflector; and a waveguide passing through the aperture, wherein the reflector antenna assembly is configured such that the reflector is operable to move relative to the waveguide.