An antenna array (702, 704) comprising: a first and second plurality of unit cells respectively connected in series via respective transmission lines, each of the unit cells including a microstrip patch having two insets (632a, 632b) on a first axis of the microstrip patch, the microstrip patch being connected to a first and a second of the transmission lines at the two insets (632a, 632b), respectively; a first and second termination unit cell (400, 600) each connected in series to a corresponding one unit cell of the first and second plurality of unit cells (400, 600) via one of the transmission lines (440, 640), each termination unit cell (400, 600) including a microstrip patch (430, 630) having an inset (432, 632a, 632b) on a second axis (434, 650) of the microstrip patch (430, 630), the microstrip patch (430, 630) being connected to the one transmission line (440, 640) at the inset (432, 632a, 632b); the antenna array further comprising a first sub-array (721, 741) comprising the first plurality of unit cells and the first termination unit cell (400, 600) in a forward in-phase feed, a second sub-array (722, 742) comprising the second plurality of unit cells and the second termination unit (400, 600) cell in a backwards, out-of-phase feed, wherein the first sub-array (721, 741) and the second sub-array (722, 742) provide differential feeding to each unit cell of the first plurality of unit cells and the second plurality of unit cells via the first and second transmission lines, wherein the second plurality of unit cells are provided in a staggered arrangement at an offset relative to the first plurality of unit cells, wherein the microstrip patch of each of the unit cells further has a third inset and a fourth inset, the microstrip patch being connected to third and fourth transmission lines at the third inset and the fourth inset, respectively, whereas the third inset and the fourth inset are disposed on a third axis perpendicular to the first axis, and wherein the first plurality of unit cells is arranged linearly on a fourth axis parallel to a fifth axis on which there is linearly arranged the second plurality of the unit cells. a first and second plurality of unit cells respectively connected in series via respective transmission lines, each of the unit cells including a microstrip patch having two insets (632a, 632b) on a first axis of the microstrip patch, the microstrip patch being connected to a first and a second of the transmission lines at the two insets (632a, 632b), respectively; a first and second termination unit cell (400, 600) each connected in series to a corresponding one unit cell of the first and second plurality of unit cells (400, 600) via one of the transmission lines (440, 640), each termination unit cell (400, 600) including a microstrip patch (430, 630) having an inset (432, 632a, 632b) on a second axis (434, 650) of the microstrip patch (430, 630), the microstrip patch (430, 630) being connected to the one transmission line (440, 640) at the inset (432, 632a, 632b); the antenna array further comprising a first sub-array (721, 741) comprising the first plurality of unit cells and the first termination unit cell (400, 600) in a forward in-phase feed, a second sub-array (722, 742) comprising the second plurality of unit cells and the second termination unit (400, 600) cell in a backwards, out-of-phase feed, wherein the first sub-array (721, 741) and the second sub-array (722, 742) provide differential feeding to each unit cell of the first plurality of unit cells and the second plurality of unit cells via the first and second transmission lines, wherein the second plurality of unit cells are provided in a staggered arrangement at an offset relative to the first plurality of unit cells, wherein the microstrip patch of each of the unit cells further has a third inset and a fourth inset, the microstrip patch being connected to third and fourth transmission lines at the third inset and the fourth inset, respectively, whereas the third inset and the fourth inset are disposed on a third axis perpendicular to the first axis, and wherein the first plurality of unit cells is arranged linearly on a fourth axis parallel to a fifth axis on which there is linearly arranged the second plurality of the unit cells.