A reflector antenna, comprising: • a feed for generating a radio frequency, RF, signal; and • a metasurface reflector for reflecting the RF signal originating from the feed, the metasurface reflector comprising an array of cells each having a volume of liquid crystal with a controllable dielectric value configured such that it enables a reflection phase of the cells to be selectively tuned to effect beam steering of the reflected RF signal, wherein the metasurface reflector comprises: ∘ first and second double sided substrates defining an intermediate region between them containing liquid crystal in a nematic phase; ∘ the first substrate having a first microstrip patch array formed on a side thereof that faces the second substrate, the first microstrip patch array comprising a two-dimensional array of microstrip patches each being electrically connected to a common potential; and ∘ the second double sided substrate having a second microstrip patch array formed on a side thereof that faces the first substrate, the second microstrip patch array comprising a two-dimensional array of microstrip patches each having a respective conductive terminal; the first microstrip patch array and the second microstrip patch array being aligned to form the array of cells, each cell comprising a microstrip patch of the first microstrip patch array arranged in spaced apart opposition to a microstrip patch of the second microstrip patch array with the volume of the liquid crystal located therebetween, the conductive terminal to the microstrip patch of the second microstrip patch array configured such that it permits a control voltage to be applied to the cell to control the dielectric value of the volume of the liquid crystal, thereby permitting the reflection phase of the cell to be selectively tuned, ∘ wherein the metasurface reflector comprises a gridded wire mesh on the first substrate, each of the microstrip patches of the first microstrip patch array being electrically connected to a respective point of the gridded wire mesh to provide the common potential. • a feed for generating a radio frequency, RF, signal; and • a metasurface reflector for reflecting the RF signal originating from the feed, the metasurface reflector comprising an array of cells each having a volume of liquid crystal with a controllable dielectric value configured such that it enables a reflection phase of the cells to be selectively tuned to effect beam steering of the reflected RF signal, ∘ first and second double sided substrates defining an intermediate region between them containing liquid crystal in a nematic phase; ∘ the first substrate having a first microstrip patch array formed on a side thereof that faces the second substrate, the first microstrip patch array comprising a two-dimensional array of microstrip patches each being electrically connected to a common potential; and ∘ the second double sided substrate having a second microstrip patch array formed on a side thereof that faces the first substrate, the second microstrip patch array comprising a two-dimensional array of microstrip patches each having a respective conductive terminal; the first microstrip patch array and the second microstrip patch array being aligned to form the array of cells, each cell comprising a microstrip patch of the first microstrip patch array arranged in spaced apart opposition to a microstrip patch of the second microstrip patch array with the volume of the liquid crystal located therebetween, the conductive terminal to the microstrip patch of the second microstrip patch array configured such that it permits a control voltage to be applied to the cell to control the dielectric value of the volume of the liquid crystal, thereby permitting the reflection phase of the cell to be selectively tuned, ∘ wherein the metasurface reflector comprises a gridded wire mesh on the first substrate, each of the microstrip patches of the first microstrip patch array being electrically connected to a respective point of the gridded wire mesh to provide the common potential.