A metasurface for reflecting an incident wave to effect beam steering, the metasurface comprising: 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 a two dimensional 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 a volume of the liquid crystal located therebetween, the conductive terminal to the microstrip patch of the second microstrip patch array permitting a control voltage to be applied to the cell to control a dielectric value of the volume of the liquid crystal, thereby permitting a reflection phase of the cell to be selectively tuned; and the metasurface is characterized in further comprising 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. 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 a two dimensional 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 a volume of the liquid crystal located therebetween, the conductive terminal to the microstrip patch of the second microstrip patch array permitting a control voltage to be applied to the cell to control a dielectric value of the volume of the liquid crystal, thereby permitting a reflection phase of the cell to be selectively tuned; and the metasurface is characterized in further comprising 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. <EOS>