An integrated circuit comprising: a package; a phased antenna array comprising a plurality of antenna elements; and a die contained within the package; wherein the die comprises a plurality of unit cells, wherein each unit cell is divided into quadrants (11, 12, 13, 14), and each quadrant comprises: a receiver terminal located on a first axis of the quadrant; and a transmitter terminal located on a second axis of the quadrant, wherein the first axis is orthogonal to the second axis, wherein there is mirror symmetry between the nearest neighbour quadrants in the unit cell; wherein the package comprises: a plurality of pairs of feed lines, each pair of feed lines comprising a receiver feed line and a transmitter feed line, wherein the receiver feed line is connected to one of the receiver terminals and the transmitter feed line is connected to the transmitter terminal in the same quadrant of the die, wherein the receiver feed line is orthogonal to the transmitter feed line; and wherein each antenna element of the phased antenna array is coupled to a respective pair of feed lines (26, 28) to drive a receiver channel and a transmitter channel. a package; a phased antenna array comprising a plurality of antenna elements; and a die contained within the package; wherein the die comprises a plurality of unit cells, wherein each unit cell is divided into quadrants (11, 12, 13, 14), and each quadrant comprises: a receiver terminal located on a first axis of the quadrant; and a transmitter terminal located on a second axis of the quadrant, wherein the first axis is orthogonal to the second axis, wherein there is mirror symmetry between the nearest neighbour quadrants in the unit cell; wherein the package comprises: a plurality of pairs of feed lines, each pair of feed lines comprising a receiver feed line and a transmitter feed line, wherein the receiver feed line is connected to one of the receiver terminals and the transmitter feed line is connected to the transmitter terminal in the same quadrant of the die, wherein the receiver feed line is orthogonal to the transmitter feed line; and wherein each antenna element of the phased antenna array is coupled to a respective pair of feed lines (26, 28) to drive a receiver channel and a transmitter channel. wherein the die comprises a plurality of unit cells, wherein each unit cell is divided into quadrants (11, 12, 13, 14), and each quadrant comprises: a receiver terminal located on a first axis of the quadrant; and a transmitter terminal located on a second axis of the quadrant, wherein the first axis is orthogonal to the second axis, wherein there is mirror symmetry between the nearest neighbour quadrants in the unit cell; a receiver terminal located on a first axis of the quadrant; and a transmitter terminal located on a second axis of the quadrant, wherein the first axis is orthogonal to the second axis, wherein there is mirror symmetry between the nearest neighbour quadrants in the unit cell; wherein the package comprises: a plurality of pairs of feed lines, each pair of feed lines comprising a receiver feed line and a transmitter feed line, wherein the receiver feed line is connected to one of the receiver terminals and the transmitter feed line is connected to the transmitter terminal in the same quadrant of the die, wherein the receiver feed line is orthogonal to the transmitter feed line; and wherein each antenna element of the phased antenna array is coupled to a respective pair of feed lines (26, 28) to drive a receiver channel and a transmitter channel. a plurality of pairs of feed lines, each pair of feed lines comprising a receiver feed line and a transmitter feed line, wherein the receiver feed line is connected to one of the receiver terminals and the transmitter feed line is connected to the transmitter terminal in the same quadrant of the die, wherein the receiver feed line is orthogonal to the transmitter feed line; and wherein each antenna element of the phased antenna array is coupled to a respective pair of feed lines (26, 28) to drive a receiver channel and a transmitter channel.