Improved steering of an antenna beam

A method for configuring an antenna feed arrangement, the method comprising:

• providing an antenna port;
• providing a waveguide port;
• and
• providing a reconfigurable waveguide arrangement connecting the antenna port and the waveguide port;
• wherein the method further comprises:
• providing a fixed part that comprises the waveguide port, the fixed part having a fixed position in the feed arrangement;
• providing a movable part that in turn comprises the antenna port, where the movable part is movable relative the fixed part by means of pairs of variable adjacent surfaces that are adapted to move relative each other;
• and
• configuring one surface in at least one pair of variable adjacent surfaces such that it at least partly comprises a conductive material with a periodic or quasi-periodic structure formed by a number of protruding elements arranged or designed to stop propagation of microwave energy to pass across a gap between the variable adjacent surfaces in at least one direction, at least in one intended frequency band of operation.