A radio frequency, RF, device, comprising: a radio frequency integrated circuit, RFIC, chip (200; 200a; 200b; 200c; 200'; 200"); and an antenna module (100; 100a; 100b; 100c; 60; 71; 82; 83; 100'; 100") on an upper surface of the RFIC chip (200; 200a; 200b; 200c; 200'; 200"), the antenna module comprises: a first patch (62; 82_1; 83_1; 101; 111) parallel to the RFIC chip (200; 200a; 200b; 200c; 200'; 200") and having an upper surface configured to emit radiation in a vertical direction opposite the first patch from the RFIC chip, a ground plate parallel to the first patch (62; 82_1; 83_1; 101; 111), and between the first patch and the RFIC chip (200; 200a; 200b; 200c; 200'; 200"), and a first plurality of feed lines (15; 15') connected to a lower surface of the first patch (62; 82_1; 83_1; 101; 111) and configured to supply a plurality of first differential signals to the first patch from the RFIC chip (200; 200a; 200b; 200c; 200'; 200"), wherein the first plurality of feed lines (15; 15') comprise a first feed line and a second feed line respectively connected to a first feed point and a second feed point on the lower surface of the first patch (62; 82_1; 83_1; 101; 111) and configured to supply one of the plurality of first differential signals to the first patch, and the first feed point and the second feed point are separated in a first horizontal direction, wherein the first plurality of feed lines (15; 15') further comprise a third feed line and a fourth feed line respectively connected to a third feed point and a fourth feed point on the lower surface of the first patch (62; 82_1; 83_1; 101; 111) and configured to supply another one of the plurality of first differential signals to the first patch (62; 82_1; 83_1; 101; 111), and the third feed point and the fourth feed point are separated in a second horizontal direction perpendicular to the first horizontal direction to achieve a dual polarization, and wherein the RFIC chip (200") comprises a plurality of phase shifters (221_2, 223_2) configured to generate the plurality of first differential signals. a radio frequency integrated circuit, RFIC, chip (200; 200a; 200b; 200c; 200'; 200"); and an antenna module (100; 100a; 100b; 100c; 60; 71; 82; 83; 100'; 100") on an upper surface of the RFIC chip (200; 200a; 200b; 200c; 200'; 200"), the antenna module comprises: a first patch (62; 82_1; 83_1; 101; 111) parallel to the RFIC chip (200; 200a; 200b; 200c; 200'; 200") and having an upper surface configured to emit radiation in a vertical direction opposite the first patch from the RFIC chip, a ground plate parallel to the first patch (62; 82_1; 83_1; 101; 111), and between the first patch and the RFIC chip (200; 200a; 200b; 200c; 200'; 200"), and a first patch (62; 82_1; 83_1; 101; 111) parallel to the RFIC chip (200; 200a; 200b; 200c; 200'; 200") and having an upper surface configured to emit radiation in a vertical direction opposite the first patch from the RFIC chip, a ground plate parallel to the first patch (62; 82_1; 83_1; 101; 111), and between the first patch and the RFIC chip (200; 200a; 200b; 200c; 200'; 200"), and a first plurality of feed lines (15; 15') connected to a lower surface of the first patch (62; 82_1; 83_1; 101; 111) and configured to supply a plurality of first differential signals to the first patch from the RFIC chip (200; 200a; 200b; 200c; 200'; 200"), wherein the first plurality of feed lines (15; 15') comprise a first feed line and a second feed line respectively connected to a first feed point and a second feed point on the lower surface of the first patch (62; 82_1; 83_1; 101; 111) and configured to supply one of the plurality of first differential signals to the first patch, and the first feed point and the second feed point are separated in a first horizontal direction, wherein the first plurality of feed lines (15; 15') further comprise a third feed line and a fourth feed line respectively connected to a third feed point and a fourth feed point on the lower surface of the first patch (62; 82_1; 83_1; 101; 111) and configured to supply another one of the plurality of first differential signals to the first patch (62; 82_1; 83_1; 101; 111), and the third feed point and the fourth feed point are separated in a second horizontal direction perpendicular to the first horizontal direction to achieve a dual polarization, and wherein the RFIC chip (200") comprises a plurality of phase shifters (221_2, 223_2) configured to generate the plurality of first differential signals.